ZyXEL V630 User Guide - Page 145
The incoming or outgoing audio is too quiet or too loud., My calls are of poor audio quality.
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Chapter 17 Troubleshooting 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 Section 6.40 on page 93. I can make phone calls, but I cannot receive them. Check your V630's call forwarding settings (see Section 5.19 on page 60). If they are misconfigured, certain calls may be mistakenly forwarded. 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 Section 6.41 on page 93 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. 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. The incoming or outgoing audio is too quiet or too loud. During a call, press the Up or Down key to adjust the volume. V630 User's Guide 145