Aastra Telecom Pro 160 - Manual (Page 205)

Aastra IP Phone Model 536M and 560M Expansion Modules
41-001134-05, Rev 00, Rel. 1.1 A-57
Aastra IP Phone Model Reference
Aastra IP Phone Model 536M and 560M Expansion
Modules
The 53i, 55i, 57i and 57i CT IP Phones offer optional expansion modules that
attach to the right side of the phone to provide additional softkeys.
Model 560M (Model 55i, 57i, 57i CT)
Model 536M (Model 53i, 55i, 57i, 57i CT)