Hi Everyone. I have a confusing issue with a new router and wondered if someone may be able to help?
our UCM6202 has worked great for years, behind the ISP supplied technicolor router. from what i understand the old router forwarded port 5060 to the UCM and then a selection of media ports to my internal SIP phones.
That technicolor router has started to fail so i have replaced it with a draytek vigor 2762. Simples. hmmm. but the phones will not receive inbound calls, and outbound calls do not get inbound audio.
Swap back to the technicolour and it works fine (until it overheats again.) If I put the draytek in place and immediately the calls stop.
I have setup the same port mappings on the new router as were present on the old router. I’ve disabled SIP_ALG and otherwise mimicked settings between the routers but i cannot get it to work. even tried turning on uPnP and a DMZ to the UCM.
SIP trunks are from draytel. IP phones are cisco 2760g there are 4 internal phones all in the same IP network as the UCM.
Any ideas? I would be happy to pay someone to get this working but where should i look for an engineer?
Thanks in advance, Al