Supplement to the answering set
Status v2.30


The answering set is an extension of the fax switch function type 2. It still is under development. In the following the current characteristics and possibilities are specified.



Listen to stored voice calls with the modem

Briefly press the green push-button in the initial mode.

Forward to voicesoftware

Activate "Voicemodem when forwarding" in the 'special flags'.


For adjustments the new menu 'answering set' can be found in the configuration mode under 'further adjustments':

  *** answering set ***

  (A) DLE string:         *
  (B) Recording time:     15
  (C) Bit/sample:         4
  (D) Sampling rate:      7200
  (E) Parameter:          00001000b
  (F) Baudrate modem:     57600
  (G) Handshake ON:       &K4
  (H) Handshake OFF:      &K3
  (X) Zurueck

Meaning of the settings

DLE string DTMF tones ('0'...'9', 'A'...'F', '*', '#'), directly activating the answering set.
Recording time max. recording time (1...99 seconds),
end also with long pauses (>3 seconds) and busy.
Bit/sample Number of bits per sample (2...8), depending upon modem and software.
(modem test: 'AT#CLS=8', 'AT#VBS=?')
Sampling rate Number of samples per second (e.g. 7200, 8000, 11025), depending upon modem and software.
(modem test: 'AT#CLS=8', 'AT#VSR=?')
Parameter Adjustment of details (see below)
Baudrate modem Baud rate, at which voice data is transfered from and to the modem.
Handshake ON Modem statement for switching on software handshake (Xon/Xoff).
Handshake OFF Modem statement for switching off software handshake (Xon/Xoff).

Meaning of the parameter bits

7 6 5 4 3 2 1 0
not used message delete monitor reserved default
0: no* 0: no 0: no* 0: * 0: no*
1: yes 1: yes* 1: yes 1: 1: yes
'*' = default

Baud rates and data

In order to transfer the voice data rapidly enough,
a minimal value must be configured here, dependent on the other adjustments:

Bit/sample x sampling rate x 10 / 8 = minimal baudrate


4 Bit/sample x 7200 Samples/sec x 10 / 8 = 36000 Bit/sec -> 38400
4 Bit/sample x 11025 Samples/sec x 10 / 8 = 55125 Bit/sec -> 57600

Memory requirements (e.g..):

4 Bit/sample, 7200 Samples/sec --> 3,5 KByte/sec
-> 36 sec in 128 KByte ( 2 calls of 15 sec)
-> 146 sec in 512 KByte (10 calls of 15 sec)

2 Bit/sample, 7200 Samples/sec --> 1,75 KByte/sec
-> 72 sec in 128 KByte ( 5 calls of 15 sec)
-> 292 sec in 512 KByte (19 calls of 15 sec)

Greeting message

Record or change message

  1. make sure, that no faxes/voicecalls are stored (forward faxes/listen to voicecalls and delete before)
  2. press the green push-button briefly; as described in 'listen to stored voicecalls' (when changing the message, first the old one is played)
  3. during the two 'end'-tones press and hold the green push-button
  4. when the green led lights up permanently, record message with the (external) modem microphone
  5. end recording by pressing the red push-button briefly
When no greeting message is present (after power-up), the green led flashed very fast. The first recording of the message is also possible with a normal voice call. Therefore the first incoming call must be a voice call with the greeting message.


The tones on the line are also checked while playing the greeting message. Therefore DLE-sequences and fax tones can be recognized. The 'fax detect time' can be configured to the smallest value. Problems can occur, because some (calling) fax modems "don't like" the greeting message and go on hook. So it is better not to use a too small value.

Test fax und greeting message

If the greeting message is enabled, the first side of the test fax is not signaled.

Deleting the memory

Deleting of the memory is possible independantly for the stored faxes and the voice calls. If transmitted to the software at least once, they can be deleted. For the voice calls alternatively it is sufficient to listen to them over the modem (see above 'parameters').