This bit me in the *ss this afternoon.

What I couldn't figure was why inbound calls were fine.

Outbound calls could be dialed, but went 'dead air' - no 'ring sound' no nothing.

In doing things to help support narrow down the cause - I dialed from my handset to my own number. XLite showed <my number>@east01.voipwelcome.com as the incoming number - and audio was perfect both directions. That tipped me off that the problem was somewhere else in the network.

Tim - as an aside - you might want to get the support folks to stop using "forward ports 35000-65000" as a first line of defense. When a customer has had a working line for some period of time, and suddenly goes "bad" - it's not likely to be a port forwarding issue....

No offense intended - hope none is taken.