AudioCodes Mediant 1000B - Page 437

Version 7.2 437 Mediant 1000B Gateway & E-SBC
User's Manual 20. Coders and Profiles
Parameter Description
SDP with 'a=rtcp', for example:
m=audio 49170 RTP/AVP 0
a=rtcp:53020 IN IP6
2001:2345:6789:ABCD:EF01:2345:6789:ABCD
 [0] Don't Care = (Default) The device forwards the SDP as is
without interfering in the RTCP attribute (regardless if present or
not).
 [1] Add = The device adds the 'a=rtcp' attribute to the outgoing
SDP offer sent to the SIP entity if the attribute was not present in
the original incoming SDP offer.
 [2] Remove = The device removes the 'a=rtcp' attribute, if present
in the incoming SDP offer received from the other SIP entity,
before sending the outgoing SDP offer to the SIP entity.
RTCP Feedback
sbc-rtcp-feedback
[IPProfile_SBCRTCPFeedbac
k]
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.
Quality of Experience
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.