Chapter 16 Troubleshooting
V300 User’s Guide
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2 Make sure that your V300 uses the voice codecs recommended by your VoIP service
provider (see Section 6.3 on page 55).
V I can make some VoIP calls, but not others.
The V300’s DNS (Domain Name Service) settings may be misconfigured. See the suggestions
about DNS in the troubleshooting section for “I cannot make VoIP calls.”.
If this does not help, the phone of the person you are calling may be malfunctioning or
misconfigured.
V I can make phonecalls, but I cannot receive them.
or
I can receive some phonecalls, but not others.
Check your V300’s call forwarding settings in the VoIP > Phone Book > Call Forward screeb
(see Section 12.1 on page 97). If they are misconfigured, certain calls may be mistakenly
forwarded.
V All my VoIP calls are of poor audio quality.
• If your ISP or network administrator gave you SIP TOS or RTP TOS values to use, enter
them in the web configurator’s VoIP > SIP > QoS screen (see Section 10.3 on page 91).
• If your V300 is connected to a router with configurable bandwidth management settings,
check these settings. Consult the router’s documentation for more information.
• Make sure that your V300 uses the voice codecs recommended by your VoIP service
provider (see Section 6.3 on page 55).
V I cannot use some calling features.
Many of the features your V300 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.
or
I cannot hear the V300’s ring when a call is incoming.
