> For the complete documentation index, see [llms.txt](https://docs.ixhello.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ixhello.com/ixhc/connections/outbound-call-ixhc-realtime-voice-twilio-configuration-steps.md).

# Outbound call-iXHC Realtime voice Twilio configuration steps

This is a guide to configure a Twilio phone number associated with an assistant created on iX Hello Customer to make outbound call and connect to Realtime voice application.

### **Create Elastic SIP Trunk** (For outbound calling) <a href="#create-elastic-sip-trunk-for-outbound-calling" id="create-elastic-sip-trunk-for-outbound-calling"></a>

Twilio Elastic SIP Trunking guide: [Elastic SIP Trunking | Twilio](https://www.twilio.com/docs/sip-trunking)

1. Go to **Elastic SIP Trunks** page: [Console | Twilio](https://console.twilio.com/us1/develop/sip-trunking/manage/trunks)
2. Click on Create new SIP-Trunk, give a friendly name and Click on Create button

<figure><img src="/files/aMXV0n3LNOYitzj3fwh6" alt=""><figcaption></figcaption></figure>

3. Enable following settings & click on Save button : **Secure Trunking, Call Transfer, Symmetric RTP**

<figure><img src="/files/58QIt8DXM4yBYTyfJIef" alt=""><figcaption></figcaption></figure>

4. Add **Termination SIP URI** and **IP Access Control Lists or Credential Lists** depending on the authentication required

<figure><img src="/files/22CyQaJzrO1fH6SZqS5Q" alt=""><figcaption></figcaption></figure>

5. Add **Disaster Recovery URL** on **Origination** settings

<figure><img src="/files/l6R8Sqm5wkpSwYJhcRtT" alt=""><figcaption></figcaption></figure>

6. Add an Existing Number for doing outbound calls

<figure><img src="/files/KzAKepOiN0WxFysuzCJk" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/zy7f9B3861TWKRyOjFna" alt=""><figcaption></figcaption></figure>

***

### **Create Programmable SIP Domain (For Realtime voice application)** <a href="#create-programmable-sip-domain-for-realtime-voice-application" id="create-programmable-sip-domain-for-realtime-voice-application"></a>

Twilio SIP guide: [Inbound - Sending SIP to Twilio | Twilio](https://www.twilio.com/docs/voice/api/sending-sip)

1. Go to **Programmable SIP Domains** page & click on Plus icon: [Console | Twilio](https://console.twilio.com/us1/develop/voice/manage/sip-domains)

<figure><img src="/files/YgYcYelGIqPzbLMyPbBd" alt=""><figcaption></figcaption></figure>

2. Add **FRIENDLY NAME** & **SIP URI**

<figure><img src="/files/meYrKLY3m5dFlkufYyLF" alt=""><figcaption></figcaption></figure>

3. Add **Voice Authentication** as required

<figure><img src="/files/30gGORd5ZFDZYI3H28x4" alt=""><figcaption></figcaption></figure>

4. Add a Webhook URL & select HTTP POST under **Call Control Configuration**. This is the TwiML Webhook URL for the iX Hello Customer Realtime voice application

<figure><img src="/files/AZKpEaOXtIVjDSJ8Ldbf" alt=""><figcaption></figcaption></figure>

5. Enable **Secure Media** & **SIP Registration**, add CREDENTIAL LISTS as needed and click **Save** button

<figure><img src="/files/vLOFRlZLjz1F39FQPIJt" alt=""><figcaption></figcaption></figure>

***

### Configure Elastic SIP Trunk & Programmable SIP Domain <a href="#configure-elastic-sip-trunk-and-programmable-sip-domain" id="configure-elastic-sip-trunk-and-programmable-sip-domain"></a>

Configure Elastic SIP trunk & Programmable SIP domain on communications infrastructure side depending on the setup.


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