# 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.

## 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.

## 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](/content/integrations/sip-generic/index.html).

## 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**](/content/integrations/exotel/index.html)  
Connect Exotel to Bolna voice agents for reliable inbound and outbound calling across India. Trusted by enterprises handling high-volume phone operations.  
[Telephony **Plivo**](/content/integrations/plivo/index.html)  
Use Plivo telephony with Bolna voice agents for affordable inbound and outbound calling in India. Solid infrastructure with competitive per-minute rates.  
[Telephony **Twilio**](/content/integrations/twilio/index.html)  
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.

## 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](/content/meet/index.html) [Read Official Docs](https://www.twilio.com/docs/sip-trunking)