I have Two Office (A and B ) In each Office there is RB-750GL Router , both Office connected with L2TP VPN , in Each Office I have IP PBX connected to each other with SIP protocol.
Everything is working great , but at the end of the day office ( A ) disconnect the power from all the equipment and devices , next day morning they power up all the devices again , VPN is working fine ( file share , RDP …etc. ) except the SIP connection , if I change the PBX IP address in Office A the SIP connection will work again , then I can change it back after an hour.
I think the Router in the Office( B ) block the SIP traffic generated from The PBX because no replay from the target.
I delete all the firewall rules , and disable the NAT helper for SIP ( it have no work in VPN but I did it as try ) but the problem still the same I have to change the PBX IP address every day morning.
Any help Please.
see the attached image please
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Last edited by Hussam
on Sun Jan 26, 2014 7:35 pm, edited 2 times in total.