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The H.223 and H.245 protocols are used between multimedia endpoints over a circuit switched network. These protocols are utilized after a call is connected between two endpoints indicating the call is a multimedia call. The IMG 2020 can detect an incoming SS7/ISDN multimedia call based on a specific octet contained in the SS7/ISDN SETUP message. If the call is considered an audio call, the message will be interworked as a normal ISDN/SS7 to SIP call. If however, the call is considered a multimedia call, a proprietary SIP Header can be added indicating it is a multimedia call and the added header will be interworked to the SIP side. The feature is enabled through a new header added to the SIP Headers object. Refer to the information below.
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