| 摘要 |
A method, an apparatus, and a computer program product for wireless communication are provided in which a mobile station determines characteristics defining packet switched services available on a network. The mobile station may determine preferences, policies and permissions of a network operator, relating to selection of services used to make a voice, video or other call. The mobile station registers with an IP multimedia subsystem server, and the mobile station may then announce its presence using a presence server of its home network. The mobile station may establish calls through an address book that identifies other mobile stations that have announced presence on the presence server or on another presence server in communication with the home network presence server. When no presence server is available, mobile stations may exchange information using session initiation protocol (SIP) options to determine mutual capabilities and to initiate connections. |
