• When pressed, it will call the intercom extension which will beep an auto-answer with speaker phone and mute. This is what's provided the one way audio.
• The recipient can setup a two way call by pressing the mute button to unmute the call.
• Cannot be used on a shared line

• Program an extension as intercom that automatically call another extension
• Remember you need a pair of DN
• intercom <number> where <number> is the number to call when the intercom button is pressed.

ephone-dn 51
  number B5000
  intercom B4999 label <display-name>
ephone-dn 52
  number B4999
  intercom B5000 label <display-name>

• Assign intercom to ephone
• Default will auto answer in mute

ephone 6
  button 2:51
ephone 7
  button 2:52

• Configure auto answer on a DN
  • For some reason I cannot use alphanumeric char on the 7971 SIP phone
• Assign a label as intercom

voice register dn 9
  number 2000
  label <intercom>
  auto answer

• Assign DN to recipient/secretary phones

voice register pool 10
  number 2 dn 9

• Assign Speed Dial on manager's phone
• The number can be any intercom number including SIP or SCCP

voice register pool 11
  speed dial 1 2000 label "Secretary"

• We can also assign Speed Dial on manager's phone even if it is a SCCP phone
• The number can be any intercom number including SIP or SCCP

ephone 12
  speed dial 1 2000 label "Secretary"

• Intercom call will answer even if the phone is busy

• Program an extension as intercom that automatically call another extension
• Remember you need a pair of DN
• whisper-intercom <number> where <number> is the number to call when the intercom button is pressed.

ephone-dn 51
  number B5000
  whisper-intercom B4999 label <display-name>
ephone-dn 52
  number B4999
  whisper-intercom B5000 label <display-name>

• Assign intercom to ephone
• Default will auto answer in mute

ephone 6
  button 2:51
ephone 7
  button 2:52

• barge-in - allow inbound call to force existing call to go into call hold state.
• label - to label the intercom line

ephone-dn 1
  intercom <extension> [barge-in [no-mute] | no-auto-answer] [label <label>] [no-mute]