AudioCodes Mediant 800B User Manual page 415

User's Manual
Parameter
sbc-preferred-ptime
[IpProfile_SBCPreferredPTi
me]
Use Silence Suppression
sbc-use-silence-supp
[IpProfile_SBCUseSilenceSu
pp]
RTP Redundancy Mode
sbc-rtp-red-behav
[IpProfile_SBCRTPRedunda
ncyBehavior]
RTCP Mode
sbc-rtcp-mode
Version 7.2
above) is set to Preferred Value.
The valid range is 0 to 200. The default is 0 (i.e., preferred ptime is not
used).
Defines silence suppression support for the SIP entity associated with
the IP Profile

[0] Transparent = (Default) Forward as is.

[1] Add = Enable silence suppression for each relevant coder listed
in the SDP.

[2] Remove = Disable silence suppression for each relevant coder
listed in the SDP.
Enables interworking RTP redundancy negotiation support between
SIP entities in the SDP offer-answer exchange (according to RFC
2198). The parameter defines the device's handling of RTP
redundancy for the SIP entity associated with the IP Profile. According
to the RTP redundancy SDP offer/answer negotiation, the device uses
or discards the RTP redundancy packets. The parameter enables
asymmetric RTP redundancy, whereby the device can transmit and
receive RTP redundancy packets to and from a specific SIP entity,
while transmitting and receiving regular RTP packets (no redundancy)
for the other SIP entity involved in the voice path.
The device can identify the RTP redundancy payload type in the SDP
for indicating that the RTP packet stream includes redundant packets.
RTP redundancy is indicated in SDP using the "red" coder type, for
example:
a=rtpmap:<payload type> red/8000/1
RTP redundancy is useful when there is packet loss; the missing
information may be reconstructed at the receiver side from the
redundant packets.

[0] As Is = (Default) The device does not interfere in the RTP
redundancy negotiation and forwards the SDP offer/answer
(incoming and outgoing calls) as is without interfering in the RTP
redundancy negotiation.

[1] Enable = The device always adds RTP redundancy capabilities
in the outgoing SDP offer sent to the SIP entity. Whether RTP
redundancy is implemented depends on the subsequent incoming
SDP answer from the SIP entity. The device does not modify the
incoming SDP offer received from the SIP entity, but if RTP
redundancy is required, it will be supported. Select the option if the
SIP entity requires RTP redundancy.

[2] Disable = The device removes the RTP redundancy payload (if
present) from the SDP offer/answer for calls received from or sent
to the SIP entity. Select the option if the SIP entity does not support
RTP redundancy.
Note:

To enable the device to generate RFC 2198 redundant packets,
use the IPProfile_RTPRedundancyDepth parameter.

To configure the payload type in the SDP offer for RTP
redundancy, use the RFC2198PayloadType.
Defines how the device handles RTCP packets during call sessions
for the SIP entity associated with the IP Profile. This is useful for
interworking RTCP between SIP entities. For example, this may be
415
19. Coders and Profiles
Description
Mediant 800B Gateway & E-SBC