On your Cloudcalling handset, press *21 to pick up a call ringing on a different phone.

*21

 Pick up First Call Ringing If your phone terminal extension has the User is multi-user aware enabled, you can pick up any call ringing the extensions that belong to the same organization account as you. Dial *21 on your phone keypad and you will be able to pick up the first call in the list of calls ringing the organization account.
*21TARGET_NUMBER Pick up Call Ringing If there are several calls ringing your organization account and you want to pick up the call on a specific extension, you must dial *21 followed by the number of the target extension. Suppose two calls are ringing on extensions 001*004 and 001*005 at the same time, to pick up the call on 001*004, you must dial *21004.
*21PARTIAL_NUMBER Pick up First Matching Call To pick up the call ringing on a certain extension, you do not have to specify the entire number of the target extension. If you dial *21 followed by the first few digits of the number (PARTIAL_NUMBER), VoipNow will pick up the call on the first extension with the number matching PARTIAL_NUMBER. Suppose two calls are ringing extensions 001*211 and 001*222 at the same time, to pick up the call on 001*222, you can dial *2122 (instead of *21222).
*66 Dial Last Missed Call A Phone Terminal extension can contact the last missed call by dialing *66.
*85/*65 Activate/Deactivate Anonymous for Outgoing Calls A Phone Terminal extension can activate the Anonymous feature for outgoing calls by dialing *85. To deactivate it and stop placing calls as Anonymous, you need to dial *65.
in VOIP – Cloud Calling