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• Allows the SBC to establish calls for codecs that it does not support.
  
  
• Improves the calls per second (CPS) of SBC 1000/2000.
  
  
• RTP Proxy Relay calls do not use transcoding licenses (Enhanced Media Sessions with Transcoding). RTP Proxy Relay calls use no DSPs or SDP licensesonly use non-transcoding licenses (Enhanced Media Sessions without Transcoding).
  
  
• Improves call quality.
  
  
• Reduces internal call processing.
  

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• The voice metrics will be collected only in the DSP mode; audio metrics will not be collected for any call routed in the Proxy or Direct Media mode.
  
  
• Dynamic switching between DSP and Proxy modes is not supported. The RTP mode cannot be changed on a call once it has been selected.
  
  
• RTP Proxy Relay does not provide transcoding. Codec mismatches between endpoints will result in call failure.
  
  
• All Forked responses are sent to the caller. Endpoints may not handle it very well.
  
  
• In RTP Proxy Relay, the SRTP mandatory/optional, crypto keys, RTP payload packet size, order of codecs, are all negotiated by the endpoints.
  
  
• Calls will not work between endpoints that cannot create direct calls. (e.g., RTP Proxy Relay does not work between Lync client and Tenor).
  
  
• Transferred calls are not supported.
  
  
• Endpoint-to-endpoint issues, such as one-way audio and no audio, usually manifest as call failures.
  
  
• In RTP Proxy Relay, there is no support for local ring back, music on hold, etc. (these require a DSP).
  
  
• RTP Proxy Relay does not support communications between RTP and SRTP endpoints. RTP to SRTP requires DSP transcodingyou to configure the Audio Stream Mode as DSP.