Analog sets have two different mechanisms for dialing digits:
A rotary dial mechanism generating 1 to 10 pulses, representing the digits 1 to 9, and 10 pulses representing the digit 0. In CS 1000, this is the Dial Pulse (DIP) class of service.
A DTMF transmission mechanism using standard DTMF to provide the digits. In CS 1000, this is the Digit Tone (DTN) class of service.
The analog stations have their physical limitations when migrating to Device Adapter. That is, a station that can only do dial pulse still has to do dial pulse signaling, and a station that can only use DTMF has Digit Tone signaling. Stations that can switch between the two based on a switch on the phone can use either, but must use the value corresponding to the switch settings.
This information is needed by Device Adapter to allow it to use the required DTMF detection or dial pulse detection. The class of service values are entered as analog station features. Device Adapter uses the feature to handle the user’s digit entry correctly.
A rotary dial station uses the DIP feature.
A DTMF station uses the DTN feature.
If neither is present, then the station should not be analog.
Except for information feedback to the user, there is no user action. However, when the user presses 4, a DIP station does four-timed switch-hook-toggle pulses, to send the digit as pulses. A DTN user may hear tones.
