Hi List,

 

Please consider the following:

 

*       SIP client send the REGISTER message to Registrar server from
multiple locations. Q-value is not send by SIP client in its REGISTER
request. 

 

*       Registrar server sends the 200 OK to the SIP client with all the
binding for this user along with expiry timer for each binding.

 

*       SIP client selects its own binding to get expiry timer allocated by
Registrar server.

 

*       But if all the SIP clients are located behind the NAT (in different
LAN networks) and same IP address is assigned to each SIP client suppose
192.168.1.1, all SIP client will send the IP:Port viz 192.168.1.1:5060.

 

*       Now when 200 OK is send by Registrar server to SIP client, all the
bindings in 200 OK includes the same IP address. Now, what should be the
implementation in SIP client to select its own binding since all the
bindings shall have same IP:Port. 

 

 

Best Regards,

Vivek Batra

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