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Avaya J129 is an entry-level IP phone for basic users, cubicles, and public spaces. This model of J129 features third-party call control (3PCC) using the open SIP protocol, so you can use it with standards-based SIP phone systems. It cannot be used with Avaya Aura or Avaya IP Office.
Avaya J129 is a full-featured VoIP phone. It supports one SIP line and two concurrent calls. The display and three soft keys make it simple for anyone to operature. You get exquisite audio from both the handset and speakerphone. It features enterprise-class security with TLS and SRTP encryption and supports PoE power.