I Can Register To The Sip Server But Cannot Establish A Call; I Have Tried All The Troubleshooting Steps, But Still Cannot Register To The Sip Server. What Should I Do Next; What Should I Do If There May Be A Hardware Problem With My Prestige - ZyXEL Communications P-2608HWL-D1 Support Notes

P-2608HWL Series Support Notes

I can register to the SIP server but cannot establish a call?

If you are able to register to the SIP server but cannot make a call through the Prestige, it is very likely there a
NAT router or a firewall blocks the traffic.
It is strongly NOT recommended that you install a NAT router in front of the Prestige as this may cause
unexpected problems. If you still want to install a NAT router, use a VoIP ATA (VoIP Analog Telephone
Adapter), such as the Prestige ATA series, instead.
If you have a firewall in front of the Prestige, make sure that you have configured to firewall to allow SIP
pass-through. Make sure the range of RTP ports are also allowed on the firewall.
I can receive a call but the voice traffic only goes one way, not both way?
If you can register to server and can only make an out- going call but cannot receive incoming calls or the
incoming call signal establishment can be made but the voice traffic only goes one way, this happens when
there is very likely a NAT/firewall router installed before the Prestige. Refer to the NAT/firewall related
questions for more information.
I have tried all the troubleshooting steps, but still cannot register to the SIP server. What
should I do next?
In this case, contact your local service provider for support. If they cannot solve your problem, they will send
your problem to the ZyXEL global technical support center. help out the problem they will escalate your
problem to ZyXEL tech center.
To help us solve your problem quickly, please prepared the following information.
1. Serial number of the device.
2. SIP Call server type and service provider.
3. Your device firmware version and romfile (or the configuration file) with the administrator login password.
4. Detail information of what you have tried to resolve the problem.

What should I do if there may be a hardware problem with my Prestige?

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