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Panel

In this section:

Table of Contents
maxLevel3

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  • Use RTP Proxy Relay Mode when the two endpoints use a codec which is not supported by the SBC. 
    • Proxy Mode permits the endpoints to directly negotiate the codec between themselves without the SBC interfering. In other words, if the endpoints would be able to make a direct call to each other, then RTP Proxy Relay Mode should permit the endpoints to make a call through the SBC.

  • Proxy Mode may also be used in cases where the SBC does support the codecs used by the two endpoints.
    • Calls in Proxy Mode will not receive transcoding, ringback, or music-on-hold support from the SBC.  These features require a DSP.
Warning

It is advisable to use DSP mode when the call codec is one which is supported by the SBC.  Doing so will decrease installation and interoperability problem.


Warning

Do not use Proxy Mode for Skype for Lync Business/Teams calls.   Lync Skype for Business/Teams calls require that the SBC provide ringback.

 


Advantages of Using RTP Mode

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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 Skype for Business/Teams 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 you to configure the Audio Stream Mode as DSP.

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