FIELD: communication systems.
SUBSTANCE: invention relates to the field of communication systems based on the SIP trunk. A method is proposed for providing a SIP trunk service to at least one telephone system [102] by an application server [101] over a wireless network, including establishing a connection between at least one telephone system [102] and a first network entity [104A] via the first access node [103A]; and providing at least one SIP trunk service. Then at least one telephone system [102] dynamically checks the connection with the first network entity [104A]. At least one telephony system [102] establishes a connection with the second network entity [104B] via the second access node [103B] if the connection with the first network entity [104A] fails, and sends a signal request to the application server [101]. The application server [101] processes the signaling request and provides at least one SIP trunk service to at least one telephony system [102].
EFFECT: providing an efficient solution for providing SIP trunk services to at least one telephony system by an application server over a fixed network.
13 cl, 7 dwg
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