[sipx-users] sipx redundancy firewall/NAT issue

["Soo Wei Kang" <soowk@xxxxxxxxxx>]

Hi,

 

I’m using latest sipx build 3.10.2-013143 and I’ve installed it in 2 machines for redundancy, namely sip1 and sip2. So, some SIP client will login to “sip1” and some will login to “sip2” based on DNS SRV query.

 

For example, we have a client with username “alice@xxxxxxxxxxx” registering to sip1 and another client with username “bob@xxxxxxxxxxx” to sip2. The Domain is “example.com”. When alice make a call to bob, an INVITE message is sent from alice to sip1. Then, sip1 will send an INVITE message directly to bob instead of sip2 (note that bob is registered to sip2). This may not be an issue if the client and server are on the same network. But, in a firewall/NAT environment, this could pose some problem because bob is connected to sip2 and not sip1. Any message from sip1 to bob will be rejected.

 

Is there a way to configure sipx such that if sip1 knows that bob is registered to sip2, it should forward the INVITE to sip2 first and let sip2 send the INVITE to bob?

 

Thanks.

 

Regards,

WK