This makes more sense than pfblocker being the issue. Another option would be to assign your phone(s) a static lease through DHCP and then create a rule which allows any traffic from that IP out from any port. I don't have Vonage, but in the office we have a different VOIP service and that's what I ended up doing. I followed all the documentation and opened all the ports they said were required and still had issues on some phones, so I got tired of that game. I added all phones to an alias and with one rule solved all those issues.
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