I have 2 voip routers where OpenDNS server 126.96.36.199 is not resolving the SIP provider's outbound proxy server hostname with either of the 2 correct IP addresses. This is causing all IP phones to try and register with the incorrect outbound proxy IP. I have implemented a work around to bypass dns lookups for now.
The issue is that OpenDNS server 188.8.131.52 is resolving g1-ne01.nms.outboundproxy.com to 184.108.40.206. 220.127.116.11 resolves to hit-adult.opendns.com which is of course not a valid SIP server for the phones to register to. I have the issue using both Verizon Enterprise and Lightpath internet circuits on one router and then just FIOS on another.
Below nslookup shows the issue. Same lookup on other routers does not have the issue. https://cachecheck.opendns.com/ shows the correct IP for this hostname which 18.104.22.168. I do not subscribe to any OpenDNS service and just use 22.214.171.124 as my router secondary DNS server, for the WAN, and all LAN devices. Are my affected router's WAN IP on some sort of black list with OpenDNS?
# nslookup g1-ne01.nms.outboundproxy.com 126.96.36.199
# nslookup 188.8.131.52
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