- Panasonic Business Telephones TVA503 2 Port DPITS Expansion (KX-TVA503)
- Manufacturer: Panasonic Business Telephones, Model: KX-TVA503
- 2 Port DPT Interface Card- Supports DPITS integration only - Expands port capacity of the system by 2 - Capacity: 2 per system - Use with TVA50 voice processing system