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DB-25 Serial Port
The Inter-Tel 8690 is the perfect phone for the person who wants a technologically advanced IP phone
The Adtran Atlas 550 resource host module is a add on module for the Atlas 550 gateway
200 Communications Server
5s from the OC-3 interface to the optical multiplexer modules
Yealink SIP-T20P IP Phone 2 Line Power:Add Power Supply DB-25 Serial PortYealink SIP T20P IP Phone 2 Line Description: The Yealink SIP T20P is a standard desktop phone for cubicle workers. The SIP T20P operates using the Session Initiation Protocol (SIP) and has broad interoperability with various phone systems including Asterisk. The IP phone can carry G. 722 HD audio along with a full duplex speakerphone for hands free conversations. Two programmable keys on the Yealink SIP T20P can be used to register a pair of SIP
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