| http://www.w3.org/ns/prov#value | - Also still, the predetermined protocol may be the session initiation protocol (SIP) and the MT may be operative according to a procedure for registering with an Internet Protocol (IP) Multimedia Subsystem (IMS) server so as to allow the MT to access, over a digital communication system, an IP multimedia service to which the MT is subscribed, the procedure including having the MT send an SIP regist
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