what are the requirements to connect to third party sip from azure communication services

Question

use case for us is that we will initiate the call from app via the azure communication sdk implemented in the app and we need to connect to 3rd party sip .I am not sure how to achieve this .what all settings i need to configure in azure communication services . and what details i need to request from 3rd party service provider.

any assistance will be greatly appreciated

Thanks in advance

Answer 1

There are two ways to connect Azure Communication Services to a third-party SIP:

• Voice Calling (PSTN)
• Azure direct routing

Voice Calling (PSTN)

This is a simple way to add PSTN connectivity to your app or service, with Microsoft serving as your telco provider. You can call phones all over the world by purchasing numbers directly from Microsoft. Because Voice Calling (PSTN) operates through Azure Communication Services, no on-premises deployment is required. If necessary, you can connect a supported Session Border Controller (SBC) via Azure direct routing to achieve interoperability with third-party PBXs, analog devices, and other telephony equipment supported by the SBC. Outbound calls with this option are charged at per-minute rates based on the destination country.

Azure direct routing

You can use this option to connect your own supported SBC to Azure Communication Services without the need for additional on-premises software. With Communication Services, you can use virtually any telephony carrier. You, your carrier, or your partner can configure and manage this option. It also allows you to configure interoperability between your telephony equipment and Communication Services, such as a third-party PBX and analog devices. This option necessitates an uninterrupted connection to Azure, the deployment and maintenance of a supported SBC, and a contract with a third-party carrier unless it is used to connect to third-party PBX, analog devices, or other telephony equipment for Communication Services users. ​

Answer 2

Follow-up Response

When connecting Azure Communication Services to a third-party SIP, you must typically obtain the following information from the third-party service provider:

SIP server address

SIP server port

SIP username and password

The transport protocol (UDP, TCP, and TLS are all options.)

Without going through PSTN or Direct Routing, Azure Communication Services did not directly support third-party SIP connections. This may have changed, so check the official Azure Communication Services documentation or contact Azure support for the most up-to-date information.

Answer 3

To connect to a third-party SIP service from Azure Communication Services, you will need to obtain the following details from the third-party SIP service provider:

• SIP URI: This is the unique identifier for the SIP service. It typically takes the form of sip:username@domain.com.
• IP address: This is the IP address of the SIP service.
• Port number: This is the port number used by the SIP service.
• Authentication details: Depending on the requirements of the third-party SIP service, you may need to provide authentication details such as a username and password.

Once you have obtained these details, you can configure a custom SIP trunk in Azure Communication Services to connect to the third-party SIP service. Here are the steps to configure a custom SIP trunk in Azure Communication Services:

1. In the Azure portal, navigate to your Communication Services resource.
2. Click on "SIP Trunk Configuration" in the left-hand menu.
3. Click on "Add" to create a new SIP trunk configuration.
4. Enter a name for the SIP trunk configuration.
5. Enter the SIP URI, IP address, and port number for the third-party SIP service.
6. If authentication is required, enter the authentication details.
7. Click "Save" to create the SIP trunk configuration.

Once you have created the SIP trunk configuration, you can use the Azure Communication Services SDK to initiate calls from your app and connect to the third-party SIP service using the custom SIP trunk you configured in Azure Communication Services.

Sources that I used to piece together the above answer and can provide you further reading on ACS and SIPs:

• Quickstart: Add voice calling to your app
• QuickStart: Add 1:1 video calling as a Teams user to your application
• Calling SDK overview

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