FIELD: radio engineering, communication.
SUBSTANCE: communication system comprises a terminal device for machine-type communication, a service provisioning server that sends a trigger message, and an interworking function support unit for machine-type communication that checks, whether the server is authorized to send a trigger message. The communication node blocks the trigger message if this test fails.
EFFECT: according to the invention, unnecessary network traffic can be reduced and also the battery consumption of the communication device can be reduced by preventing the sending of untrusted trigger messages.
20 cl, 12 dwg
