Call Does Not Connect; Using Sip Addresses Versus Ip Addresses; Domain Name; Call Is Connected But There Is No Audio - Nortel IP Phone 2007 User Manual

Standard

Call does not connect

Before you report a network problem, ensure that you are using the correct SIP
address to call someone.

Using SIP addresses versus IP addresses

Rather than dialing an IP address (for example, ron@12.134.47.78), remember to
use the SIP address (for example, ron3@acme.com). The proxy server that routes
the call may serve several domains, and may not know the domain where a user IP
address resides.

Domain name

You must enter the domain (for example, @acme.com) if the person you are
calling is not in your domain.

Call is connected but there is no audio

If you are using the handset, check that the headset button is not activated. The red
LED beside the headset button indicates when the headset option is active. When
the headset option is active, and even if there is no headset plugged in, you cannot
receive or transmit audio through the handset.

Audio settings

Using your IP Phone 2007, you can change speech codec settings while on a call
to improve audio quality. The term codec is an acronym that stands for
"Compression/Decompression".
Note: The domain name in a user address must not be an Internet
domain.
IP Phone 2007 User Guide
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