The idea behind CCS7 is that each user of CCS7 has a unique DTMF number assigned to their call sign, which is allocated by the DMR-MARC Database. If you don’t have a CCS7 DTMF, it’s important that you obtain one so you can use the DCS reflectors! You can visit their web pages at http://ham-digital.net/
Using CCS7 is very simple, it’s like dialing a phone number from your radio. A user or gateway DTMF will consist of (7) digits. The first (4) digits identify the users home country and state, the last (3) are the user.
To use CCS7 to connect to a user or repeater/gateway, simply enter that number into your DTMF keypad on your D-Star radio and the CCS7 system will map that number to a callsign. A link will be made to the repeater where the remote callsign was last heard, and the link will follow your QSO partner if they change repeaters.
Here is how to connect to user ‘31330000’ :
DTMF ‘3133000’
URcall ‘C3133000’
When you issue an outgoing CCS7 DTMF, the gateway will respond with the standard “Linked to ….” voice message and slow data text as if linked to a reflector. If the CCS number is unknown then the gateway will report “Not linked” by voice and the slow data text will give more details of the reason. An outgoing CCS7 link from a repeater will cause all existing reflector links to be ended, however an incoming CCS7 link to a repeater will not affect any link status but will cause a voice message to be emitted.
When you are done with your QSO, you can end the session by entering a DTMF ‘A’ from your mic keypad or after 5 minutes of inactivity, the link to the CCS7 user or CCS7 remote gateway will end automatically.
Here is how to end the connection :
DTMF ‘A’
URcall ‘ C’
Like all things D-Star, there are limitations and caveats to how this works. Some repeater/gateways will not support the CCS7 DTMF. The best way to try is to TRY!