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P-2024 Support Notes
I am unable to register to a SIP server
If you are unable to register to a SIP server, do the following.
1. Make sure the Internet connection is up and that you are able to ping the SIP register server from the LAN
behind the P-2024. If your register server uses a domain name, make sure DNS name can be resolved. If you
are using a static WAN IP address, make sure the DNS server is configured correctly on your P-2024.
2. Make sure the SIP account is correct and the password is entered correctly. They may be case-sensitive.
3. Check if there is a NAT ATA install before the P-2024 which is a VoIP station gateway. It is NOT
recommended that you install a NAT ATA in front of the P-2024 as this may cause unexpected problems. If
you still want to install a NAT ATA, use a VoIP ATA (VoIP Analog Telephone Adapter), such as the P-2024
ATA series, instead.
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 P-2024, it is very likely there a
NAT ATA or a firewall blocks the traffic.
It is NOT recommended that you install a NAT ATA in front of the P-2024 as this may cause unexpected
problems. If you still want to install a NAT ATA, use a VoIP ATA (VoIP Analog Telephone Adapter), such as
the P-2024 ATA series, instead.
I can make or receive a call but the voice traffic only goes one way, not both way
If you can register to a 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, there is very likely a
NAT/firewall ATA installed before the P-2024. 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. To 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.
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All contents copyright (c) 2006 ZyXEL Communications Corporation.
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