FIELD: information technology.
SUBSTANCE: if necessary, when switching from a packet switching domain to a channel switching domain, a mobile station receives a relay transmission number, initiates a session request in the channel switching domain, receiving a relay transmission number in form of a call number, and sends a session request in the channel switching domain to the access network of the packet switching domain, which routes the session request in the channel switching domain to the control object of channel switching domain calls. The internetworking communications server, in accordance with the relay transmission number, establishes a connection for session request of the channel switching domain with the initial mobile station session an notifies the mobile station on the need to carry out relay transmission of a radio interface from the packet switching domain to the channel switching domain and the mobile station notifies the internetworking communications server on the need to complete relay transmission from the packet switching domain to the channel switching domain.
EFFECT: simplification of the routing process and reduced cost.
18 cl, 12 dwg
