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2420 Digital Telephone End User Guide | 1 | P a g e is a multi-line digital telephone for use with an Avaya MultiVantage™ software 1.1 or later. It is. This guide covers the use of the 2420 phones on IP Office. 2420. 1.Display, Call Appearance and Feature Buttons: Call Appearance keys enable you to handle 2420 Digital Telephone Quick Reference 555-250-201, Issue 3, Avaya call server, the Home screen, the Speed Dial To make a call manually.You can make calls from the 2420 telephone using a variety of methods. To make a call manually. 1. Go off hook using the handset, headset, or speaker. 2. When To make a call manually: 1. Go off hook using the handset, headset, or speaker. 2. When you hear dial tone, enter the extension or telephone number using the.