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To create or modify an Entry to a Call Routing Table:

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Media Mode enables you to choose how the SBC handles call signaling and Video/Application media stream during a call.

Proxy. The SBC will proxy the media stream between endpoints. The media flows through the SBC without requiring DSP resources. For example, this mode is used when an inbound SIP call includes Video/Application streams and both inbound and outbound SIP Signaling Groups are enabled for Proxy mode. If one Signaling Group has Proxy mode disabled, the stream is disabled. If the outbound Signaling Group is TDM, the call will be connected using Audio/Fax media only and Video/Application media stream will be rejected.    

Direct: The SBC media flows directly between compatible end-points without using either the SBC processor or a DSP resource.

Disabled. The Video/Application Stream Mode is disabled. The SBC will not proxy or switch media stream between endpoints.

Proxy SRTP Handling

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Note

Available for SBC SWe only.

Info

SIP Media Session and SIP Proxy Media Encryption licenses are required for this functionality.

The Proxy SRTP Handling option applies SRTP media encryption to a call; this enables communication between end points that are SRTP incompatible. For example, this enables communication if both Calling and Called user agents both support G.711u codec, but they differ in SRTP capability, or one party in the call does not support SRTP at all. Valid entries: Relay or Local. Default: Relay.

This field is displayed only when Proxy, DSP preferred over Proxy, or Proxy preferred over DSP is selected from the Audio Stream Mode drop down list.

Relay: When Relay is selected, the following options are supported:

  • For Proxy. Proxy or switches the media stream between endpoints.
  • For DSP Preferred over Proxy. Uses DSP resources, rather than proxy or switch the media stream between endpoints.
  • Proxy deferred over DSP. Proxies the media stream between endpoints rather than choosing DSP mode.

Local: When Local is selected, SRTP is negotiated automatically for the following: 

  • Proxy local SRTP. Proxies or switches the media stream between endpoints using SRTP media encryption on a call leg basis.
  • DSP Preferred over Proxy local SRTP. Uses DSP resources in addition to SRTP media encryption, rather than proxy or switch the media stream between endpoints..
  • Proxy Local SRTP over DSP. Proxies the media stream between endpoints rather than choosing DSP mode and uses SRTP media encryption).

Media Transcoding

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Specifies whether or not to use media transcoding.

Media Transcoding requires a specific Transcoding License. Do not enable Media Transcoding unless your calling configuration requires it and 

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is licensed for the Transcoding feature.

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