Caller ID Detection

Caller ID Detection

Initially, ACC was only intended for Incoming Call Line ID detection (CallerID detection). Later there were other service functions added, such as answering-machine, record-on-demand and play-on-demand functionality.

American Caller ID (CND, available in US, Canada, Australia...)

There is nothing special about CND. The number is detected by modem hardware when +CID=1 command issued.

Standard Caller ID message packet is being received after first RING in the following way:

RING

DATE = 0321

TIME = 1405

NMBR = 5045551234

NAME = A N OTHER

RING

RING

or, in the case where the tag of the packet is not recognized by the modem

RING

MESG = 060342424231

RING

RING

Sometimes you may receive Private or Out of Area message. 'Private' means that the remote caller decided to block his phone number and personal information. 'Out of Area' means that the telephone exchange was unable to resolve Caller ID information as a call was received from the area which is out of Caller ID service.

 

Russian Caller ID (RCID), available in Russia and some European countries.

Detecting RCID is much more complicated, because most of existing modems do not provide hardware support for RCID.

RCID signal is being sent after modem takes the call. So we have the following procedure:

There are some problems. First, modem hardware is rather slow, and delay between answering and sending request tone can exceed the time ATE will wait for RCID request. In this case it is recommended to set up TWO request tones in the 'Caller ID Detection' section of 'Properties' dialog.

Then, some ATEs send RCID packet without request. This means that when we send RCID request, some time will pass and part of the signal will already be transmitted. Solution is to set 'Pre-detect time' parameter in the 'Caller ID Detection' section of 'Properties' dialog to non-zero value (numbers around 100-200 milliseconds suspected). It is recommended to set 100 ms when using TWO request tones and 200 ms when issuing only ONE request tone. Generally pre-detect time should be ZERO.

RCID reception and decoding is performed inside of the program, not the modem hardware (if not using 'Hardware XXX' Caller ID type). This process can be controlled from within 'Actions' section of 'Properties' dialog, but generally there is no need to adjust this stage.

Number of 'ring back' tones emulated to line can be set from within 'Action' section of 'Properties' dialog. You can also change default action that will be performed after going online and/or emulating N 'ring back' signals to the line. You may choose from options like 'drop immediately' or 'after N 'ring back' tones'; or it can 'answer', 'set caller on hold' and even switch on 'answering machine'.

Topic link Which Caller ID to use?

Using Advanced Call Center Using Advanced Call Center