Extension to Extension dialing not working with virtual PBX and Pfsense
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Everyone,
I am running Pfsense 2.4.2. I have a 3CX hosted PBX that I am trying to use. The trouble I am having is that, while external calling works both inbound and outbound, internal calls go through, but there is no audio on either end. As this is a hosted PBX, I know that the RTP traffic is having to hit the firewall. I just don't know what Pfsense is doing with it when there are two internal SIP devices trying to talk to "each other." I have disabled source port rewriting for outbound UDP traffic, but that did not work. Any ideas?
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What guidance does 3CX give regarding what NAT is required in your situation?
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In this case, we've simply implemented a 3CX Session Border Controller to get around these issues. I was only hoping to not have to do that as I know that this is not a problem with some other routers.
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It is not a problem with pfSense either but you need to know what NAT has to happen.
It usually involves some combination static ports on outbound NAT and port forwarding inbound.
