ZyXEL Communications P-2000W V2 - Manual (Page 11)

P2000W V2 Troubleshooting Guide
All contents copyright (c) 2005 ZyXEL Communications Corporation.
5. I can register but can not establish a call?
If you can register to server but can not make a call very likely there is NAT
router before it, please see NAT related question above for tips to
troubleshoot.
6. I can make a call but the voice only goes one way not
bothway?
If you can register to server but can make a call signal establishment but the
voice only goes one way very likely there are NAT router before it, please see
NAT related question above to tips to troubleshoot.
7. I can receive a call but the voice only goes one way not
bothway?
If you can register to server but can only make out going call but can not
receive incoming calls or the incoming call signal establishment can be made
but voice only goes one way very likely there is NAT router before it, please
see NAT related question above for tips to troubleshoot.
8. If all the about have been tried, but register still fail or call
still have problem to be made behind the NAT what should I
do?
In such case, please contact your local vendor for support. If they can't help
out the problem they will escalate your problem to ZyXEL tech center. To
report a problem please prepared below info.
1. Serial number of the device.
2. SIP Call server type and vendor.
3. Your device firmware version and romfile with password.
4. Detail information what you have tried to resolve the problem.