Cortelco 2757 - Manual (Page 27)

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2.7 Accepting and Making Phone Calls
After completing the network and SIP settings, you can use the 2757 to make and accept phone
calls.
2.7.1 Accepting phone calls
Before you can receive phone calls, your phone must be registered to a SIP server. You will see
the message below on the LCD screen when the phone is registered.
If the phone is not registered to a SIP server, you will see ‘Initializing SIP …’ displayed on LCD
screen. If you see this message, please check your network cables and settings again.