Supported SIP Providers

VoxPria works with any standard SIP provider, giving you flexibility to choose the service that best fits your needs. This guide covers recommended providers and configuration details.

Provider Compatibility #

Three Integration Tiers #

Tier 1: Native Integration

• Pre-configured settings in VoxPria
• Optimized for specific provider
• Streamlined setup process
• Examples: ElevenLabs, OpenAI

Tier 2: Tested & Recommended

• Confirmed compatibility with VoxPria
• Generic SIP configuration used
• Setup documentation available
• Examples: Twilio, Telnyx, Bandwidth

Tier 3: Generic SIP

• Any RFC-compliant SIP provider
• Manual configuration required
• Standard SIP features supported
• Provider-specific features vary

Native Integrations #

ElevenLabs SIP #

Best For: Full-featured voice AI with bidirectional calling
Key Features:

• Inbound and outbound calls
• Voice campaigns
• High-quality text-to-speech
• Advanced speech recognition
• Call recordings included
• Per-number provisioning

Pros:

• Easy setup with pre-configured settings
• Excellent voice quality
• Comprehensive feature set
• Built-in Conversational AI
• Competitive pricing

Cons:

• Requires ElevenLabs account
• Limited to ElevenLabs phone numbers (or BYO SIP trunk)

Setup Requirements:

• SIP username from ElevenLabs
• SIP password from ElevenLabs
• Server: sip.rtc.elevenlabs.io
• Port: 5061 (TLS) or 5060 (TCP)

Pricing:

• Phone numbers: ~$1-5/month (varies by country)
• Per-minute charges apply
• Conversational AI usage fees
• Visit ElevenLabs Pricing

Get Started:

1. Sign up at ElevenLabs
2. Navigate to Conversational AI section
3. Get SIP credentials
4. Follow our ElevenLabs Setup Guide

OpenAI SIP #

Best For: GPT-4o Realtime integration for inbound calls
Key Features:

• Ultra-low latency responses
• GPT-4o Realtime API
• Natural conversations
• WebRTC technology
• Advanced AI capabilities

Pros:

• State-of-the-art language understanding
• Near-instant response times
• Rich conversational context
• Seamless OpenAI integration

Cons:

• Inbound calls only (no outbound)
• No campaign support
• No server-side recordings
• Natural agents only
• Higher per-minute costs

Setup Requirements:

• OpenAI Project ID
• OpenAI API Key
• Webhook secret for security
• Phone numbers from separate SIP provider

Pricing:

• OpenAI Realtime API per-second charges
• Separate phone number costs from SIP provider
• Check OpenAI Pricing

Get Started:

1. Create project at OpenAI Platform
2. Generate API key with Realtime permissions
3. Configure webhook endpoint
4. Follow our OpenAI Setup Guide

Recommended Generic Providers #

Twilio #

Best For: Enterprise-grade reliability and global reach
Overview:

Twilio is one of the largest cloud communications platforms, offering extensive SIP trunking capabilities with excellent reliability and global phone number availability.

Key Features:

• Global phone number availability (100+ countries)
• Excellent uptime and reliability
• Comprehensive API and SDKs
• Strong security features
• Detailed call analytics
• Flexible routing options

VoxPria Compatibility:

• ✓ Inbound calls
• ✓ Outbound calls
• ✓ TLS encryption
• ✓ IP allowlisting
• ✓ Call recordings

Setup Configuration:
`

Provider: Generic

SIP Server: [your-account].pstn.twilio.com

Port: 5061 (TLS) or 5060 (TCP)

Transport: TLS (recommended)

Username: From Twilio SIP trunk credentials

Password: From Twilio SIP trunk credentials

`
Pricing:

• Phone numbers: $1-15/month (varies by country)
• Inbound: $0.0085/min
• Outbound: Varies by destination
• Visit Twilio Pricing

Configuration Steps:

1. Create Twilio account
2. Purchase phone number or port existing
3. Create SIP Trunk in Twilio Console
4. Configure termination URI to point to VoxPria
5. Get SIP credentials
6. Create Generic trunk in VoxPria with credentials

Documentation:

• Twilio SIP Trunking

Telnyx #

Best For: Cost-effective solution with modern API
Overview:

Telnyx provides competitive pricing with a modern, developer-friendly platform. Great balance of features and cost for high-volume users.

Key Features:

• Competitive pricing
• Real-time API
• Global network
• Instant provisioning
• Mission Control Portal for management
• Free trial credits available

VoxPria Compatibility:

• ✓ Inbound calls
• ✓ Outbound calls
• ✓ TLS encryption
• ✓ High-volume support
• ✓ Call recordings

Setup Configuration:
`

Provider: Generic

SIP Server: sip.telnyx.com

Port: 5061 (TLS) or 5060 (TCP)

Transport: TLS (recommended)

Username: From Telnyx SIP credentials

Password: From Telnyx SIP credentials

`
Pricing:

• Phone numbers: $1-2/month for most countries
• Inbound: $0.004/min
• Outbound: $0.01/min (varies by destination)
• Visit Telnyx Pricing

Configuration Steps:

1. Sign up at Telnyx
2. Purchase or port phone number
3. Create SIP connection in Mission Control
4. Configure inbound settings
5. Generate SIP credentials
6. Create Generic trunk in VoxPria

Documentation:

• Telnyx SIP Guide

Bandwidth #

Best For: Carrier-grade voice quality and reliability
Overview:

Bandwidth owns its own network infrastructure, providing exceptional call quality and reliability. Excellent for mission-critical applications.

Key Features:

• Owns network infrastructure
• Excellent voice quality
• 911/E911 support
• Compliance features
• Enterprise SLAs available
• STIR/SHAKEN support

VoxPria Compatibility:

• ✓ Inbound calls
• ✓ Outbound calls
• ✓ TLS encryption
• ✓ Emergency calling
• ✓ High reliability

Setup Configuration:
`

Provider: Generic

SIP Server: sip.bandwidth.com

Port: 5061 (TLS) or 5060 (TCP)

Transport: TLS (recommended)

Username: From Bandwidth credentials

Password: From Bandwidth credentials

`
Pricing:

• Phone numbers: $0.75-4/month
• Inbound: $0.003-0.009/min
• Outbound: Varies by destination
• Contact for enterprise pricing

Configuration Steps:

1. Create Bandwidth account
2. Order phone numbers
3. Set up SIP peer
4. Configure termination settings
5. Get authentication credentials
6. Create Generic trunk in VoxPria

Documentation:

• Bandwidth Voice API

Vonage (formerly Nexmo) #

Best For: Global connectivity with extensive API features
Overview:

Vonage offers a comprehensive communications platform with strong international presence and feature-rich APIs.

Key Features:

• Global phone number coverage
• Advanced API capabilities
• Voice API and SIP trunking
• Real-time analytics
• Compliance and security features
• 24/7 support

VoxPria Compatibility:

• ✓ Inbound calls
• ✓ Outbound calls
• ✓ TLS encryption
• ✓ Global numbers
• ✓ Call analytics

Setup Configuration:
`

Provider: Generic

SIP Server: sip.nexmo.com

Port: 5061 (TLS) or 5060 (TCP)

Transport: TLS (recommended)

Username: From Vonage API credentials

Password: From Vonage API credentials

`
Pricing:

• Phone numbers: Varies by country
• Per-minute charges vary by region
• Visit Vonage Pricing

Configuration Steps:

1. Sign up at Vonage
2. Purchase virtual numbers
3. Configure SIP settings
4. Create application for authentication
5. Get SIP credentials
6. Create Generic trunk in VoxPria

Documentation:

• Vonage SIP Documentation

Other Compatible Providers #

Flowroute #

Overview: US-focused provider with competitive rates
Key Features:

• US phone numbers
• Clean caller ID reputation
• Developer-friendly API
• Instant provisioning

Use Case: US-based businesses needing local numbers
Configuration: Use Generic SIP trunk type

Plivo #

Overview: Cloud communications platform with global reach
Key Features:

• International coverage
• Programmable voice
• SMS integration
• Competitive pricing

Use Case: Businesses needing global presence
Configuration: Use Generic SIP trunk type

SignalWire #

Overview: Modern CPaaS with advanced features
Key Features:

• Real-time communication
• Video capabilities
• WebRTC support
• Developer-focused

Use Case: Developers wanting cutting-edge features
Configuration: Use Generic SIP trunk type

Voxtelesys #

Overview: Wholesale carrier for high-volume users
Key Features:

• Wholesale pricing
• High capacity
• Custom SLAs
• Dedicated support

Use Case: High-volume enterprise deployments
Configuration: Use Generic SIP trunk type

Generic SIP Configuration #

For providers not listed above, use these steps:

Required Information #

Gather from your SIP provider:

• SIP Server Address (hostname or IP)
• Port Number (typically 5060 or 5061)
• Transport Protocol (TCP or TLS)
• Username for authentication
• Password for authentication

Configuration Steps #

1. In VoxPria, create new trunk
2. Select Generic as provider type
3. Enter provider’s SIP server address
4. Set port (5060 for TCP, 5061 for TLS)
5. Choose transport (TLS recommended)
6. Enter authentication credentials
7. Save trunk configuration

Testing Generic Setup #

1. Import a test phone number
2. Make inbound call to verify routing
3. Check call logs for any errors
4. Test audio quality
5. Verify agent connectivity

Choosing the Right Provider #

Decision Factors #

Budget:

• High volume: Consider Telnyx or wholesale providers
• Medium volume: Twilio or Bandwidth
• Low volume: Any provider works

Geography:

• US only: Flowroute, any US provider
• International: Twilio, Vonage, Telnyx
• Specific country: Check provider coverage

Features Needed:

• Basic calling: Any provider
• Advanced features: Twilio, Bandwidth
• Analytics: Providers with robust dashboards
• Compliance: Bandwidth, Twilio

Technical Requirements:

• TLS support: Most modern providers
• High concurrency: Enterprise providers
• API integration: Developer-focused platforms

Support Level:

• 24/7 support: Twilio, Bandwidth, Vonage
• Community support: Most providers
• Dedicated account manager: Enterprise plans

Comparison Matrix #

| Provider | Setup Ease | Cost | Features | Support | Global |
|———-|———–|——|———-|———|——–|
| ElevenLabs | ⭐⭐⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐ |
| OpenAI | ⭐⭐⭐⭐ | ⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐ |
| Twilio | ⭐⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ |
| Telnyx | ⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ |
| Bandwidth | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐⭐ |
| Vonage | ⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ |

Migration Between Providers #

Why Migrate? #

• Cost optimization
• Feature requirements change
• Better quality needed
• Geographic expansion
• Service issues with current provider

Migration Process #

1. Setup New Provider

• Create account with new provider
• Configure test trunk in VoxPria
• Test with single number

1. Parallel Run

• Keep old provider active
• Import some numbers to new provider
• Monitor performance comparison

1. Gradual Cutover

• Move numbers in batches
• Monitor call quality
• Keep old provider as backup

1. Complete Migration

• Move all remaining numbers
• Decommission old trunk
• Cancel old provider service

Port Numbers vs New Numbers #

Number Porting:

• Keep existing phone numbers
• Takes 7-14 days typically
• May have fees
• Maintains customer familiarity

New Numbers:

• Instant activation
• No porting fees
• Requires updating marketing
• Good for new campaigns

Best Practices #

Multi-Provider Strategy #

Consider using multiple providers for:

• Redundancy – Backup if one fails
• Cost Optimization – Different rates for different regions
• Feature Access – Use each provider’s strengths
• Load Distribution – Spread traffic

Provider Evaluation #

Test providers before full deployment:

1. Sign up for trial or small plan
2. Test call quality in your geography
3. Verify feature compatibility
4. Check support responsiveness
5. Review pricing for your volume
6. Test failover scenarios

Monitoring and Optimization #

• Track call quality metrics per provider
• Monitor costs monthly
• Review error rates in call logs
• Test periodically from different locations
• Keep provider documentation updated

Next Steps #

• Choose a provider that fits your needs
• Follow our Quick Start Guide for setup
• Review API Reference for automation
• Check Troubleshooting for common issues

Need Help Choosing? #

Contact VoxPria support for personalized provider recommendations based on:

• Your geographic location
• Expected call volume
• Budget constraints
• Feature requirements
• Technical capabilities

We’re here to help you find the perfect SIP provider for your voice AI needs!