FIELD: information technologies.
SUBSTANCE: method is provided through method of useful data selection (initial multimedia data 13/B; 14/B'), transferred prior to completion (20) of call connection establishment (1-12; 15-19) between user-initiator of call connection establishment (terminal device A) and at least one user-addressee of call (terminal device B or terminal device B') through at least one telecommunication network (SIP-moderator), in which user-initiator (A) of call connection establishment in response message (9, 10 from B or 11,12 from B') applies data of reception address (IP-B, Port-B of terminal device B or IP-B', Port-B' of terminal device B') of user-addressee of call for at least one user-addressee (B or B') of call, so that by user-addressee (B or B') of call together with data of transfer address (IP-b, Port-b for B; IP-b', Port-b' for B') of user-addressee of call to select sent useful data (intial multimedia data 13 from B/14 from B'), at the same time data of reception address (IP-B, Port-B of B device) of user-addressee of call for addressee (B) of call also provide data of transfer address (IP-b, Port-b) of this user-addressee (B) of call.
EFFECT: improved efficiency of selection of initial multimedia useful data flows selection.
14 cl, 1 dwg
