The Aastra Meridian 522 expansion module is compatible with both the M5216 and M5316. The M522 is a 22-button expansion unit, with associated LCD indicators, providing additional keys for lines or features. You can use up to 2 expansions, for a total of 44 extra programmable buttons.
522 Features:
- Programmable Key Expansion Module
- Class / CMS Compatible Features
- 22-Button Expansion Unit
- Offers Mini Console Capabilities
- Provides Additional Keys For Lines Of Features
- Up To Two Expansions Can Be Used For Up To 44 Extra Programable Buttons (5216 Only)
**Aastra Meridian 522 Will Not Work Without The Meridian 5216 or 5316 Model Phones**
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