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Table of Contents
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The SIP_ISDN Interworking object is used to interwork the Call Proceeding message from the ISDN side to the 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. If the feature is not configured, interworking the ISDN Call Proceeding message to the SIP leg is based on <draft-kotar-sipping-dss1-sip-iw-01.txt> section 7.3.2. The receipt of a DSS1 CALL PROCEEDING message SHALL NOT result in any SIP message being sent.

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