multiple obi200 on same LAN

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Gary2000:
I have 2 obi200 devices at home on the same LAN. 1 freephoneline number on each obi200. Everything works except the two phones can not talk to each other. The phone rings but cannot hear each other. If I call the obi number of the other phone, there is no problem.

Mango:
Perhaps forwarding your RTP ports would solve the problem.

1) Use your router to assign a static IP to each ATA.

2) Navigate to Service Providers >> ITSP Profile X >> RTP.  Set each ATA to use a different LocalPortMin and LocalPortMax range, for example, 20000-20010 for the first OBi and 20011-20020 for the second.

3) Use your router to forward the UDP ports 20000-20010 to the first OBi's IP address, and 20011-20020 to the second OBi's IP address.

4) Test to see if the problem is solved.

Alternate solutions: use the OBi's dial plan to route calls to the other ATA's phone number via OBiTALK.  Or, try to use voip3.freephoneline.ca - if that works, file a ticket with FPL and advise that you have no audio unless you use voip3.

Gary2000:
Thank you so much.
The port forwarding solution does work.
Is there any security concerns of port forwarding?

Mango:
I'm unaware of a way to attack an OBi ATA via its RTP ports; doesn't mean it's not possible or will not one day become possible though.

If you are particularly security-conscious, with some routers, you can restrict port forwarding to traffic from a specific IP.  I know this works with Tomato; haven't tested it with other routers.

Example:
OBi A LocalPortMin 20000 LocalPortMax 20010 IP 192.168.1.10
OBi B LocalPortMin 20011 LocalPortMax 20020 IP 192.168.1.20

Forwarding rules:
From 192.168.1.20 20000-20010 UDP To 192.168.1.10
From 192.168.1.10 20011-20020 UDP To 192.168.1.20

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