- Running out of lines? Slide a bigger keyboard onto your ROLMphone 612 or 624. When you need to add more lines or phone features the Keyboard Expansion Option provides 20 additional feature buttons and up to 29 lines. The Keyboard Expansion Option simply snaps into place on your ROLMphone 612 or 624.
- System Requirements/Compatibility:
- For system requirements and compatibility contact a Synergy Telcom Representative at 1-800-201-7590.