FIELD: information technologies.
SUBSTANCE: method includes detection of whether information on media parametres supported by calling party is received in message of call initialisation, and if information on media parametres supported by calling party is not received, transfer of special message to receiving party on the basis of function of service change and transfer to reserve mode, receipt of information on media parametres supported by receiving party in response to this message, processing of information on media parametres supported by receiving party, and completion of procedure of call establishment in compliance with media parameters supported by calling party and receiving party.
EFFECT: elimination of high cost of connection for receiving party, if calling party in roaming mode.
37 cl, 6 dwg
