Nortel M3900 Key-Based 22-Button Expansion Module without Footstand - Charcoal (NTMN37)
The Nortel Networks M3900 Expansion Module is a key- based expansion module providing 22 additional line/feature keys. The M3904 and M3905 each support up to two expansion modules, for a total of 44 additional keys.
- Fully programmable
- Each button shows status of other PBX extensions
- LED indicator for line status
- Maximum of up to two key-based expansion modules to your digital M1 phone
- Ideal for busy receptionists, administrators, and managers
- For use with Nortel M1 Option 11C PBX System