FIELD: information technologies.
SUBSTANCE: invitation to a session is received in the first server of user access from user initiating the session; besides invitation indicates at least one group of users that belongs to the second server of user access as the possible participant; invitation is sent to the second server of user access, containing identifier of a group of users; in the second server of user access group identifier is decomposed into combination of group member identifiers; response is sent with specification of group member identifiers to the first server of user access; and the first server of user access sends invitation to at least some members of this group, specified in the response.
EFFECT: processing of invitations to multi-user communication session, using IP multimedia subsystem, for organisation and control of session, where user access is controlled by two or more servers of user access.
10 cl, 1 dwg
