LEARNING EXPIRY TIME OF AN ASSOCIATION OF ADDRESSES IN AN ADDRESS TRANSLATION DEVICE FOR SIP SIGNALING SERVER

摘要

The invention concerns a signaling server (SS) comprising means for transmitting SIP signaling messages with a client (T) via an address translation device (NAT) temporarily associating a public address with the client's private address, comprising means for receiving the client's recorded messages, and for addressing to the client a duration of validity at the end of which it must transmit a new recorded message. The invention is characterized in that if the client is located behind an address translating device, it determines an approximate expiry time of the temporary association by successively sending messages until the termination of the association is detected. Said approximate expiry time is then used by being transmitted as SIP duration validity.