Expanding? Add up to 24 additional 4400 series digital telephones.
Features
024 TDL
Capacity: 24 digital extension jacks; each extension jack is assigned 2 extension numbers. The second extension number can be used as a phantom extension (for example, for voice mail configurations).
Supports: 4400, 4400D, 4406D+, 4412D+, 4424D+, 4424LD+, and TransTalk 9040 (Release 1.5 and later systems) telephones