Voip over VPN?

By andre.guerrette ·
Hi everyone,

I currently have 2 netgears FVS318v3 which are connected and I am able to ping both LAN's from both locations and access the domain, so I figure my VPN is good and running, and it has been so for more than several days now without any problems.

My issue is that we have a voip PBX at the head office, and a hard voip phone at the remote office and I can't seem to be able to make a connection between the two. I've called the company that has sold us the system and he says that he is not able to ping the remote site when he's logged onto the PBX. I tried to ping the pbx from the remote site and everything is going through fine.
Is there something that I'm missing, any special rules that I should be adding to the routers? Any ideas or tips would be greatly appreciated, it's been a while and now I'm running out of ideas.


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Some ideas

by Fregeus In reply to Voip over VPN?

Hey Andre

Most of the time, when you cannot ping another site, is that your gateway doesn't know how to get there. Have you asked the PBX guy about his network configuration?

When you and the PBX guy were doing your tests, were you using names or IP addresses? Names require a DNS configuration, check that out.

Can the PBX guy do a traceroute from his device to the destination to see where its blocking?

In the VPN configuration, is the device configured to allow the necessary protocols through? ICMP (ping) may go through, but VoIP may not.

Have you tried sniffing at different points to see if connections are not sending messages that you may not get otherwise?

I hope this helps a little

Good luck with your installation


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Is RIP enabled in the Netgear?

by robo_dev In reply to Voip over VPN?

Either you need to add a static route to the:

a) PBX
b) PBX-end Netgear router
c) site router at pbx site

Or ensure that the appropriate version of RIP is enabled on the PBX-end Netgear router so that the main router can get RIP advertisements of the route to the remote site (also called Network Auto Discovery or NAD if this were a Cisco device).

The bottom line is there is no route. You can define it manually with a static route, or automatially with RIP.

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