Panasonic KX-TVA50 Voice processing System, 2 Ports Built In, Expandable up to 6 ports, up to 8 hours voice storage.Line Capacity (2 ports Built In, expandable to 6)Voice Storage (up to 4 hours, expandable up to 8 hours)Number of Mailboxes (Max. 64 boxes)Number of Messages unlimi..
Panasonic KX-TVA503 2-Port Digital Expansion Card2 Port DPT Interface CardSupports DPITS integration onlyExpands port capacity of the system by 2Capacity: 2 per systemUse with KX-TVA50 voice processing system..
Panasonic KX-TVA502 2-Port Hybrid Expansion Card2 Port DPT/APT/SLT Interface CardSupports DPITS, APITS, and in-band integrationExpands port capacity of the system by 2Capacity: 2 cards per systemUse with KX-TVA50 voice processing system..