Patent ID: 8788678
Filing Date: 2014-07-22
Classification: H04L

Abstract:
1. A method of handling IP Multimedia Public Identity registration within an IP Multimedia Subsystem network, the method comprising: receiving at a Call Session Control Function a SIP REGISTER message including a completed IP Multimedia Public Identity Attribute-Value-Pair and no IP Multimedia Private Identity; deriving at the Call Session Control Function an IP Multimedia Private Identity using the IP Multimedia Public Identity indicated in the completed IP Multimedia Public Identity Attribute-Value-Pair; sending a Cx query from the Call Session Control Function to a Home Subscriber Server, the query including said IP Multimedia Public Identity and the derived IP Multimedia Private Identity; at the Home Subscriber Server, identifying a subscription using the IP Multimedia Public Identity, determining that the derived IP Multimedia Private Identity is not associated with said subscription, identifying a default IP Multimedia Private Identity associated with said subscription, and returning a Cx response to said Call Session Control Function including said default IP Multimedia Private Identity; and at said Call Session Control Function, using the received, default IP Multimedia Private Identity to further handle said SIP REGISTER message.