Session establishment using one multimedia telephony (MMTEL) application server

摘要

According to a first aspect of the present invention there is provided a method of handling an IP Multimedia Subsystem, IMS, session establishment request received from a calling party at a Multimedia Telephone Application Server, MMTel AS, within an IMS network from a Serving Call Session Control Function, S-CSCF, over an IMS Service Control, ISC, interface. The method comprises, within the MMTel AS: a) determining that said request is an originating call case request; b) establishing a first Multimedia Telephone, MMTel, service engine instance within the MMTel AS and using that first MMTel service engine instance to handle the request according to an originating call case; c) determining whether or not a called party associated with said request is served by said MMTel AS and, if so, establishing a second MMTel service engine instance within the MMTel AS, passing the request to said second MMTel service engine instance, and using the second MMTel service engine instance to handle the request according to a terminating call case; and d) forwarding said IMS session establishment request over said ISC interface to said S-CSCF, or to another S-CSCF serving the called party.

主权项

1. A method at a Multimedia Telephony Application Server, MMTel AS, configured for operation in an IP Multimedia Subsystem, IMS, network, said method comprising:
receiving an IMS session establishment request originating from a calling party, said IMS session establishment request received at the MMTel AS over an IMS Service Control, ISC, interface, from a Serving Call Session Control Function, S-CSCF, associated with the calling party; determining that the IMS session establishment request is an originating call case; establishing a first Multimedia Telephony, MMTel, service engine instance within the MMTel AS and using the first MMTel service engine instance to handle the request according to the originating call case; determining that a called party associated with the IMS session establishment request is served by the MMTel AS and in response:
establishing a second MMTel service engine instance within the MMTel AS;passing the IMS session establishment request within the MMTel AS to the second MMTel service engine instance, andusing the second MMTel service engine instance to handle the request according to a terminating call case; and forwarding the IMS call session establishment request over the ISC interface to the S-CSCF associated with the called party, if known, and otherwise to the S-CSCF associated with the calling party; wherein the step of determining that the called party is served by the MMTel AS is performed responsive to determining that no further Initial Filter Criteria, IFC, triggering is required with respect to the calling or called party, such that the corresponding sub-steps of establishing, passing to and using the second MMTel service engine instance are performed responsive to determining that no further IFC triggering is required; wherein the MMTel AS receives in respect of the calling and or called party an indication as to whether further Initial Filter Criteria triggering is required or not; and wherein said indication is provided:
at third-party registration of the calling and or called party at the MMTel AS, from the S-CSCF or S-CSCFs serving the called and calling parties, or from a Home Subscriber Server; orwithin the request received from the S-CSCF serving the calling party.