Using a Handset:

Pick up the Handset.
Dial the number.
Press the Send soft key.

Use the Speakerphone:

With the Handset on-hook.
Press the Speaker key.
Dial the number.
Press the Send soft key.

Use a Headset:

With the Headset connected.
Press the Headset key to activate the headset mode.
Dial the number.
Press the Send soft key.

Note: Calls to the US and Canada are all dialed using 10 or 11 digits. Your system may be programmed to require a 9 or 8 prior to dialing the telephone number.