User's Manual 576 Document #: LTRT-89730
Mediant 3000
Figure 28-8: Early Media RTP - SIP 18x with SDP
28.9.7 Interworking SIP re-INVITE Messages
The device supports interworking of SIP re-INVITE messages. This enables
communication between endpoints that generate re-INVITE requests and those that do not
support the receipt of re-INVITEs. The device does not forward re-INVITE requests to IP
Groups that do not support it. Instead, it sends a SIP response to the re-INVITE request,
which can either be a success or a failure, depending on whether the device can bridge the
media between the endpoints. The device can also handle re-INVITEs with or without an
SDP body, enabling communication between endpoints that do not support re-INVITE
requests without SDP, and those that require SDP. The device generates an SDP offer and
adds it to the incoming re-INVITE request if it does not contain an SDP and only then
forwards it to the destination endpoint. This interworking support is configured by the IP
Profile parameter, 'SBC Remote Reinvite Support'.
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