I'm having some issue with getting VOIP to work correctly behind the ASG.
- I have SIP helper turned on and configured with the IP range of the provider's severs in the SIP Server Networks section. I have my Internal Network in the SIP Client Networks and expectation set to Strict.
- A firewall rule for any of the internal phones headed outbound to those servers allowing Any service.
The phone registers with the provider. Date and time update and voicemail notifications will pop. No issue. But if I make a call into the phone there is a dropped packet from the SIP server range to my External IP on port 5060. The phone doesn't ring.
If I add a DNAT rule and point incoming connections on VOIP protocols from the SIP Server range to my External Adapter address and push them to the phone directly everything seems to work.
OK, that's all good, but what if I have 2-3 phones? How can I handle this?
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