The method of studying the completion time of address binding inside the address translation device for the SIP signaling server

摘要

Public address temporarily through the NAT address translation device which binding is done in private address of the client, being the signaling server who has the expedient in order to transmit SIP signaling message with the client, it must receive the register message which comes from the client and term of validity (it must transmit the register message where the client is new in the end to the signaling server,) expedient in order to transmit to that is included. With this invention, until end of binding is detected to the case where the client is located on back of the NAT address translation device, approximately completion time of temporary binding is decided by continually transmitting test message after the waiting which increment is done. This approximately time it is used by as SIP term of validity being transmitted.