Mitel Superset 401+ Digital Phone Conference Phones 8600 can support both Inter-Tel

8600 can support both Inter-Tel protocol and Session Initiation Protocol (SIP)

3-4 share physical ports

and Voicemail

The Adtran 1200309E1 can be used to help configure a PRI channel bank in an Atlas 550

OPTIONAL: Headset Lifter

Mitel Superset 401+ Digital Phone Conference Phones 8600 can support both Inter-TelMitel Superset 401+ Digital Phone Description: The Mitel Superset 401+ is a single line telephone designed to be affordable and cost effective. The 401+ is a digital phone designed to work on Mitel phone systems that have DNIC cards. The Superset 401+ offers fixed feature keys such as transfer and hold. In addition, the Mitel 401+ can set up a conference call. Six programmable buttons allow the Mitel 401+ can be used to configure additional features