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Table of Contents
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With the introduction of the MAP ISDN Call Proceeding to SIP 183 functionality, the Call Proceeding message from the ISDN side will be interworked into a 183 Session Progress with SDP message when the value of the Progress Indicator parameter in the Call Proceeding message is either "1" or "8". By interworking these parameters, an early voice path can be established so the caller can hear a prompt played by the terminating endpoint. If no progress indicator is present or the value of the ISDN Progress Indicator is not "1" or "8" then the call will proceed as normal. The Call Proceeding message will be dropped and no SIP 183 Session Progress will be sent. Refer to the information below for more information.

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