Making and Answering Calls
Making and Answering Calls
The MBU 400 System allows you to make both Internet and landline calls. Landline calls are calls made over the Public Service Telephone Network (PSTN) just like a regular phone. All outgoing calls (except emergency calls) are Internet calls by default, unless you specify otherwise. All emergency calls default to the landline. (If you don’t have a landline connected, you must change the emergency line setting. See Changing Emergency Line Settings on page 41 for details.)
The following sections describe how to make and answer Internet, landline, and intercom calls with the MBU 400 System.
VoIP Calls
To make internet calls on your Aastra MBU 400 phone, you must have registered an account on the MBU system through either the handset, Web UI, or configuration file. This may have been done for you by your System Administrator. If there are no VoIP accounts in the system, you will not be able to make internet calls, and attempts to do
so will result in a red IP icon 
on the handset display. For more information see Configuring the Phone Using the Handset on page 23, the Aastra MBU 400 Administrator Guide, or contact your system administrator.
When you make and receive Internet phone calls, the following icons display:
Entering or editing a number
Dialing or ringing
Active Call
Incoming Call
Making a VoIP Call (over the Internet)
If your primary line is set as VoIP, do the following to make a VoIP call:
1.In Idle mode, enter the number you want to dial.
2.Press the green key R .
If your primary line is set as Landline and you want to make a VoIP call, do the following:
1.In Idle mode, enter the number you want to dial.
2.Press the Options softkey.
3.Select Call on VoIP, and press OK z.
The phone dials the number as a VoIP call and displays the IP dialing icon.
42 | Aastra MBU 400 User Guide |