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Feature F-5670 ISDN Facility Tunneling functions only after a call between ISDN and SIP is in the answered state. Once a call is in the answered state, the SIP INFO message can be used to transfer information from the SIP network, through the IMG and then to the ISDN network. Once the IMG receives the SIP information it looks for a proprietary header labeled X-DLGCIsdnTunnelingInfo in the format displayed below:

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