User's Manual 758 Document #: LTRT-10532
Mediant 500L Gateway & E-SBC
3. Click Apply.
The device also supports media synchronization for call forking. If the active UA is the first
one to send the final response (e.g., 200 OK), the call is established and all other final
responses are acknowledged and a BYE is sent if needed. If another UA sends the first
final response, it is possible that the SDP answer that was forwarded to the INVITE-
initiating UA is irrelevant and thus, media synchronization is needed between the two UAs.
Media synchronization is done by sending a re-INVITE request immediately after the call is
established. The re-INVITE is sent without an SDP offer to the INVITE-initiating UA. This
causes the INVITE-initiating UA to send an offer which the device forwards to the UA that
confirmed the call. Media synchronization is enabled by the EnableSBCMediaSync
parameter.
39.7.3 Configuring Call Forking-based IP-to-IP Routing Rules
You can configure call forking routing rules in the IP-to-IP Routing table. This is done by
configuring multiple routing rules under a forking group. These rules send an incoming IP
call to multiple destinations of any type (e.g., IP Group or IP address). The device forks the
call by sending simultaneous INVITE messages to all the specified destinations. It handles
the multiple SIP dialogs until one of the calls is answered and then terminates the other
SIP dialogs. For more information, see ''Configuring SBC IP-to-IP Routing Rules'' on page
685.
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