Using the Avaya J139 IP Phone SIP

This document serves as a comprehensive guide for end-users of the Avaya J139 IP Phone, designed for modern business communication needs. It details how to effectively utilize the phone's extensive features, from basic call operations to advanced customization and troubleshooting.

Key Features and Functionality

About Avaya

Avaya is a global leader in business communication solutions. For more information about Avaya products and services, visit Avaya's official website.

For support and additional documentation, please refer to the Avaya Support website.

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