ZyXEL Communications P-2802H-I Series, User Manual

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Chapter 25 Troubleshooting
P-2802H(W)(L)-I Series User’s Guide
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• Check the settings for QoS. If it is disabled, you might consider activating it. If it is
enabled, you might consider raising or lowering the priority for some applications.
25.4 Phone Calls and VoIP
V
The telephone port won’t work or the telephone lacks a dial tone.
Check the telephone connections and telephone wire.
Make sure you have the
VoIP SIP Settings screen properly configured.
V
I can access the Internet, but cannot make VoIP calls.
Make sure you have the VoIP SIP Settings screen properly configured.
One of the PHONE lights should come on. Make sure that your telephone is connected to the
corresponding PHONE port.
You can also check the VoIP status in the Status screen.
If the VoIP settings are correct, use speed dial to make peer-to-peer calls. If you can make a
call using speed dial, there may be something wrong with the SIP server, contact your VoIP
service provider.
V
I cannot call from one of the ZyXEL Device’s phone ports to the other phone
port.
You cannot call the SIP number of the SIP account that you are using to make a call. The
ZyXEL Device generates a busy tone and does not attempt to establish a call if the SIP number
you dial matches the outgoing SIP number of the phone port you are using.
For example, if you set
Phone 1 to use SIP account 1 and set Phone 2 to use SIP account 2,
then you can use Phone 1 to call to SIP account 2's SIP number or Phone 2 to call to SIP
account 1's SIP number.