SIP User's Manual
864
Document #: LTRT-12804
Mediant 800 MSBG
Parameter
Description
is as follows:
9
Identifying a No Media Anchoring call, according to
configuration and the call’s properties (such as
source, destination, IP Group, and SRD).
9
Handing the identified No Media Anchoring call.
You can enable No Media Anchoring per SRD, where
calls between two user agents that pertain to the same
SRD (source and destination) are handled as a No Media
Anchoring (direct media) call.
No Media Anchoring calls cannot operate simultaneously
with the following SBC features: Force transcoding,
Extension Coders. Once No Media Anchoring is identified,
these features are disabled.
The Coder Restriction feature operates simultaneously
with No Media Anchoring calls. Restricted coders are
removed from the SDP offer message.
Chosen configuration can’t handle call from any user
agent to a foreign user agent (vice versa) but both user
agents belong to the same SRD and parameter
IntraSRDMediaAnchoring for that specific SRD is > 0.
When this parameter is disabled, No Media Anchoring
calls between two user agents that belong to separate
SRD’s cannot be configured. No Media Anchoring calls
between two user agents that belong to the same SRD is
configurable only (in this case).
[SBCMediaSecurityBehaviour]
The device supports transcoding between SRTP and RTP.
The device can also enforce SBC legs to use SRTP\RTP,
using the IP Profile parameter SBCMediaSecurityBehaviour:
[0]
As is (default): no special handling for RTP\SRTP is
done.
[1]
SRTP: SBC legs negotiate only SRTP media lines,
and RTP media lines are removed from the incoming SDP
offer\answer.
[2]
RTP: SBC legs negotiate only RTP media lines, and
SRTP media lines are removed from the incoming
offer\answer.
[3]
Both: each offer\answer is extended (if not already) to
two media lines - one RTP and the other SRTP.
If two SBC legs (after offer\answer negotiation) use different
security types (i.e., one RTP and the other SRTP), then the
device performs RTP-SRTP transcoding. To transcode
between RTP and SRTP, the following prerequisites must be
met:
At least one supported SDP "crypto" attribute and
parameters
EnableMediaSecurity must be set to 1
If one of the above transcoding prerequisites is not met, then:
any value other than “As is” is discarded.
if the incoming offer is SRTP, force transcoding, coder
transcoding, and DTMF extensions are not applied.
Transcoding between RTP and SRTP does not require any
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