SIP IP Phone Models 53i, 55i, 57i, 57i CT Release Notes
Optional Equipment (for 55i, 57i, and 57i CT only)
Model 536M Expansion
Module
(for 55i, 57i, and 57i CT)
The 536M module adds 36 additional softkeys to the IP phone models 55i, 57i, and 57i CT. The 536M provides paper labels for each softkey. Up to 3 modules can be
536M
Expansion
Module
Module 560M Expansion
Module
(for 57i and 57i CT only)
The 560M module adds 60 additional softekeys to the IP phone models 57i and 57i CT (using the 3 function keys on the bottom right of the unit). The 560M module provides an LCD display for displaying softkey labels. Up to 3 modules can be
560M Expansion
Module
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