AudioCodes Mediant 3000

User's Manual 422 Document #: LTRT-89730
Mediant 3000
Parameter Description
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] Disable = (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] Enable = The device includes the feedback flag ("F") in the
SDP offer that is 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.
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.
Direct Media Tag
[IPProfile_SBCDirectMediaTag]
Defines an identification tag for enabling direct media (no Media
Anchoring) for the SIP entity associated with the IP Profile. Direct
media occurs between all endpoints whose IP Profiles have the
same tag value (non-empty value). For example, if you set the
parameter to "direct-rtp" for two IP Profiles "IP-PBX-1" and "IP-
PBX-2", the device employs direct media for calls amongst
endpoints associated with IP Profile "IP-PBX-1", for calls amongst
endpoints associated with IP Profile "IP-PBX-2", and for calls
between endpoints associated with IP Profile "IP-PBX-1" and IP
Profile "IP-PBX-2".
The valid value is a string of up to 16 characters. By default, no
value is defined.
For more information on direct media, see Direct Media on page
559.