The number of ports is usually the most important specification of a voice processor. It indicates the number of simultaneous conversations that can be handled: callers from the outside, as well as people within your business or home who are checking or leaving messages.
| Model | number of ports | number of mailboxes | recording time |
| KX-TVA50 | 2 to 6 | 64 | 4 or 8 hours |
| KX-TVS50 (discontinued) |
2 | 32 | 2 or 4 hours |
| KX-TVS75 (discontinued) |
2 | 64 | 6 hours |
| KX-TVS80 (discontinued) |
2 | 64 | 6 hours |
| KX-TVS90 (discontinued) |
2 | 64 | 6 hours |
| KX-TVS95 (discontinued) |
2 | 64 | 6 hours |
| KX-TVS100 (discontinued) |
2 or 4 | 64 | 18 hours |
| KX-TVS110 (discontinued) |
2 or 4 | 64 | 18 hours |
| KX-TVS120 (discontinued) |
4 or 6 (KX-TD & KX-TA1232) 4 (KX-TAW848) |
64 | 32 hours |
| KX-TVS125 (discontinued) |
4 or 6 (KX-TD & KX-TA1232) 4 (KX-TAW848) |
64 | 32 hours |
| KX-TVA200 | 4 to 24 | 1024 | 1000 hours |
| KX-TVS200 (discontinued) |
4 or 8 or 12 (KX-TD &
KX-TA1232) 2, 4, or 6 (KX-T123211D) |
1024 | 32 hours |
| KX-TVS220 (discontinued) |
4 or 8 or 12 (KX-TD & KX-TA1232) | 1024 | 64 hours |
| KX-TVS225 | 4 or 8 or 12 (KX-TD & KX-TA1232) | 1024 | 64 hours |
| KX-TVS300 (discontinued) |
4, 8, 16, or 24 (KX-TD) | 1024 | 64 hours |
| KX-TVS320 (discontinued) |
4, 8, 16, or 24 (KX-TD) | 1024 | 128 hours |
| KX-TVS325 (discontinued) |
4, 8, 16 or 24 (KX-TD) | 1024 | 128 hours |