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These ShoreTel handsets fit many models including those listed below
21 universal synchronous serial interface (USSI) connections for an Atlas 800 series gateway
096 Mbps total)
remote access
Adtran 1200338L1 Features:
Adtran Atlas 550 T1/PRI Network Interface Module 1200307L2 Condition:Refurbished These ShoreTel handsets fit manyAdtran Atlas 550 T1 PRI Module 1200307L2 Description: The Adtran Atlas 550 T1 PRI network module provides the Atlas 550 with a single T1, PRI, or DSX 1 interface to your integrated Access Device. The 1200307L2 plugs into the network interface module slot. Adtran 1200307L2 Features: Provides Channelized 23D+1B Connection Provides a single T1, PRI, or DSX 1 interface. Can only be used in the network interface module slot.
