ZyXEL Communications Corporation V630 Manual De Usuario

 Chapter 17 Troubleshooting

V630 User’s Guide

The SIP server’s expiration time is how long an entry remains registered with the SIP server. 
After the time period expires, the SIP register server deletes the V630’s entry from the 
database of registered SIP numbers. Different register servers may use different time periods. 
You may need to configure a shorter time in the Expire menu. See 

. 

V

I can make phone calls, but I cannot receive them.

Check your V630’s call forwarding settings (see 

). If they are 

misconfigured, certain calls may be mistakenly forwarded.

V

My calls are of poor audio quality.

1 The Wireless LAN signal may be weak. Move closer to the access point, and away from 

potential sources of radio interference (such as microwave ovens, electric motors and 
other radio frequency emitting devices). If you have more than one access point, scan for 
and connect to the one with the stronger signal.

2 If your V630 is connected to a router with configurable bandwidth management settings, 

check these settings. Consult the router’s documentation for more information.

3 Your V630 may be set to use a voice codec (audio coder / decoder) that does not provide 

optimal sound quality. See 

 and check with your VoIP service 

provider to find out the codecs you should use.

4 Your VoIP service provider may be using settings that reduce voice quality in order to 

conserve bandwidth. You may need to subscribe to a different calling plan to get better 
call quality.

5 The VoIP service’s channels may all be full. Wait a short time and try again.
6 If call quality is always poor when you call certain phone numbers, the other person’s 

connection may be at fault.

V

I cannot use some calling features.

Some features your V630 supports depend on your VoIP service provider. You may have to 
subscribe to certain services. Contact your VoIP service provider for more information.

V

The incoming or outgoing audio is too quiet or too loud.

During a call, press the Up or Down key to adjust the volume.