Remote workers no dialtone

[dialtonetek]

Hello everyone
I have a customer with an IPO woth 8.0.42
Using 9620 phones offsite
System is equipped with a combo card for VCMs
Trouble is when they log in. They have dial tone
and make or receive a call. After that no dial tone
and can't talk after answering a ringing call.
I can watch through system status the phone ringing,
the user answering the call and grabbing a VCM.
Outside party can't be heard and outside party can
hear user.

Any ideas?
Thank you in advanced!

 

[amriddle01]

Nearly every iussue with remote workers is incompatible routers system end (doing the port forwarding), usually Draytek and Cisco are the worst offenders, you may lose all your hair trying to fix this

 

[Hovus]

Add FortiGate firewalls to the incompatible list...I've been dealing with the same issue for 3 months now. If you find a solution, please share because I'm at my wit's end.

 

[TomMills]

And virgin media routers in the UK without changing from Router mode to Modem mode.

http://www.twitter.com/tem1985

APSS/ACIS/ACSS-SME
not arrogant, just succinct.