IMG 1010 - SIP 3PCC - Third Party Call Control
The IMG supports the establishment of a session by a third party "controller" such as an application server or a Session Border Controller (SBC) allowing the IMG to integrate with services like auto attendant, conferencing, and unified messaging.
Delayed Media:
The IMGÂ platform supports delayed media to allow interworking with third party call control applications (3PCC) in accordance with RFC 3725. Delayed media is implemented for inbound calls. The IMG accepts INVITE and RE-INVITE messages with or without SDP or with a held SDP. The IMG accepts SDP in the SIP ACK message.
RFC
RFC 3725- Best Current Practices for Third Party Call Control (3pcc) in the Session Initiation Protocol (SIP)
Benefits
Seamless IMG integration with SIP application servers, enabling the IMG to be part of a larger service set.
More robust inter-operability with other application-specific SIP devices such as for operator interaction, fax servers, media servers.
Avoid use of a front-end SIP device to delay media prior to SIP signaling reaching the IMG.
Diagram
