1) TC-104C / TC-106C / TC-108C
These model are single communication path, allows only one pair of people are talking at the same time.
2) TC-206D
This model is three communication path, allows three pair of people are talking at the same time.
Main Functions of TC-104C/106C/TC-108C
1) Make outside call by code ( Speed Dialing)
2) Assistant dialing ( for outside call)
3) Three party conference ( 1 CO + 2 Extensions)
4) Call Pickup and Call Transfer
5) Outside call class assignment
6) Outside call time limited
7) Auto add IP code for outside call
8) Auto detect Fax signal
9) FSK / DTMF caller ID
10) Operator attendant mode
11) OGM for auto-attendant mode
12) Music on holding