Making a phone call?

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Hi,

   I'm using mgetty/vgetty since a couple of weeks. I can receive 
and send faxes properly as well as I can register voice messages.
I read the FAQ and part of the archive. Also I subscribed and read the
mailing lists a couple of days. I figured I made a reasonable effort to 
find an answer but I didn't.  My problem is:

I'm at home and I share my phone line with the modem ( only one line).
When I try to make a phone call ( dialing out) the modem answers me and
plays the welcome message. This cause confusion because at one moment
I can hear the welcome message and the person at the other end.

The only solution I found to cure the problem was to comment the following
2 lines in voice.conf

#dtmf_len 30

#
# DTMF tone detection threshold in percent (0% to 100%). Increase this
# if the modem erroneously detects DTMF tones, decrease it if it fails to
# detect real ones. This is currently only supported by ZyXel modems
# with a ROM release of 6.12 or above. The default is 40%.
#

#dtmf_threshold 80

I'm not an expert. I would like to know if my solution is ok (proper)?
What would be a better solution?
 and what are the potential consequences of my solution. (for the moment
I'm not using voice mail)?

By the way I would like to know(understand) what is the meaning and
exact role of DTMF tone? The modem isn't suppose to wait X rings (3 in my
case) before answering an incoming call, not and an outgoing one?

Maybe I missed something but I want to understand! 
Thanks for your time and any help or references you could supply.

My system: Linux PENTIUM 2.0.35 #2 Fri Sep 18 10:35:16 EDT 1998 i586    

A sample of my /etc/inittab
============================= 
mo:235:respawn:/usr/local/sbin/vgetty /dev/ttyS1
============================
A sample of vgetty.ttyS1
========================

11/29 11:00:50 yS1  vgetty: experimental test release 0.9.0 / 09Sep98
11/29 11:00:51 yS1  mgetty: experimental test release 1.1.18-Sep11
11/29 11:00:51 yS1  reading generic configuration from config file
/usr/local/etc/mgetty+sendfax/voice.conf
11/29 11:00:51 yS1  reading program vgetty configuration from config file
/usr/local/etc/mgetty+sendfax/voice.conf
11/29 11:00:51 yS1  reading port ttyS1 configuration from config file
/usr/local/etc/mgetty+sendfax/voice.conf
11/29 11:00:51 yS1  check for lockfiles
11/29 11:00:51 yS1  locking the line
11/29 11:00:51 yS1  can't get group 'modem': No such file or directory
11/29 11:00:51 yS1  lowering DTR to reset Modem
11/29 11:00:52 yS1  send: \dATQ0V1H0[0d]
11/29 11:00:52 yS1  waiting for ``OK'' ** found **
11/29 11:00:53 yS1  send: ATS0=0Q0&D3&C1[0d]
11/29 11:00:53 yS1  waiting for ``OK'' ** found **
11/29 11:00:53 yS1  mdm_send: 'ATI'
11/29 11:00:53 yS1  USR Courier/Sportster 56k detected
11/29 11:00:53 yS1  mdm_send: 'ATI3'
11/29 11:00:53 yS1  additional info: 'U.S. Robotics 56K Voice INT V4.7.35'
11/29 11:00:53 yS1  mdm_send: 'AT+FCLASS=2.0' -> OK
11/29 11:00:53 yS1  mdm_send: 'AT+FAA=1;+FCR=1' -> OK
11/29 11:00:54 yS1  mdm_send: 'AT+FBO=1' -> OK
11/29 11:00:54 yS1  mdm_send: 'AT+FNR=1,1,1,0' -> OK
11/29 11:00:54 yS1  mdm_send: 'AT+FLI="450-625-5703"' -> OK
11/29 11:00:54 yS1  mdm_send: 'AT+FCC=1,5,0,2,0,0,0,0' -> OK
11/29 11:00:54 yS1  detecting voice modem type
11/29 11:00:55 yS1  US Robotics detected
11/29 11:00:56 yS1  US Robotics voice modem
11/29 11:00:56 yS1  This is a driver beta version. V0.4.b3
11/29 11:00:56 yS1  VTD setup successful
11/29 11:00:57 yS1  waiting...
====================================

Gilles Labrecque
labrecg@odyssee.net