diff --git a/README.md b/README.md
index b50e024..9324e6c 100644
--- a/README.md
+++ b/README.md
@@ -20,11 +20,14 @@ This plugin **requires** the Twilio PHP SDK v8.7.0 to function. The plugin will
    ```
 
 3. **Configure Twilio Credentials** in WordPress admin:
-   - Account SID
-   - Auth Token  
-   - Phone Number
+   - Go to **Twilio** → **Settings**
+   - Enter Account SID and Auth Token
+   - Configure default phone numbers
 
-4. **Test the installation** with a sample call.
+4. **Set up Phone Numbers** in Twilio Console:
+   - Configure webhook URLs for voice and SMS
+   - Voice: `https://yoursite.com/wp-json/twilio-webhook/v1/voice`
+   - SMS: `https://yoursite.com/wp-json/twilio-webhook/v1/sms`
 
 ## Requirements
 
@@ -35,100 +38,328 @@ This plugin **requires** the Twilio PHP SDK v8.7.0 to function. The plugin will
 
 ## Key Features
 
-- 📞 **Call Center Operations**: Agent groups, queues, call distribution
-- 🕒 **Business Hours Management**: Automated routing based on schedules  
-- 📱 **Outbound Calling**: Click-to-call with proper caller ID
-- 💬 **SMS Integration**: Agent notifications and command system
-- 🎛️ **Workflow Builder**: Visual call flow creation
-- 🎤 **Voicemail System**: Recording, transcription, and notifications
-- 📊 **Real-time Dashboard**: Queue management and statistics
+### 📞 Call Center Operations
+- **Agent Groups**: Organize agents into groups with priority levels
+- **Call Queues**: Manage incoming calls with position announcements
+- **Smart Routing**: Distribute calls based on availability and schedules
+- **SMS Accept**: Agents can text "1" to accept incoming calls
+- **Queue Notifications**: SMS alerts to designated numbers when calls enter queues
 
-## Installation Methods
+### 🌐 Browser Phone (WebRTC)
+- **In-Browser Calling**: Make and receive calls directly from WordPress admin
+- **Twilio Voice SDK v2**: Uses latest SDK for WebRTC functionality
+- **Visual Dialpad**: Click-to-dial interface with DTMF support
+- **Call Controls**: Mute, hold indicators, call timer
+- **Auto-Answer**: Optional automatic call acceptance
+- **Queue Integration**: Accept calls from specific queues
+- **Token Management**: Automatic token refresh for uninterrupted service
 
-### Option 1: Installation Script (Recommended)
-```bash
-# Run in plugin directory
-./install-twilio-sdk.sh
-```
+### 🕒 Business Hours Management
+- **Schedule-based Routing**: Different call flows for business hours vs after-hours
+- **Holiday Support**: Define specific dates for holiday routing
+- **Multiple Schedules**: Create different schedules for departments
+- **After-Hours Actions**: Configurable routing when closed
 
-### Option 2: Composer (For Development)
-```bash
-composer install
-```
+### 🎛️ Workflow Builder
+- **Visual Interface**: Drag-and-drop workflow creation
+- **Step Types**:
+  - **Greeting**: Welcome messages with multiple voice options
+  - **IVR Menu**: Interactive voice response with digit collection
+  - **Call Queue**: Place callers in queue with hold music
+  - **Forward**: Route calls to specific numbers
+  - **Voicemail**: Record messages with transcription
+  - **Schedule Check**: Route based on business hours
+- **Voice Options**:
+  - Default Twilio voice (Say)
+  - ElevenLabs text-to-speech integration with voice persistence
+  - Custom audio file URLs
+- **Smart Voice Loading**: Saved voices display without API calls
 
-### Option 3: Manual Installation
-1. Download Twilio SDK v8.7.0 from GitHub
-2. Extract to `vendor/twilio/sdk/`  
-3. Create autoloader (see install script for reference)
+### 📱 SMS Integration
+- **Agent Notifications**: Automatic SMS alerts when calls arrive
+- **Queue Management**: Agents receive queue status updates
+- **Command System**: Text commands to manage availability
+- **SMS Logging**: Complete history of all SMS interactions
 
-## Architecture
+### 📊 Real-time Dashboard
+- **Queue Monitor**: Live view of waiting calls
+- **Agent Status**: Track agent availability
+- **Call Statistics**: Performance metrics and reporting
+- **Call Logs**: Detailed history with filtering options
+- **Active Call Display**: Real-time call count monitoring
 
-The plugin uses:
-- **Official Twilio PHP SDK v8.7.0** for all API operations
-- **Native TwiML classes** for response generation
-- **WordPress hooks and filters** for integration
-- **Custom database tables** for call management
-- **REST API endpoints** for webhooks
+### 🎤 Advanced Features
+- **Voicemail Transcription**: Automatic speech-to-text
+- **Callback System**: Offer callbacks instead of long holds
+- **Outbound Calling**: Click-to-call with proper caller ID
+- **Multiple Phone Numbers**: Support for multiple business lines
+- **Agent Phone Management**: Store and validate agent phone numbers
+- **Duplicate Prevention**: Ensures unique phone numbers per agent
+
+## Recent Updates
+
+### Browser Phone Upgrade (v2.0)
+- **Migrated to Twilio Voice SDK v2**: Replaced deprecated Client SDK v1.14
+- **Improved Stability**: Better error handling and automatic recovery
+- **Token Management**: Auto-refresh tokens before expiration
+- **Enhanced Performance**: Modern WebRTC implementation
+
+### Queue System Improvements
+- **Notification Numbers**: Queues now use notification_number field for SMS alerts
+- **No Direct Assignment**: Queues are workflow destinations, not directly assigned to numbers
+- **Better Integration**: Improved queue handling in IVR and workflow steps
+
+### Voice Configuration Enhancements
+- **Voice Persistence**: ElevenLabs voices save both ID and name
+- **No Unnecessary API Calls**: Saved voices display immediately without loading
+- **Improved UX**: Load voices only when changing selection
+
+### IVR Fixes
+- **Form Field Handling**: Fixed IVR option saving and loading
+- **Queue Selection**: Proper queue routing based on digit selection
+- **Voice Selection**: Fixed voice dropdown persistence issues
+
+## How It Works
+
+### Call Flow
+1. **Incoming Call** → Twilio webhook triggers
+2. **Workflow Processing** → System loads assigned workflow
+3. **Step Execution** → Each workflow step processes sequentially:
+   - Greeting plays welcome message
+   - IVR collects user input
+   - Schedule check determines routing
+   - Queue or forward based on configuration
+4. **Agent Connection** → Call routed to available agent
+5. **Logging** → All interactions logged for reporting
+
+### Queue System
+- **Queue Assignment**: Calls routed to queues through workflows
+- **Notification Numbers**: Optional SMS alerts to designated numbers (not agents)
+- **Agent Groups**: Queues linked to agent groups for distribution
+- **Wait Experience**: Configurable hold music and position announcements
+- **Timeout Handling**: Automatic callback offers after timeout
+- **Browser Phone Integration**: Agents can accept queue calls via browser
+
+### Agent Management
+- **Phone Number Storage**: Agent numbers stored in WordPress user profiles
+- **Status Tracking**: Available/Busy/Offline states
+- **SMS Commands**: Text "1" to accept calls
+- **Priority Levels**: Agents have priority within groups
+- **Browser Phone Mode**: Option to receive calls in browser or cell phone
 
 ## Configuration
 
-1. Install the SDK using the provided script
-2. Configure Twilio credentials in WordPress admin
-3. Set up phone numbers and webhook URLs
-4. Create agent groups and workflows
-5. Test with sample calls
+### Initial Setup
+1. **Install Plugin** and activate in WordPress
+2. **Install Twilio SDK** using provided script
+3. **Configure Credentials**:
+   - Navigate to **Twilio** → **Settings**
+   - Enter Twilio Account SID and Auth Token
+   - Set default SMS number for notifications
+   - Configure TwiML App SID for browser phone (optional)
+
+### Phone Number Setup
+1. **In Twilio Console**:
+   - Purchase or select phone number
+   - Configure Voice webhook: `https://yoursite.com/wp-json/twilio-webhook/v1/voice`
+   - Configure SMS webhook: `https://yoursite.com/wp-json/twilio-webhook/v1/sms`
+   - Set method to HTTP POST
+
+2. **In WordPress Admin**:
+   - Go to **Twilio** → **Phone Numbers**
+   - Verify numbers are synchronized
+   - Assign workflows to numbers
+
+### Creating Workflows
+1. **Navigate to** Twilio → Workflows
+2. **Create New Workflow**:
+   - Name your workflow
+   - Select phone number to assign
+   - Add steps using the builder
+
+3. **Configure Steps**:
+   - **Greeting**: Set welcome message and voice
+   - **IVR Menu**: Define options and routing
+   - **Queue**: Select target queue
+   - **Schedule**: Choose business hours schedule
+
+### Setting Up Queues
+1. **Create Queue** (Twilio → Queues):
+   - Queue Name: Descriptive name
+   - Notification Number: SMS alerts for queue activity (optional)
+   - Agent Group: Select assigned group
+   - Wait Music: URL for hold music
+   - Timeout: Maximum wait time
+
+2. **Use in Workflows**:
+   - Add Queue step to workflow
+   - Select queue from dropdown
+   - Configure announcement message
+
+### Browser Phone Setup
+1. **Create TwiML App** in Twilio Console:
+   - Voice Request URL: Your server's TwiML endpoint
+   - Copy the Application SID
+
+2. **Configure in WordPress**:
+   - Go to **Twilio** → **Settings**
+   - Enter TwiML App SID
+   - Save settings
+
+3. **Access Browser Phone**:
+   - Navigate to **Twilio** → **Browser Phone**
+   - Select caller ID from available numbers
+   - Start making/receiving calls
+
+### Agent Configuration
+1. **Create Agent Groups** (Twilio → Agent Groups)
+2. **Add Agents** to groups with priorities
+3. **Set Phone Numbers** in user profiles
+4. **Configure Call Mode**: Browser or cell phone
+5. **Train Agents** on SMS commands and browser phone
+
+## Voice Configuration
+
+### ElevenLabs Integration
+1. **Get API Key** from ElevenLabs dashboard
+2. **Configure in Settings**: Add API key
+3. **Select Voices** in workflow steps:
+   - Click "Load Voices" to fetch available options
+   - Selected voices are saved with both ID and name
+   - Voice names persist across edits without API calls
+
+### Audio Options per Step
+- **Say**: Default Twilio text-to-speech
+- **TTS**: ElevenLabs premium voices with persistence
+- **Audio**: Custom MP3 file URLs
 
 ## Troubleshooting
 
-### "Twilio SDK classes not available" Error
+### Common Issues
 
-1. **Run the installation script**:
-   ```bash
-   chmod +x install-twilio-sdk.sh
-   ./install-twilio-sdk.sh
-   ```
+#### Browser Phone "Client version not supported"
+- **Fixed in latest version**: Upgraded to Voice SDK v2
+- Clear browser cache and reload page
+- Check TwiML App SID is configured
 
-2. **Test SDK installation**:
-   ```bash
-   php test-sdk.php
-   ```
+#### "Twilio SDK classes not available"
+```bash
+# Reinstall SDK
+./install-twilio-sdk.sh
+# Test installation
+php test-sdk.php
+```
 
-3. **Check file permissions**:
-   ```bash
-   ls -la vendor/
-   ls -la vendor/twilio/sdk/
-   ```
-
-4. **Verify directory structure**:
-   ```
-   vendor/
-   ├── autoload.php
-   └── twilio/
-       └── sdk/
-           ├── Rest/Client.php
-           ├── TwiML/VoiceResponse.php
-           └── ... (other SDK files)
-   ```
-
-### Plugin Shows 500 Error
+#### Calls Not Routing to Queues
+- Verify queue exists and is active
+- Check agent group has members
+- Ensure agents have valid phone numbers
+- Review workflow step configuration
+- Check notification_number field (not phone_number)
 
+#### SMS Not Sending from Admin
+- Test with direct PHP script: `php test-twilio-direct.php send`
+- Verify Twilio credentials in settings
 - Check WordPress error logs
-- Enable WP_DEBUG in wp-config.php
-- Look for TWP Plugin error messages in logs
+- Ensure number is SMS-capable in Twilio
 
-### SDK Installation Fails
+#### Voice Selections Not Saving
+- Voices now save both ID and name automatically
+- No API call needed to display saved voices
+- Click "Load Voices" only to change selection
+- Check browser console for JavaScript errors
 
-- Ensure `curl` and `tar` are installed
-- Check internet connection
-- Try manual installation (see Installation Methods)
+#### IVR Options Not Working
+- Ensure only active form fields are enabled
+- Check queue selections are properly saved
+- Verify digit mappings in workflow data
+
+### Debug Mode
+Enable WordPress debugging in `wp-config.php`:
+```php
+define('WP_DEBUG', true);
+define('WP_DEBUG_LOG', true);
+define('WP_DEBUG_DISPLAY', false);
+```
+
+### Testing Tools
+- **Direct SMS Test**: `php test-twilio-direct.php send`
+- **SDK Test**: `php test-sdk.php`
+- **Webhook Simulator**: Use Twilio Console debugger
+- **Call Logs**: Review in WordPress admin
+- **Browser Phone**: Test WebRTC connectivity
+
+## Database Structure
+
+The plugin creates these tables:
+- `twp_phone_schedules` - Business hours definitions
+- `twp_call_queues` - Queue configurations (uses notification_number)
+- `twp_queued_calls` - Active calls in queues
+- `twp_workflows` - Call flow definitions with voice persistence
+- `twp_call_log` - Complete call history
+- `twp_sms_log` - SMS message tracking
+- `twp_voicemails` - Recordings and transcriptions
+- `twp_agent_groups` - Agent group definitions
+- `twp_group_members` - User-to-group relationships
+- `twp_agent_status` - Real-time agent availability
+- `twp_callbacks` - Callback request queue
+
+## Webhook Endpoints
+
+All webhooks are REST API endpoints under `/wp-json/twilio-webhook/v1/`:
+- `/voice` - Main incoming call handler
+- `/sms` - SMS message handler
+- `/ivr-response` - IVR digit collection (fixed in latest)
+- `/queue-wait` - Queue hold experience
+- `/agent-connect` - Agent connection handler
+- `/callback-request` - Callback system
+- `/outbound-agent-with-from` - Outbound calling
+
+## Technical Details
+
+### Dependencies
+- **Twilio PHP SDK v8.7.0** - Server-side API operations
+- **Twilio Voice SDK v2** - Browser phone WebRTC
+- **WordPress REST API** - Webhook handling
+- **jQuery** - Admin interface interactions
+
+### Browser Compatibility
+- **Chrome/Edge**: Full support
+- **Firefox**: Full support
+- **Safari**: Requires HTTPS for WebRTC
+- **Mobile Browsers**: Limited WebRTC support
+
+### Security Considerations
+- All webhooks use WordPress nonce verification
+- Phone numbers validated and sanitized
+- SQL queries use prepared statements
+- Sensitive data encrypted in database
+- HTTPS required for production use
+
+## Version History
+
+### v2.0.0 (Current)
+- Upgraded to Twilio Voice SDK v2 for browser phone
+- Fixed queue notification_number field naming
+- Enhanced voice selection persistence
+- Fixed IVR option saving and loading
+- Improved error handling and logging
+- Added automatic token refresh
+
+### v1.3.x
+- Initial release with full call center features
+- Browser phone with Client SDK v1.14
+- Basic workflow builder
+- Queue management system
 
 ## Support
 
 - Check `CLAUDE.md` for detailed technical documentation
-- Review `TWILIO_SDK_MIGRATION.md` for migration details  
-- Enable WordPress debug logging for troubleshooting
-- Use Twilio Console debugger for webhook testing
+- Review error logs in `/wp-content/debug.log`
+- Monitor Twilio Console for webhook errors
+- Test components individually using provided scripts
+- Report issues with specific error messages and logs
 
 ## License
 
-This plugin integrates with Twilio services and requires a Twilio account.
+This plugin integrates with Twilio services and requires a Twilio account.
\ No newline at end of file
diff --git a/admin/class-twp-admin.php b/admin/class-twp-admin.php
index 302dccd..e716ab9 100644
--- a/admin/class-twp-admin.php
+++ b/admin/class-twp-admin.php
@@ -19,132 +19,175 @@ class TWP_Admin {
      * Register admin menu
      */
     public function add_plugin_admin_menu() {
-        add_menu_page(
-            'Twilio WP Plugin',
-            'Twilio Phone',
-            'manage_options',
-            'twilio-wp-plugin',
-            array($this, 'display_plugin_dashboard'),
-            'dashicons-phone',
-            30
-        );
+        // Determine if user has any agent access
+        $has_agent_access = current_user_can('twp_access_voicemails') ||
+                           current_user_can('twp_access_call_log') ||
+                           current_user_can('twp_access_agent_queue') ||
+                           current_user_can('twp_access_sms_inbox') ||
+                           current_user_can('twp_access_browser_phone');
         
-        add_submenu_page(
-            'twilio-wp-plugin',
-            'Dashboard',
-            'Dashboard',
-            'manage_options',
-            'twilio-wp-plugin',
-            array($this, 'display_plugin_dashboard')
-        );
+        // Only show menu if user is admin or has agent access
+        if (!current_user_can('manage_options') && !$has_agent_access) {
+            return;
+        }
         
-        add_submenu_page(
-            'twilio-wp-plugin',
-            'Settings',
-            'Settings',
-            'manage_options',
-            'twilio-wp-settings',
-            array($this, 'display_plugin_settings')
-        );
+        // Main menu - show dashboard for admins, redirect to first available page for agents
+        if (current_user_can('manage_options')) {
+            add_menu_page(
+                'Twilio WP Plugin',
+                'Twilio Phone',
+                'manage_options',
+                'twilio-wp-plugin',
+                array($this, 'display_plugin_dashboard'),
+                'dashicons-phone',
+                30
+            );
+            
+            add_submenu_page(
+                'twilio-wp-plugin',
+                'Dashboard',
+                'Dashboard',
+                'manage_options',
+                'twilio-wp-plugin',
+                array($this, 'display_plugin_dashboard')
+            );
+        } else {
+            // For agents, determine first available page
+            $first_page = 'twilio-wp-browser-phone'; // Default to browser phone
+            if (current_user_can('twp_access_voicemails')) $first_page = 'twilio-wp-voicemails';
+            elseif (current_user_can('twp_access_call_log')) $first_page = 'twilio-wp-call-logs';
+            elseif (current_user_can('twp_access_agent_queue')) $first_page = 'twilio-wp-agent-queue';
+            elseif (current_user_can('twp_access_sms_inbox')) $first_page = 'twilio-wp-sms-inbox';
+            elseif (current_user_can('twp_access_browser_phone')) $first_page = 'twilio-wp-browser-phone';
+            
+            add_menu_page(
+                'Twilio Phone',
+                'Twilio Phone',
+                'read',
+                $first_page,
+                null,
+                'dashicons-phone',
+                30
+            );
+        }
         
-        add_submenu_page(
-            'twilio-wp-plugin',
-            'Phone Schedules',
-            'Schedules',
-            'manage_options',
-            'twilio-wp-schedules',
-            array($this, 'display_schedules_page')
-        );
+        // Admin-only pages
+        if (current_user_can('manage_options')) {
+            add_submenu_page(
+                'twilio-wp-plugin',
+                'Settings',
+                'Settings',
+                'manage_options',
+                'twilio-wp-settings',
+                array($this, 'display_plugin_settings')
+            );
+            
+            add_submenu_page(
+                'twilio-wp-plugin',
+                'Phone Schedules',
+                'Schedules',
+                'manage_options',
+                'twilio-wp-schedules',
+                array($this, 'display_schedules_page')
+            );
+            
+            add_submenu_page(
+                'twilio-wp-plugin',
+                'Workflows',
+                'Workflows',
+                'manage_options',
+                'twilio-wp-workflows',
+                array($this, 'display_workflows_page')
+            );
+            
+            add_submenu_page(
+                'twilio-wp-plugin',
+                'Call Queues',
+                'Queues',
+                'manage_options',
+                'twilio-wp-queues',
+                array($this, 'display_queues_page')
+            );
+            
+            add_submenu_page(
+                'twilio-wp-plugin',
+                'Phone Numbers',
+                'Phone Numbers',
+                'manage_options',
+                'twilio-wp-numbers',
+                array($this, 'display_numbers_page')
+            );
+            
+            add_submenu_page(
+                'twilio-wp-plugin',
+                'Agent Groups',
+                'Agent Groups',
+                'manage_options',
+                'twilio-wp-groups',
+                array($this, 'display_groups_page')
+            );
+        }
         
-        add_submenu_page(
-            'twilio-wp-plugin',
-            'Workflows',
-            'Workflows',
-            'manage_options',
-            'twilio-wp-workflows',
-            array($this, 'display_workflows_page')
-        );
+        // Agent-accessible pages
+        $menu_parent = current_user_can('manage_options') ? 'twilio-wp-plugin' : null;
         
-        add_submenu_page(
-            'twilio-wp-plugin',
-            'Call Queues',
-            'Queues',
-            'manage_options',
-            'twilio-wp-queues',
-            array($this, 'display_queues_page')
-        );
+        if (current_user_can('manage_options') || current_user_can('twp_access_voicemails')) {
+            add_submenu_page(
+                $menu_parent,
+                'Voicemails',
+                'Voicemails',
+                current_user_can('manage_options') ? 'manage_options' : 'twp_access_voicemails',
+                'twilio-wp-voicemails',
+                array($this, 'display_voicemails_page')
+            );
+        }
         
-        add_submenu_page(
-            'twilio-wp-plugin',
-            'Phone Numbers',
-            'Phone Numbers',
-            'manage_options',
-            'twilio-wp-numbers',
-            array($this, 'display_numbers_page')
-        );
+        if (current_user_can('manage_options') || current_user_can('twp_access_call_log')) {
+            add_submenu_page(
+                $menu_parent,
+                'Call Logs',
+                'Call Logs',
+                current_user_can('manage_options') ? 'manage_options' : 'twp_access_call_log',
+                'twilio-wp-call-logs',
+                array($this, 'display_call_logs_page')
+            );
+        }
         
-        add_submenu_page(
-            'twilio-wp-plugin',
-            'Voicemails',
-            'Voicemails',
-            'manage_options',
-            'twilio-wp-voicemails',
-            array($this, 'display_voicemails_page')
-        );
+        if (current_user_can('manage_options') || current_user_can('twp_access_agent_queue')) {
+            add_submenu_page(
+                $menu_parent,
+                'Agent Queue',
+                'Agent Queue',
+                current_user_can('manage_options') ? 'manage_options' : 'twp_access_agent_queue',
+                'twilio-wp-agent-queue',
+                array($this, 'display_agent_queue_page')
+            );
+        }
         
-        add_submenu_page(
-            'twilio-wp-plugin',
-            'Call Logs',
-            'Call Logs',
-            'manage_options',
-            'twilio-wp-call-logs',
-            array($this, 'display_call_logs_page')
-        );
+        // Outbound Calls page removed - functionality merged into Browser Phone
+        // Keeping capability 'twp_access_outbound_calls' for backwards compatibility
         
-        add_submenu_page(
-            'twilio-wp-plugin',
-            'Agent Groups',
-            'Agent Groups',
-            'manage_options',
-            'twilio-wp-groups',
-            array($this, 'display_groups_page')
-        );
+        if (current_user_can('manage_options') || current_user_can('twp_access_sms_inbox')) {
+            add_submenu_page(
+                $menu_parent,
+                'SMS Inbox',
+                'SMS Inbox',
+                current_user_can('manage_options') ? 'manage_options' : 'twp_access_sms_inbox',
+                'twilio-wp-sms-inbox',
+                array($this, 'display_sms_inbox_page')
+            );
+        }
         
-        add_submenu_page(
-            'twilio-wp-plugin',
-            'Agent Queue',
-            'Agent Queue',
-            'manage_options',
-            'twilio-wp-agent-queue',
-            array($this, 'display_agent_queue_page')
-        );
-        
-        add_submenu_page(
-            'twilio-wp-plugin',
-            'Outbound Calls',
-            'Outbound Calls',
-            'manage_options',
-            'twilio-wp-outbound',
-            array($this, 'display_outbound_calls_page')
-        );
-        
-        add_submenu_page(
-            'twilio-wp-plugin',
-            'SMS Inbox',
-            'SMS Inbox',
-            'manage_options',
-            'twilio-wp-sms-inbox',
-            array($this, 'display_sms_inbox_page')
-        );
-        
-        add_submenu_page(
-            'twilio-wp-plugin',
-            'Browser Phone',
-            'Browser Phone',
-            'manage_options',
-            'twilio-wp-browser-phone',
-            array($this, 'display_browser_phone_page')
-        );
+        if (current_user_can('manage_options') || current_user_can('twp_access_browser_phone')) {
+            add_submenu_page(
+                $menu_parent,
+                'Browser Phone',
+                'Browser Phone',
+                current_user_can('manage_options') ? 'manage_options' : 'twp_access_browser_phone',
+                'twilio-wp-browser-phone',
+                array($this, 'display_browser_phone_page')
+            );
+        }
     }
     
     /**
@@ -5448,105 +5491,185 @@ class TWP_Admin {
             }
             </style>
             
-            <script src="https://sdk.twilio.com/js/client/v1.14/twilio.min.js"></script>
+            <!-- Twilio Voice SDK v2 from unpkg CDN -->
+            <script src="https://unpkg.com/@twilio/voice-sdk@2.11.0/dist/twilio.min.js"></script>
             <script>
             jQuery(document).ready(function($) {
                 var device = null;
-                var currentConnection = null;
+                var currentCall = null;
                 var callTimer = null;
                 var callStartTime = null;
                 
+                // Wait for SDK to load
+                function waitForTwilioSDK(callback) {
+                    if (typeof Twilio !== 'undefined' && Twilio.Device) {
+                        callback();
+                    } else {
+                        console.log('Waiting for Twilio Voice SDK to load...');
+                        setTimeout(function() {
+                            waitForTwilioSDK(callback);
+                        }, 100);
+                    }
+                }
+                
                 // Initialize the browser phone
                 function initializeBrowserPhone() {
                     $('#phone-status').text('Initializing...');
                     
-                    // Get capability token
-                    $.post(ajaxurl, {
-                        action: 'twp_generate_capability_token',
-                        nonce: '<?php echo wp_create_nonce('twp_ajax_nonce'); ?>'
-                    }, function(response) {
-                        if (response.success) {
-                            $('#browser-phone-error').hide();
-                            setupTwilioDevice(response.data.token);
-                        } else {
-                            showError('Failed to initialize: ' + response.error);
-                        }
-                    }).fail(function() {
-                        showError('Failed to connect to server');
+                    // Wait for SDK before proceeding
+                    waitForTwilioSDK(function() {
+                        // Get capability token (access token for v2)
+                        $.post(ajaxurl, {
+                            action: 'twp_generate_capability_token',
+                            nonce: '<?php echo wp_create_nonce('twp_ajax_nonce'); ?>'
+                        }, function(response) {
+                            if (response.success) {
+                                $('#browser-phone-error').hide();
+                                setupTwilioDevice(response.data.token);
+                            } else {
+                                showError('Failed to initialize: ' + response.error);
+                            }
+                        }).fail(function() {
+                            showError('Failed to connect to server');
+                        });
                     });
                 }
                 
-                function setupTwilioDevice(token) {
+                async function setupTwilioDevice(token) {
                     try {
-                        // Setup Twilio Device
-                        Twilio.Device.setup(token, {
-                            debug: true,
-                            codecPreferences: ['opus', 'pcmu']
+                        // Check if Twilio SDK is available
+                        if (typeof Twilio === 'undefined' || !Twilio.Device) {
+                            throw new Error('Twilio Voice SDK not loaded');
+                        }
+                        
+                        // Clean up existing device if any
+                        if (device) {
+                            await device.destroy();
+                        }
+                        
+                        // Setup Twilio Voice SDK v2 Device
+                        // Note: Voice SDK v2 uses Twilio.Device directly, not Twilio.Voice.Device
+                        device = new Twilio.Device(token, {
+                            logLevel: 1, // 0 = TRACE, 1 = DEBUG
+                            codecPreferences: ['opus', 'pcmu'],
+                            edge: 'sydney' // Or closest edge location
                         });
                         
-                        // Use modern EventEmitter interface instead of deprecated callbacks
-                        Twilio.Device.on('ready', function(device) {
+                        // Set up event handlers BEFORE registering
+                        // Device registered and ready
+                        device.on('registered', function() {
+                            console.log('Device registered successfully');
                             $('#phone-status').text('Ready').css('color', '#4CAF50');
                             $('#call-btn').prop('disabled', false);
                         });
                         
-                        Twilio.Device.on('error', function(error) {
+                        // Handle errors
+                        device.on('error', function(error) {
                             console.error('Twilio Device Error:', error);
                             
-                            var errorMsg = error.message;
+                            var errorMsg = error.message || error.toString();
                             
                             // Provide specific help for common errors
-                            if (error.message.includes('valid callerId must be provided')) {
+                            if (errorMsg.includes('valid callerId must be provided')) {
                                 errorMsg = 'Caller ID error: Make sure you select a verified Twilio phone number as Caller ID. The number must be purchased through your Twilio account.';
-                            } else if (error.message.includes('TwiML App')) {
+                            } else if (errorMsg.includes('TwiML App')) {
                                 errorMsg = 'TwiML App error: Check that your TwiML App SID is correctly configured in Settings.';
-                            } else if (error.message.includes('token')) {
-                                errorMsg = 'Token error: ' + error.message + ' - The page will automatically try to refresh the token.';
+                            } else if (errorMsg.includes('token') || errorMsg.includes('Token')) {
+                                errorMsg = 'Token error: ' + errorMsg + ' - The page will automatically try to refresh the token.';
+                                // Try to reinitialize after token error
+                                setTimeout(initializeBrowserPhone, 5000);
                             }
                             
                             showError(errorMsg);
                         });
                         
-                        Twilio.Device.on('connect', function(conn) {
-                            currentConnection = conn;
-                            $('#phone-status').text('Connected').css('color', '#2196F3');
-                            $('#call-btn').hide();
-                            $('#hangup-btn').show();
-                            $('#phone-controls-extra').show();
-                            
-                            startCallTimer();
-                        });
-                        
-                        Twilio.Device.on('disconnect', function(conn) {
-                            currentConnection = null;
-                            $('#phone-status').text('Ready').css('color', '#4CAF50');
-                            $('#hangup-btn').hide();
-                            $('#answer-btn').hide();
-                            $('#call-btn').show();
-                            $('#phone-controls-extra').hide();
-                            $('#call-timer').hide();
-                            
-                            stopCallTimer();
-                        });
-                        
-                        Twilio.Device.on('incoming', function(conn) {
-                            currentConnection = conn;
+                        // Handle incoming calls
+                        device.on('incoming', function(call) {
+                            currentCall = call;
                             $('#phone-status').text('Incoming Call').css('color', '#FF9800');
-                            $('#phone-number-display').text(conn.parameters.From || 'Unknown Number');
+                            $('#phone-number-display').text(call.parameters.From || 'Unknown Number');
                             $('#call-btn').hide();
                             $('#answer-btn').show();
                             
+                            // Setup call event handlers
+                            setupCallHandlers(call);
+                            
                             if ($('#auto-answer').is(':checked')) {
-                                conn.accept();
+                                call.accept();
                             }
                         });
                         
+                        // Token about to expire
+                        device.on('tokenWillExpire', function() {
+                            console.log('Token will expire soon, refreshing...');
+                            refreshToken();
+                        });
+                        
+                        // Register device AFTER setting up event handlers
+                        await device.register();
+                        
                     } catch (error) {
                         console.error('Error setting up Twilio Device:', error);
                         showError('Failed to setup device: ' + error.message);
                     }
                 }
                 
+                function setupCallHandlers(call) {
+                    // Call accepted/connected
+                    call.on('accept', function() {
+                        $('#phone-status').text('Connected').css('color', '#2196F3');
+                        $('#call-btn').hide();
+                        $('#answer-btn').hide();
+                        $('#hangup-btn').show();
+                        $('#phone-controls-extra').show();
+                        startCallTimer();
+                    });
+                    
+                    // Call disconnected
+                    call.on('disconnect', function() {
+                        currentCall = null;
+                        $('#phone-status').text('Ready').css('color', '#4CAF50');
+                        $('#hangup-btn').hide();
+                        $('#answer-btn').hide();
+                        $('#call-btn').show();
+                        $('#phone-controls-extra').hide();
+                        $('#call-timer').hide();
+                        stopCallTimer();
+                    });
+                    
+                    // Call rejected
+                    call.on('reject', function() {
+                        currentCall = null;
+                        $('#phone-status').text('Ready').css('color', '#4CAF50');
+                        $('#answer-btn').hide();
+                        $('#call-btn').show();
+                    });
+                    
+                    // Call cancelled (by caller before answer)
+                    call.on('cancel', function() {
+                        currentCall = null;
+                        $('#phone-status').text('Missed Call').css('color', '#FF9800');
+                        $('#answer-btn').hide();
+                        $('#call-btn').show();
+                        setTimeout(function() {
+                            $('#phone-status').text('Ready').css('color', '#4CAF50');
+                        }, 3000);
+                    });
+                }
+                
+                function refreshToken() {
+                    $.post(ajaxurl, {
+                        action: 'twp_generate_capability_token',
+                        nonce: '<?php echo wp_create_nonce('twp_ajax_nonce'); ?>'
+                    }, function(response) {
+                        if (response.success && device) {
+                            device.updateToken(response.data.token);
+                        }
+                    }).fail(function() {
+                        console.error('Failed to refresh token');
+                    });
+                }
+                
                 function showError(message) {
                     $('#browser-phone-error').html('<p><strong>Error:</strong> ' + message + '</p>').show();
                     $('#phone-status').text('Error').css('color', '#f44336');
@@ -5597,7 +5720,7 @@ class TWP_Admin {
                 });
                 
                 // Call button
-                $('#call-btn').on('click', function() {
+                $('#call-btn').on('click', async function() {
                     var phoneNumber = $('#phone-number-input').val().trim();
                     var callerId = $('#caller-id-select').val();
                     
@@ -5611,6 +5734,11 @@ class TWP_Admin {
                         return;
                     }
                     
+                    if (!device) {
+                        alert('Phone is not initialized. Please refresh the page.');
+                        return;
+                    }
+                    
                     // Format phone number
                     phoneNumber = phoneNumber.replace(/\D/g, '');
                     if (phoneNumber.length === 10) {
@@ -5631,7 +5759,8 @@ class TWP_Admin {
                         };
                         
                         console.log('Making call with params:', params);
-                        currentConnection = Twilio.Device.connect(params);
+                        currentCall = await device.connect({params: params});
+                        setupCallHandlers(currentCall);
                     } catch (error) {
                         console.error('Call error:', error);
                         showError('Failed to make call: ' + error.message);
@@ -5641,30 +5770,40 @@ class TWP_Admin {
                 
                 // Hangup button
                 $('#hangup-btn').on('click', function() {
-                    if (currentConnection) {
-                        currentConnection.disconnect();
+                    if (currentCall) {
+                        currentCall.disconnect();
                     }
                 });
                 
                 // Answer button
                 $('#answer-btn').on('click', function() {
-                    if (currentConnection) {
-                        currentConnection.accept();
+                    if (currentCall) {
+                        currentCall.accept();
                     }
                 });
                 
                 // Mute button
                 $('#mute-btn').on('click', function() {
-                    if (currentConnection) {
-                        var muted = currentConnection.isMuted();
-                        currentConnection.mute(!muted);
+                    if (currentCall) {
+                        var muted = currentCall.isMuted();
+                        currentCall.mute(!muted);
                         $(this).text(muted ? 'Mute' : 'Unmute');
                         $(this).find('.dashicons').toggleClass('dashicons-microphone dashicons-microphone');
                     }
                 });
                 
-                // Initialize on page load
-                initializeBrowserPhone();
+                // Check if SDK loaded and initialize
+                $(window).on('load', function() {
+                    setTimeout(function() {
+                        if (typeof Twilio === 'undefined') {
+                            showError('Twilio Voice SDK failed to load. Please check your internet connection and try refreshing the page.');
+                            console.error('Twilio SDK not found. Script may be blocked or failed to load.');
+                        } else {
+                            console.log('Twilio SDK loaded successfully');
+                            initializeBrowserPhone();
+                        }
+                    }, 1000);
+                });
                 
                 // Refresh token every 50 minutes (tokens expire in 1 hour)
                 setInterval(initializeBrowserPhone, 50 * 60 * 1000);
diff --git a/includes/class-twp-activator.php b/includes/class-twp-activator.php
index 5e83850..8d78a98 100644
--- a/includes/class-twp-activator.php
+++ b/includes/class-twp-activator.php
@@ -14,6 +14,9 @@ class TWP_Activator {
         // Set default options
         self::set_default_options();
         
+        // Create custom user roles
+        self::create_user_roles();
+        
         // Set the database version
         if (defined('TWP_DB_VERSION')) {
             update_option('twp_db_version', TWP_DB_VERSION);
@@ -373,4 +376,29 @@ class TWP_Activator {
         add_option('twp_sms_notification_number', '');
         add_option('twp_default_sms_number', '');
     }
+    
+    /**
+     * Create custom user roles for the plugin
+     */
+    private static function create_user_roles() {
+        // Remove role first if it exists to ensure clean setup
+        remove_role('phone_agent');
+        
+        // Add Phone Agent role with limited capabilities
+        add_role('phone_agent', 'Phone Agent', array(
+            // Basic WordPress capabilities
+            'read' => true,
+            
+            // Profile management
+            'edit_profile' => true,
+            
+            // Phone agent specific capabilities
+            'twp_access_voicemails' => true,
+            'twp_access_call_log' => true,
+            'twp_access_agent_queue' => true,
+            'twp_access_outbound_calls' => true,
+            'twp_access_sms_inbox' => true,
+            'twp_access_browser_phone' => true,
+        ));
+    }
 }
\ No newline at end of file