SIP

Twilio SIP Trunking

Attach Twilio Elastic SIP Trunks to Bolna voice agents for flexible call routing and worldwide PSTN access. Scalable SIP telephony with global coverage.

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At a glance

How Twilio SIP Trunking fits in the stack

Best for

Making and receiving real phone calls at production scale.

Use this layer when

You need numbers, trunking, call routing, or carrier control.

Connects to

STT, LLM, TTS, and workflow actions inside the live call.

Voice Stack

Telephony is the calling layer

This provider connects Bolna to the phone network. It controls how calls start, where they route, which numbers you use, and how the audio enters your agent pipeline.

TelephonyPhone Network

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STTListener

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LLMReasoning

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TTSVoice

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ToolsActions

This page focuses on where Twilio SIP Trunking fits in a production voice stack. For full setup steps, credentials, and API details, use the documentation link above.

Overview

Twilio Elastic SIP Trunking provides enterprise-grade SIP connectivity with global PSTN access. With Bolna's Twilio SIP integration, you can leverage Twilio's worldwide carrier network while maintaining flexibility with SIP-based call routing.

For generic SIP concepts and configuration basics, see our Generic SIP Trunk Guide.

Features & Use Cases

Global PSTN Access
Make and receive calls in 100+ countries through Twilio's carrier network.

Elastic Scaling
Automatically scale capacity up or down based on call volume, no need to pre-purchase channels.

IP Access Control
Secure your trunk with IP whitelisting and credential-based authentication.

Twilio Ecosystem Integration
Leverage other Twilio services (TaskRouter, Studio, Functions) alongside SIP trunking.

Use Case: Hybrid Cloud Communications
Integrate Bolna AI agents with existing Twilio infrastructure for unified communications.

Use Case: Global Call Routing
Route calls through optimal carriers based on destination for cost and quality optimisation.

Other providers in this layer

Telephony

Exotel

Connect Exotel to Bolna voice agents for reliable inbound and outbound calling across India. Trusted by enterprises handling high-volume phone operations.

Telephony

Plivo

Use Plivo telephony with Bolna voice agents for affordable inbound and outbound calling in India. Solid infrastructure with competitive per-minute rates.

Telephony

Twilio

Connect Twilio to Bolna for global phone coverage. Spin up local numbers in 100+ countries and route inbound or outbound calls to your AI voice agents.

Browse this layer

Keep exploring the voice stack

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Telephony

Telephony providers connect your voice agents to the phone network so they can make and receive real calls. Bolna supports managed integrations with major carriers as well as bring-your-own-carrier via SIP trunking, giving you full control over call routing, number provisioning, and cost.

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Large Language Models

The LLM is the brain of your voice agent. It understands what callers say and decides how to respond. Bolna lets you swap between models like GPT-4o, Claude, and DeepSeek without changing your agent configuration, so you can optimize for speed, cost, or reasoning depth.

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Speech-to-Text

Speech-to-text converts what callers say into text that your LLM can process. Transcription accuracy and latency directly affect how natural a conversation feels. Bolna supports streaming STT providers optimized for telephony audio, including specialized models for Indian languages.

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Text-to-Speech

Text-to-speech turns your agent responses into spoken audio. Voice quality shapes how callers perceive your brand. Flat, robotic speech kills trust while natural, expressive voices build it. Bolna integrates with the fastest TTS providers so responses sound human and arrive without awkward pauses.

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Tools & Workflows

Tools let your voice agents take action during a call, not just talk. Book a calendar slot, look up an order in Shopify, push a lead into your CRM, or trigger a multi-step automation in Zapier. These integrations turn voice agents from answering machines into workflow engines.

See where Twilio SIP Trunking fits in your production workflow

Use the demo to walk through provider selection, stack tradeoffs, and the exact workflow you want Bolna to automate.

Book a Demo Read Official Docs