FIELD: information technologies.
SUBSTANCE: terminal, method and system are proposed to perform a service with channels switching - CS-service, a service on the basis of session initiation protocol SIP or combined CSI-service. According to realisation of invention, the terminal connects controller in order to receive version of functional capabilities of terminal, at least of one target terminal, in order to compare this received version of functional capabilities of terminal with previously memory-stored version of functional capabilities of terminal of this at least one target terminal, and in order to determine on the basis of comparison result whether it is required to request data on functional capabilities of terminal at least of this target terminal. At the same time specified version of functional capabilities of terminal identifies version of functional capabilities of this at least one target terminal.
EFFECT: improved efficiency and simplified procedure of alarm on establishment of connection for service realisation.
29 cl, 8 dwg
