AudioCodes Mediant 500 MSBR, User Manual

Page: 418 / 1248

User's Manual 418 Document #: LTRT-10375
Mediant 500 MSBR
Parameter Description
Note: As RTP multiplexing has been defined by the WebRTC
standard as mandatory, the support is important for deployments
implementing WebRTC. For more information on WebRTC, see
WebRTC.
RTCP Feedback
sbc-rtcp-feedback
[IPProfile_SBCRTCPFeedback]
Enables RTCP-based feedback indication in outgoing SDPs sent
to the SIP entity associated with the IP Profile.
The parameter supports indication of RTCP-based feedback,
according to RFC 5124, during RTP profile negotiation between
two communicating SIP entities. RFC 5124 defines an RTP
profile (S)AVPF for (secure) real-time communications to provide
timely feedback from the receivers to a sender. For more
information on RFC 5124, see http://tools.ietf.org/html/rfc5124.
Some SIP entities may require RTP secure-profile feedback
negotiation (AVPF/SAVPF) in the SDP offer/answer exchange,
while other SIP entities may not support it. The device indicates
whether or not feedback is supported on behalf of the SIP entity.
It does this by adding an "F" or removing the "F" from the SDP
media line ('m=') for AVP and SAVP. For example, the following
shows "AVP" appended with an "F", indicating that the SIP entity
is capable of receiving feedback
m=audio 49170 RTP/SAVPF 0 96

[0] Feedback Off = (Default) The device does not send the
feedback flag ("F") in SDP offers/answers that are sent to the
SIP entity. If the SDP 'm=' attribute of an incoming message
that is destined to the SIP entity includes the feedback flag,
the device removes it before sending the message to the SIP
entity.

[1] Feedback On = The device includes the feedback flag
("F") in the SDP offer sent to the SIP entity. The device
includes the feedback flag in the SDP answer sent to the SIP
entity only if it was present in the SDP offer received from the
other SIP entity.

[2] As Is = The device does not involve itself in the feedback,
but simply forwards any feedback indication as is.
Note:

As RTCP-based feedback has been defined by the WebRTC
standard as mandatory, the support is important for
deployments implementing WebRTC. For more information
on WebRTC, see WebRTC.
Quality of Service
RTP IP DiffServ
rtp-ip-diffserv
[IpProfile_IPDiffServ]
Defines the DiffServ value for Premium Media class of service
(CoS) content.
The valid range is 0 to 63. The default is 46.
Note: The corresponding global parameter is
PremiumServiceClassMediaDiffServ.
Signaling DiffServ
signaling-diffserv
[IpProfile_SigIPDiffServ]
Defines the DiffServ value for Premium Control CoS content
(Call Control applications).
The valid range is 0 to 63. The default is 40.
Note: The corresponding global parameter is
PremiumServiceClassControlDiffServ.