Aastra Telecom 57I CT, 55I, 53I manual Description, References

IP Phone Administrator Guide IP Phone Models

Overview

IP Phone Models

Description

The IP Phone Models 53i, 55i, 57i, and 57i CT communicate over an IP network allowing you to receive and place calls in the same manner as a regular business telephone.

All phone models support the Session Initiation Protocol (SIP). The 57i CT offers the base phone along with a cordless extension.

References

For more information about the features and installation requirements, see the SIP IP Phone Installation Guide for your specific model.

The following illustration shows the types of IP Phone Models.

53i 55i

57i 57i CT

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