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1408/1416 Phone User Guide Page 2 IP Office 15-601040 Issue 11a (Friday, April 20, 2018). Avaya reserves the right to make changes and corrections to the information in this document without the obligation to notify any person or organization of such changes. Documentation disclaimer. Avaya 1408/1416 Digital Phone User GuideAvaya 1408/1416 Digital Phone User Guide Answering and Making Calls Answering a call If you are not already on a call, lift the handset. If you are already on a call, press the alerting call appearance button (slow flashing green lamp) puts the existing.