FIELD: information technologies.
SUBSTANCE: invention relates to the communication systems. One proposed system and method of system messages exchange through the protocol SIP introducing in existing structure of SIP of new information content in view of MIME and new descriptor of indicator for particular service information and receiving user reply. System messages can contain list of probable choose variants and require existence of users reply.
EFFECT: improving of user serviseability.
12 cl, 5 dwg, 10 tbl
