AudioCodes MSBG Series User Manual

Version 7.2 635 Mediant 1000B Gateway & E-SBC
User's Manual 28. SBC Overview
bridge the media between the endpoints. The handling of UPDATE messages is configured
by the IP Profile parameter 'SBC Remote Update Support'.
28.9.9 Interworking SIP re-INVITE to UPDATE
The device enables communication between endpoints (IP Groups) that do not support re-
INVITE requests but support the UPDATE method, and vice versa. The device translates
the re-INVITE request to the UPDATE request, and vice versa. Note that if a re-INVITE
request arrives without SDP, the device generates the SDP and adds it to the outgoing
UPDATE request. To enable this feature, each IP Group needs to be configured with its
unique capabilities by associating it with a relevant IP Profile. For example, an IP Group
that supports UPDATE requests but not re-INVITEs would be configured as follows:

SBCRemoteUpdateSupport = 2 (Supported)

SBCRemoteReinviteSupport = 0 (Not Supported)
If a re-INVITE request needs to be forwarded to this IP Group, it is translated to an
UPDATE request.
28.9.10 Interworking Delayed Offer
The device supports interworking of INVITE messages with and without SDP between SIP
entities. The device enables sessions between endpoints (IP Groups) that send INVITEs
without SDP (i.e., delayed media) and those that do not support the receipt of INVITEs
without SDP. The device creates an SDP and adds it to INVITEs that arrive without SDP.
This intervention in the SDP offer-answer process may require transcoding. Delayed offer
is also supported when early media is present.
Employing IP Profiles, you can configure this interworking feature per SIP entity, using the
'SBC Remote Delayed Offer Support' parameter (see ''Configuring IP Profiles'' on page
393).
Note:For SIP entities that do not support delayed offer, you must assign extension
coders to its IP Profile (using the 'Extension Coders' parameter).
28.9.11 Interworking Call Hold
The device supports the interworking of call hold / retrieve requests between SIP entities
supporting different call hold capabilities:

Interworking SDP call hold formats. This is configured by the IP Profile parameter,
'SBC Remote Hold Format'.

Interworking the play of the held tone for IP entities that cannot play held tones locally.
This is configured by the IP Profile parameter, 'SBC Play Held Tone'.

Interworking generation of held tone where the device generates the tone to the held
party instead of the call hold initiator. This is configured by the IP Profile parameter,
'SBC Reliable Held Tone Source'.
To configure IP Profiles, see ''Configuring IP Profiles'' on page 393.

AudioCodes MSBG Series Specifications

General

Brand	AudioCodes
Model	MSBG Series
Category	Gateway
Language	English