How to route calls to your SIP network with an outbound call

1. Buy a Twilio Number
2. Configure SIP Registration
3. Configure your SIP Endpoint
4. Make an outbound SIP call

Let's get started!

In the Twilio console, search for and purchase an available phone number capable of making outbound calls. You'll use this phone number as the "From" phone number when you initiate an outbound call.

Endpoint , Username (this can be E164 number, Extention number or name) as UserA and Password as yourpassword and click Create. Note: The credential username and password created here will be used on your SIP Endpoints for authentication.

Configure SIP Domain

1. Select " Domains "
2. Click the "+" icon to create SIP Domain .
3. Add a Friendly Name as T1 and a unique SIP URI as Trunk1 . Note: SIP URI names needs to be unique, I have used Trunk1 in my example. You might have to find a name that is available
4. Scroll down to "Voice Authentication" and associate the "Credential Lists" Endpoint that you created
5. Scroll down to "SIP Registration" and click "Enabled"
6. In "SIP Registration Authentication" associate the "Credential Lists" that you created. Then click "Save"

Note: If you are not using Twilio Registered Endpoint then this step is not applicable to you.

A SIP Endpoint can be desk phone or soft phone. In this guide, we will use the soft phone and will configure the phone to successfully register to SIP Registrar.

1. Download and install SIP Endpoint. Zoiper is used for example

2. Provide login name - UserA@Trunk1.sip.us1.twilio.com (do add us1 region parameter to your sip domain) and password

   • Username and password from Credential List Username
   • Yourdomain from SIP Domains . For example, Trunk1.sip.us1.twilio.com (do add us1 region parameter to your sip domain while configuring zoiper)
3. Click "Next/continue" to confirm the Domain
4. Optional settings can be skipped
5. Done! You see in Zoiper that it is "Registered" and has "Tick" next to your login name.
6. You can also verify the successfully registered endpoints under your SIP domain > Registered SIP Endpoints in the Twilio console

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<?xml version="1.0" encoding="UTF-8"?>

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<Response>

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<Say>Welcome to xyz.com. Your call will be routed to an agent now</Say>

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<Dial>

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<Sip>sip:UserA@Trunk1.sip.us1.twilio.com</Sip>

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</Dial>

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</Response>

(information)

Info

Make sure to add us1 region parameter as part of your SIP domain

With our TwiML Bin created, now we need to wire it up to our number.

1. Go to your Twilio Number page
2. Click the Number you have purchased
3. Scroll down to "Voice" under "A Call Comes in" select your configured TwiML Bin as SIP Outbound call from the dropdown menu and click "Save"

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