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PSTN gateway and IP-PBX interoperability

  • Article

Applies to: Skype for Business 2015

For IP-based real-time applications that must communicate with a PSTN network on one side and a unified communications network on the other side, Microsoft Unified Communications Managed API 5.0 provides an application the ability to interoperate with SIP PSTN gateways and IP-PBXs with the unified communications network.

The following SIP peers can connect to the UCMA application:

  • SIP gateways.

  • SIP-enabled IP-PBXs that support the following phones:

    • SIP phones
    • Soft phones that support SIP

SIP peers should support the following protocols:

  • SIP—RFC 3261
  • DTMF—RFC4733
  • SDP—RFC 3264

In addition, SIP peers:

  • Must provide media session parameter negotiation (endpoint, codec, and, if applicable, encryption parameters) through SDP, as defined in the SIP and related RFCs and used in SIP.

  • Must provide media/audio transport using RTP/RTCP over UDP.

  • Must meet the Supported IP Gateways requirements listed in Telephony Advisor for Exchange 2010.

The following illustration shows a typical setup.

IP-PBX Gateway

For more information, see Trusted domains and SIP gateways.