VERFAHREN ZUR ERSTELLUNG EINER IMS-SITZUNG

The invention concerns a method of establishing an IMS-session comprising at least one media-stream (1001) with a terminal (21) associated with a user (1) through an IP-packet based communication network (100), wherein the terminal (21) is IP-capable, but SIP-incapable. At an network node (200) of the IP-packet based communication network (100) a SIP-signaling client instance associated with the user (1) is initiated. The SIP-signaling client instance represents the SIP-incapable terminal (21) and terminates the SIP-signaling in place of the SIP-incapable terminal (21). For establishing the IMS-session with the SIP-incapable terminal (21) SIP-signaling messages with the SIP-signaling client instance of the network node (200) are exchanged wherein the SIP-signaling client instance inserts a network address of the SIP-incapable terminal (21) as receiving address of at least one media-stream (1001) of the IMS-session in at least one of the exchanged SIP-signaling messages.