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Overview of interoperability of Azure Communications Gateway with Zoom Phone Cloud Peering

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Azure Communications Gateway can manipulate signaling and media to meet the requirements of your networks and the Zoom Phone Cloud Peering program. This article provides an overview of the interoperability features that Azure Communications Gateway offers for Zoom Phone Cloud Peering.

Important

You must be a telecommunications operator to use Azure Communications Gateway.

Role and position in the network

Azure Communications Gateway sits at the edge of your fixed networks. It connects these networks to Zoom servers, allowing you to support the Zoom Phone Cloud Peering program. The following diagram shows where Azure Communications Gateway sits in your network.

Architecture diagram for Azure Communications Gateway for Microsoft Teams Direct Routing.

You provide a trunk towards Zoom (via Azure Communications Gateway) for your customers. Calls flow from Zoom clients through the Zoom servers and Azure Communications Gateway into your network. SIP trunks between your network and Azure Communications Gateway are multitenant, meaning that traffic from all your customers shares the same trunk..

You must provision Azure Communications Gateway with the details of the numbers that you upload to Zoom. This provisioning allows Azure Communications Gateway to route calls correctly. For more information, see Identifying Zoom calls.

Azure Communications Gateway doesn't support Premises Peering (where each customer has an eSBC) for Zoom Phone.

SIP signaling

Azure Communications Gateway automatically interworks calls to support the requirements of the Zoom Phone Cloud Peering program, including:

  • Early media.
  • 180 responses without SDP.
  • 183 responses with SDP.
  • Strict rules on normalizing headers used to route calls.
  • Conversion of various headers to P-Asserted-Identity headers.

You can arrange more interworking function as part of your initial network design or at any time by raising a support request for Azure Communications Gateway. For example, you might need extra interworking configuration for:

  • Advanced SIP header or SDP message manipulation.
  • Support for reliable provisional messages (100rel).
  • Interworking away from inband DTMF tones.

SRTP media

The Zoom Phone Cloud Peering program requires SRTP for media. Azure Communications Gateway supports both RTP and SRTP, and can interwork between them. Azure Communications Gateway offers further media manipulation features to allow your networks to interoperate with the Zoom servers.

Media handling for calls

Azure Communications Gateway can use Opus, G.722 and G.711 towards Zoom servers, with a packetization time of 20 ms. You must select the codecs that you want to support when you deploy Azure Communications Gateway.

If your network can't support a packetization time of 20 ms, you must contact your onboarding team or raise a support request to discuss your requirements for transrating (changing packetization time).

Media interworking options

Azure Communications Gateway offers multiple media interworking options. For example, you might need to:

  • Control bandwidth allocation.
  • Prioritize specific media traffic for Quality of Service.

For full details of the media interworking features available in Azure Communications Gateway, raise a support request.

Identifying Zoom calls

You must provision Azure Communications Gateway with all the numbers that you upload to Zoom and indicate that these numbers are enabled for Zoom service. This provisioning allows Azure Communications Gateway to route calls to and from Zoom. It requires using Azure Communication Gateway's Number Management Portal (preview) or Provisioning API (preview).

Important

If numbers that you upload to Zoom aren't configured on Azure Communications Gateway, calls involving those numbers fail.

Configure test numbers for Zoom Phone Cloud Peering with Azure Communications Gateway explains how to set up test numbers for integration testing. You will need to follow a similar process for real customer numbers.

Optionally, you can indicate to your network that calls are from Zoom by:

  • Using the Number Management Portal or Provisioning API to add a header to calls associated with Zoom numbers.
  • Configuring Zoom to add a header with custom contents to SIP INVITEs (as part of uploading numbers to Zoom). For more information on this header, see Zoom's Zoom Phone Provider Exchange Solution Reference Guide.

Next steps