Hold

This sample call flow assumes that the IWF call is established and that the RTP/RTCP flow is already in progress. The hold button is pushed, and IP PBX A sends an empty TCS to the Oracle® Enterprise Session Border Controller . The Oracle® Enterprise Session Border Controller puts the called party on hold by sending an INVITE message with 0.0.0.0 SDP to the SIP side of the call. Using 0.0.0.0 as the media address effectively stops the media flow. This INVITE is acknowledged, and the Oracle® Enterprise Session Border Controller closes the channels on the H.323 side, halting the RTP/RTCP flow.

When the caller on the H.323 side takes the call off hold, it resumes with a TCS that the Oracle® Enterprise Session Border Controller receives and then translates on the SIP side as an INVITE with SDP. After that INVITE is acknowledged and received, the Oracle® Enterprise Session Border Controller opens logical channels on the H.323 side and RTP/RTCP flows resume.