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Overall, the configuration of the Signaling Group’s Audio/Fax Stream Proxy and DSP Modes controls which modes are available to the endpoints.   The call route controls which modes can be used for calls between specific endpoints.

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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 Ribbon recommends using 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 Business/Teams calls. Skype for Business/Teams calls require that the SBC provide ringback.


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  • Allows the SBC to establish calls for codecs that it does not support.

  • Improves Increases 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 only use non-transcoding licenses (Enhanced Media Sessions without Transcoding).

  • Improves call quality.

  • Reduces internal call processing.
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  • Call routes will default the Audio/Fax Stream Mode setting to DSP.   This mode should be used unless you have a specific reason for not using the SBC’s on-board DSP resources.

  • Configure the call route Audio/Fax Stream Mode to Proxy if:
    • If the The SBC does not have DSPs. 
    • The endpoints share a common codec that the SBC does not support. 
    • It may also be used for situations where the endpoints and the SBC all support a common codec, but for specific reasons, use of the on-board DSP resources is not desired. Be aware that the endpoints or upstream devices are responsible for providing ringback.

  • Use thecall route Proxy Preferred over DSP configuration:
    • In an environment where the Signaling Groups have a mixture of Audio/Fax Stream Mode configurations and the RTP Proxy Relay mode is the desired preference. This will permit the call route to prefer the Proxy mode over DSP mode based upon the combination of Stream Mode settings in the ingress and egress Signaling Groups.

  • Use thecall route DSP Preferred over Proxy configuration:

    • In an environment where the Signaling Groups have a mixture of Audio/Fax Stream Mode configurations and DSP mode is the desired preference. This will permit the call route to prefer the DSP mode over  over the Proxy mode based upon the combination of Stream Mode settings in the ingress and egress Signaling Groups.

      Info

      Note that if inbound and outbound SG don’t have common media mode, the call will be rejected in any media mode of operation defined in the routing entry.


  • Once the media mode is determined, the call will be set to either DSP or RTP Proxy Relay mode.   The media mode cannot be changed once it has been initially established.

  • If RTP Proxy Relay mode is desired, RTP Proxy Preferred mode should be used in configurations where a call route can be used by different call types (calls that are not exclusively SIP-to-SIP).

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