Call Features

Note: If you have opened the application in multiple tabs in your browser, the call features will be supported only in the first tab you opened. In all other tabs in which you have opened the application, an error message Phone is not available because Mitel One is opened in another tab or window on this device will be displayed and the call features will be disabled.


During an active call, the Mitel One web application call screen provides access to the following call control features:
  • Mute — Prevents the other party from hearing your voice and any background noise.
  • Keypad — Enter the phone number of a contact using the keypad to call the contact. Also, you can use DTMF tones on IVR to call the number.
  • Video — Clicking this option launches a meeting session with only screen sharing capability. The audio call will continue through the Mitel One web application. A messaging session will be created with the contact at the other end of the call and a Join now message is displayed in the message. The contact must click Join now to join the meeting.
  • Hold — Place the caller on hold.  To place a call on hold, click the Hold icon (). This also disables all the other icons and a On Hold banner is displayed on your call screen. While you place a call on hold, the contact at the other end is alerted with a beep unless hold music has been setup for your Mitel account. To retrieve the held call, click the Hold icon () again.
  • Add call — Add a new call to the ongoing call.
  • Transfer — Transfer an active call to one of your contacts or another phone number. For more information, see Transfer a Call.
  • End call — Click the icon to end the call.
  • — This icon appears in the call screen of users encountering issues with the network or an outage during the call. The audio communication might be affected while this icon is displayed. This icon will disappear when the connection is properly re-established.
Note: You can set DND (Do Not Disturb) at any time to block calls to your Mitel One web application. For instructions, see Set Your Presence and Status Message.