Cortelco 2757 - Manual (Page 32)

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2.7.2.3 Line 2
Pressing this key places the distant party on hold and provides a new dial tone. A new call can
then be placed. You can toggle between these calls with the ‘Switch’ button. A second SIP
registration is not required for this function. The 2757 can support up to two simultaneous calls
(one active and one on hold).
2.7.2.4 Hold
Pressing this key will place your remote party on hold so that they cannot hear anything. To
resume the call, press ‘Back’.
2.7.3 Making phone calls
If you have registered multiple SIP phone numbers, select one by pressing the a line key.
Lift the handset, and dial the phone number. Normally, the phone will wait 5 seconds before
transmitting the digits. If you wish to dial immediately, press the ‘#’ key after dialing.
If you dialed the wrong number, or the remote party is not available, you will see the message
shown below.
After the call is ended, hang up the phone or press the Speaker button.