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The Connected Number parameter is an ISDN parameter found in the Connect message. It is used to implement the Connected Line Identification Presentation (COLP) supplementary service. The Connected Number parameter is sent in the backward direction to identify the number that is connected to a call. Because of potential changes in a call such as call redirection and call transfers, the connected number parameter may be different than the called party number. This feature interworks the connected number parameter between the SIP and ISDN protocols. Refer to the Call Flows below.
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