# SIP Trunk Configuration Instruction with Twilio Elastic trunking

## Introduction

This article provides you with a step-by-step SIP Trunk Configuration of ProSBC with Twilio Elastic Trunking, using the Web Portal configuration tool. Complete the general installation configuration steps, before you begin configuring your specific scenario. In this guide FQDN is (telcobridges.pstn.twilio.com) configured in the Twilio console. You can find more details about how to create an Elastic Trunking in Twilio from the following link [Create and Configure Trunks](https://www.twilio.com/docs/sip-trunking#configure-trunks)

## Twilio Elastic SIP Trunk Example

<figure><img src="https://docs.telcobridges.com/w/images/thumb/a/ab/Twilio_Trunking.png/800px-Twilio_Trunking.png" alt=""><figcaption></figcaption></figure>

**Configuration Steps**

| <p>(Step 1)<br>Create IP Network</p>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | <p>(Step 2)<br>Create Protocol Stack</p>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | <p>(Step 3)<br>Create Call Route</p>                                                                                                          |
| ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------- |
| <ul><li><a href="../../configuration-by-web-portal-category/ip-network-settings/configuring-a-virtual-port">Configuring an IP Virtual Port</a></li><li><a href="../../configuration-by-web-portal-category/ip-network-settings/configuring-a-vlan">Configuring a VLAN</a></li><li><a href="../../configuration-by-web-portal-category/ip-network-settings/configuring-ip-interfaces">Configuring IP Interfaces</a></li><li><a href="../rtp-no-anchoring/parameter-allow-low-delay-media-relay/configuring-an-ip-port-range">Create an IP port range</a></li></ul> | <ul><li><a href="../rtp-no-anchoring/parameter-allow-low-delay-media-relay/configuring-an-ip-port-range">Create an IP port range</a></li><li><a href="../../configuration-by-web-portal-category/sip/creating-a-sip-stack">Create a SIP stack</a></li><li><a href="../../configuration-by-web-portal-category/sip/creating-a-sip-transport-server">Create a SIP transport server</a></li><li><a href="../rtp-no-anchoring/creating-profiles">Modify profile</a></li><li><a href="../../configuration-by-web-portal-category/network-access-points-nap">Allocate a SIP NAP</a></li></ul> | <ul><li><a href="../../configuration-by-web-portal-category/call-routing/creating-a-first-call-route">Create a first call route</a></li></ul> |

## NAP Configuration for Twilio Elastic Trunking

* See [Create SIP NAP](https://prosbcdocs.telcobridges.com/configuration-details/configuration-by-web-portal-category/network-access-points-nap)

In this example, we will use telcobridges.pstn.twilio.com trunk information

<figure><img src="https://docs.telcobridges.com/w/images/2/2d/Twilio_nap.png" alt=""><figcaption></figcaption></figure>

NOTE: Connection to Twilio Elastic SIP Trunking is available in multiple geographic edge locations. If you wish to manually connect to a specific geographic edge location that is closest to the location of your communications infrastructure, you may do so by pointing your communications infrastructure to any of the following localized Termination SIP URIs:

* {example}.pstn.ashburn.twilio.com (North America Virginia)
* {example}.pstn.umatilla.twilio.com (North America Oregon)
* {example}.pstn.dublin.twilio.com (Europe Ireland)
* {example}.pstn.frankfurt.twilio.com (Europe Frankfurt)
* {example}.pstn.singapore.twilio.com (Asia Pacific Singapore)
* {example}.pstn.tokyo.twilio.com (Asia Pacific Tokyo)
* {example}.pstn.sao-paulo.twilio.com (South America São Paulo)
* {example}.pstn.sydney.twilio.com (Asia Pacific Sydney)

[Click here for more information on Twilio Elastic SIP Trunking IP Addresses](https://www.twilio.com/docs/sip-trunking/ip-addresses)

* [Name](https://prosbcdocs.telcobridges.com/configuration-parameters-all#parameter-name)
* [Default Profile](https://prosbcdocs.telcobridges.com/configuration-parameters-all#parameter-default-profile)
* [Proxy Address](https://prosbcdocs.telcobridges.com/configuration-parameters-all#parameter-proxy-address)
* [Proxy Port Type](https://prosbcdocs.telcobridges.com/configuration-parameters-all#parameter-proxy-port-type)
* [Proxy Port](https://prosbcdocs.telcobridges.com/configuration-parameters-all#parameter-proxy-port)
* [Poll Remote Proxy](https://prosbcdocs.telcobridges.com/configuration-parameters-all#parameter-poll-remote-proxy)
* [Accept only authorized users](https://prosbcdocs.telcobridges.com/configuration-parameters-all#parameter-accept-only-authorized-users)

## Route Configuration for Twilio Elastic Trunking

* See [Create a first call route](https://prosbcdocs.telcobridges.com/configuration-details/configuration-by-web-portal-category/call-routing/creating-a-first-call-route)

In this example, we will create an outgoing and incoming routes for Twilio Elastic Trunk

### Route for outgoing to Twilio

<figure><img src="https://docs.telcobridges.com/w/images/5/5b/Route_2_twilio.png" alt=""><figcaption></figcaption></figure>

### Route for incoming from Twilio

<figure><img src="https://docs.telcobridges.com/w/images/c/c3/Route_from_twilio.png" alt=""><figcaption></figcaption></figure>

### List of Parameters

* [Name](https://prosbcdocs.telcobridges.com/configuration-parameters-all#parameter-name)
* [Routeset Name](https://prosbcdocs.telcobridges.com/configuration-parameters-all#parameter-routeset-name)
* [Called](https://prosbcdocs.telcobridges.com/configuration-parameters-all#parameter-called)
* [Calling](https://prosbcdocs.telcobridges.com/configuration-parameters-all#parameter-calling)
* [NAP](https://prosbcdocs.telcobridges.com/configuration-parameters-all#parameter-nap)
* [Remapped Called](https://prosbcdocs.telcobridges.com/configuration-parameters-all#parameter-remapped-called)
* [Remapped Calling](https://prosbcdocs.telcobridges.com/configuration-parameters-all#parameter-remapped-calling)
* [Remapped NAP](https://prosbcdocs.telcobridges.com/configuration-parameters-all#parameter-remapped-nap)
* [Source call leg remapped Profile](https://prosbcdocs.telcobridges.com/configuration-parameters-all#parameter-source-call-leg-remapped-profile)
* [Destination call leg remapped Profile](https://prosbcdocs.telcobridges.com/configuration-parameters-all#parameter-destination-call-leg-remapped-profile)

Custom Parameters

* [prio (or priority)](https://prosbcdocs.telcobridges.com/configuration-parameters-all#parameter-prio)
* [additonal\_naps](https://prosbcdocs.telcobridges.com/configuration-parameters-all#parameter-additonal-naps)
* [domain](https://prosbcdocs.telcobridges.com/configuration-parameters-all#parameter-domain)