| 摘要 |
In those instances wherein inter-exchange handoff of a cellular call occurs, and a mobile station desires to activate an in-call service change with respect to that cellular call among and between a plurality of supported voice and data services, a change of service request message is initiated by a serving mobile switching center and transmitted to an anchor mobile switching center. The request is processed by each switching node to confirm availability of the necessary facilities to support the requested service (on either the existing call circuit or a new call circuit). Once confirmed, the anchor mobile switching center initiates a change of service request reply for transmission back to the serving mobile switching center. These messages could be relayed through one or more intermediate tandem mobile switching centers if necessary. Reconfiguration of the facilities is also performed to support the requested service change. |
