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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.
.png "IP-PBX Gateway")
For more information, see Trusted domains and SIP gateways.