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titleRelated Articles

SDP Transparency

Session Description Protocol (SDP) is a set of rules defining how multimedia sessions are set up to allow all end points to effectively participate in the session.

Interactive Connectivity Establishment (ICE) is a protocol used by systems that cannot determine their own transport address as seen from the remote end, but that can provide several possible alternatives (see ICE-Lite Support). The SDP transparency feature allows SDP and ICE media to pass through the 

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as-is to the far end.

SDP Transparency functionality includes:

  • All unknown SDP attributes are transparently passed.
  • All unknown components of known SDP attributes are dropped.
  • Any unknown audio codecs are dropped.
  • All known and unknown video codecs are transparently passed.

Note

When SDP Transparency is enabled, all IP Signaling Profile SDP-related flags are overridden.

For additional audio/video support topics, see:

Suppressing 183 Response Without SDP

The

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supports suppressing the 183 response without SDP upon receipt of 3xx Redirect response for reasons such as:

  • An endpoint perceives a 183 without SDP response as being an extra message resulting in unexpected behavior.

  • Endpoints that behave irregularly upon receipt of a 183 without SDP response prior to cut-through.

Two IP Signaling Profile ingress flags are available to configure the SBC to suppress 183 response without SDP:

  • suppress183For3xxRedirectResponse

  • suppress183WithoutSdp

Code Block
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titleCLI Syntax
% set profiles signaling ipSignalingProfile <SIP profile name> ingressIpAttributes flags suppress183For3xxRedirectResponsek <disable | enable>
% set profiles signaling ipSignalingProfile <SIP profile name> ingressIpAttributes flags suppress183WithoutSdp <disable | enable>

The following table describes the effects of enabling/disabling these flags.

Caption
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1Suppress 183 Response Without SDP Flags

Suppress 183 for 3xx Redirect Response

Suppress 183 without SDP

Action

Enabled

Enabled

  • If 183 without SDP is due to 3xx redirect response, it is suppressed due to “Suppress 183 for 3xx Redirect Response” flag.

  • If 183 without SDP is triggered for reason other than 3xx redirect response, it is suppressed due to “Suppress 183 without SDP ” flag.

Enabled

Disabled

3xx redirect response triggers 183 without SDP, and hence is suppressed

Disabled

Enabled

A '183 without SDP triggered due to 3xx redirect response' (or for any other reason) is suppressed.

Disabled

Disabled

Existing behavior persists.

For configuration details, see ingressIpAttributes - SIP - CLI or Ip Signaling Profile - Ingress Ip Attributes (EMA).

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