Von L. wrote:
plugged in. They work immediately after being plugged in, but they lose
the ability shortly thereafter. They can always make outbound calls, but
only to real phone numbers, not extensions.
They each have NAT routers, and I have triple checked that they have
opened/forwarded the correct ports, basically 5060-30000 UDP. Once they
See the "NAT Issues" section at http://www.voip-info.org/wiki/view/IAX.
(The page is for IAX2, but the NAT issues are relevant for UDP SIP ports
too).
Basically, some NAT routers "forget" UDP mappings after a VERY short
time (like 30 seconds). Took me a while to figure that out.
- Mike
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