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Local Number Portability (LNP) allows a customer the ability to transfer either an existing fixed line or mobile telephone number assigned by a local carrier and reassign it to another carrier. The IMG now supports taking the LNP data in the R-URI on the SIP leg and interworking it into the R-URI and ISUP MIME on the SIP-I leg. The IMG also supports taking the R-URI message from the SIP-I leg and interworking it into the R-URI message on the SIP leg. Feature F-5282 is by default always enabled and does not need any special configuration for it to function.
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The Call Flow below represents the interworking of LNP from both SIP to SIP-I and SIP-I to SIP. The call flow details a Video to Call is received from MSC A in SIP-I format. The IMG will receive the call and will add the LRN and NPDI parameters into the INVITE message sent out on the SIP leg to the Video Gateway. The Call Flow below references the Call Trace that is linked in the 'Call Trace Example' in next section.
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Call Trace Example:
Configuration:
There is no configuration required for Feature F-5282 LNP Handling for SIP-I. The feature by default is always enabled.
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