2 Wire 12 Way DTMF Telephone

As per RDSO Specn. IRS:TC-60/2007

2 Wire 12 Way DTMF Telephone

The Selective calling systems is based on DTMF dialing and works on 2 wire line where one telephone works as the MASTER with up to 10 SLAVES.The master and slave numbers can be assigned/selected by the user as no. 1 for MASTER and * or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 and 0 for the SLAVES.

These numbers are selected through Jumpers inside the telephone housing. All slaves can communicate amongst themselves as well as the MASTER while master can call either one or all the SLAVES at the same time by dialing #.