Chapter 28 Troubleshooting
•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.
28.4Phone Calls and VoIP
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.
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
I cannot call from one of the ZyXEL Device’s phone ports to the other phone port.
If you are using extension numbers to call from one phone to another, ensure that the VoIP > Phone > Ext. Table screen is correctly configured.
On a phone connected to one of the ZyXEL Device’s PHONE ports, try pressing the pound key four times (####). This calls the phones connected to the other PHONE port.
If you are using a SIP account to call the other phone(s), make sure that both phone ports do not use the same SIP account. 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.
If you use different SIP accounts for each phone port, you can call from one to the other. 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.
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