User's Manual 404 Document #: LTRT-27045
Mediant 1000B Gateway & E-SBC
Parameter Description
[2] Remove = Disable silence suppression for each relevant coder
listed in the SDP.
RTP Redundancy Mode
sbc-rtp-red-behav
[IpProfile_SBCRTPRedundan
cyBehavior]
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.
RTCP Mode
sbc-rtcp-mode
[IPProfile_SBCRTCPMode]
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
necessary when incoming RTCP is not compatible with the
destination SIP entity's (this IP Profile) RTCP support. In such a
scenario, the device can generate the RTCP and send it to the SIP
entity.
[0] Transparent = (Default) RTCP is forwarded as is (unless
transcoding is done, in which case, the device generates RTCP
on both legs).
[1] Generate Always = Generates RTCP packets during active
and inactive (e.g., during call hold) RTP periods (i.e., media is
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