CPC H04L 65/1016 (2013.01) [H04L 65/1073 (2013.01); H04W 8/04 (2013.01)] | 13 Claims |
1. A method for implementing a call service, comprising:
deciding whether a first state of a terminal in a Mobile Switch Center enhanced for ICS (eMSC) is consistent with a second state of the terminal in an Internet Protocol Multimedia Subsystem (IMS); and
in response to an inconsistency between the first state and the second state, sending a registration request to the IMS to cause the terminal to complete an initial call service,
wherein the eMSC does not subscribe to registration state information in the IMS.
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