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14 Aastra MBU 400 User Guide
Introduction
Introduction
The MBU 400 consists of a Mobility Base Unit (MBU) and the Aastra Digital
Enhanced Cordless Telephone handset (420d) that provide telephony service over the
Internet and over the Public Service Telephone Network (PSTN or landlines). You
can install the MBU on a desktop or on a wall, while the 420d handset sits in its
charging cradle on a desktop. You can register up to 8 handsets with the MBU. The
MBU supports up to 3 SIP calls and 1 PSTN call simultaneously.
You can setup the MBU 400 in your business or home environment to act as a small
hub with group calling, voicemail, individual SIP accounts, or SIP lines shared across
a group. Once installed, the handsets can handle all calls for every line (IP calls and
PSTN calls). Your System Administrator can configure your phone via transfer of a
configuration file over TFTP or HTTP, a local web interface, or the handset user
interface.
The MBU can be connected to the Internet (service provider required) via an Ethernet
cable connected to the LAN port, and/or the PSTN via a regular telephone cable
connected to the LINE (or landline) port. The LINE connection also allows for
emergency calling and provides the handling of call overflow on the MBU.
Features
MBU Features
Call and Telephony Features
• VoIP calling (based on SIP 2.0 - RFC3261)
• (optional) Landline calling over Public Service Telephone Network (PSTN)
• Up to 8 paired handsets, one line per handset (MBU supports up to 3 SIP calls and
1 PSTN call simultaneously)
• VoIP DTMF digit support (inband, SIP Info, RFC2833)
• Voicemail support (indicators for receiving and handling of voicemail, and call-to-
voicemail server)