You can use any Ooma Office device to make internal calls between extensions.
The way that you will make an internal call depends on the type of phone you are using.
You can call another extension by dialing the extension number. Calling a remote extension places a call to the external forwarding number.
Cisco or Yealink IP phone
Pick up the handset or press the speaker key and dial the internal extension number.
If your IP phone supports Programmable Buttons, you may also press the speed dial or Extension Monitoring button that corresponds to the extension you wish to dial.
Ooma DP1 desk phone
Pick up the handset and use the keypad to enter the extension you wish to dial. The phone will dial automatically.
If you use the keypad to enter the number you wish to dial without picking up the handset, the phone will place the call over speakerphone.
If you are using a headset, either lift the handset off the cradle or push the HEADSET button to get a dial tone, then dial any valid extension.
Click the keypad icon () and dial the internal extension number.
Click the Settings button () and choose Keypad (). Dial the internal extension number.