I tried a lot of things, playing with SIP helper and 1:1 mapping but never get it work.
I have many SIP phones behind NAT (Mikrotik 750 network: 192.168.1.x), they register to an external sip proxy named “proxy1” (IP: x.x.x.1) and can make/receive calls without any problems.
So when a phone (192.168.1.100) send a request, a new tracking connection is created in NAT table (192.168.1.100:5060 to x.x.x.1:5060), so proxy1 can replied to local phone as long as the entrie continues to exist in NAT table of the Mikrotik.
Problem: I have a backup SIP proxy named “proxy2” (IP: x.x.x.2) that shares the same DB and can send request too. When proxy2 send a request to the phone, I see the packet arrived in the MT, but there is no tracking connection in the NAT table, so packet can’t be NAT to the local phone…
Does SIP helper support routing incoming calls ? Any idea how I could achieve this ?
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