Sat Jul 24 14:26:46 MEST 1999  Marc SCHAEFER  <schaefer@vulcan.alphanet.ch>

	* doc/Readme.voice_shell: updated with the new commands.
	
Tue Jul 20 08:49:10 MEST 1999  Marc SCHAEFER  <schaefer@vulcan.alphanet.ch>

	* Timeouts for ringback: if no ringback is detected within the timeout
	time, the modem assumes the other side answered the phone (was
	needed for outgoing dial). Note that not all modems support these
	commands (+VRA/+VRN). Notably the Multitechs don't. This adds new
	configuration options: ``ringback_goes_away'' and
	``CONF(ringback_never_came, 100, CT_INT)'', see include/default.h
	and voice.conf-dist.
 	
	* The US Robotics modem forgets its voice setting when it leaves voice
 	mode: a special function voice_mode_on() was created.
 	
	* Sending a beep to US Robotics turns the speaker on, we shut it
 	down (best way would be to keep it how it was).
 	
	* Added ``GET MODEM'' voice shell interface command to get the
 	underlying modem hardware type (e.g. for sending the right RMD file
 	type).
 	
	* Added a new ``linger'' optional argument to the play command. When
 	given, it will make the multi-DTMF detection more reliable when used
 	with ``AUTOSTOP'': with some modems, or with some configurations, it
 	seems that between the time ``PLAY'' and ``WAIT'' are issued you can
 	loose key-presses, especially with US Robotics modems.

	* All the above for Jul 20 was submitted by Al BORCHERS,
	<alborchers@steinerpoint.com>

Sun Jul 18 19:31:49 MEST 1999  Marc SCHAEFER  <schaefer@vulcan.alphanet.ch>

	* Incremental bug fix for US_Robotics.c submitted by
	"Luca Olivetti" <luca@olivetti.dhis.org> for the external or
	internal speaker beep conflicting with line work-around.
	
	* Added EXTERNAL_SPEAKER support in shell.c, contributed
	by "Luca Olivetti" <luca@olivetti.dhis.org>.

	* Added some files in contrib/
	
Sun Jul  4 09:13:10 MEST 1999  Marc SCHAEFER  <schaefer@vulcan.alphanet.ch>

	* Fixed libutil/access.c to set EGID before EUID so that it is
	possible.
	
Sun Jun 27 12:16:20 MEST 1999  Marc SCHAEFER  <schaefer@vulcan.alphanet.ch>

	* The owner, groups and mode were only set after the file
 	recording was complete. Moreover, the file was created without any
 	correct security checks. Now, we switch the EUID/EGID/umask of the
 	process when opening the file. That should fix the specific user
 	request (not having files root.root 644 when recording), and also
 	fix more serious security problems. Additionnally, we now do the
 	same when playing a file. This is done through a new set of
	functions in libutil/access.c. Problem reported by
	uzs7ph@uni-bonn.de.

	* Calling the new function setup_environment() from
	vgetty/answer.c's vgetty_answer function. This renders *some*
	of the called-ID specific patch obsolete, and it was slightly
	rewritten for that purpose. This was suggested by gert.

	* Added new set_device mode definitions (suggestion by
	Steffen Klupsch <steffen@vlsi.informatik.tu-darmstadt.de>, see
	also voice/contrib/Steffen_Klupsch-new-set-device-modes).

Tue Jun 15 14:28:20 MEST 1999  Marc SCHAEFER  <schaefer@vulcan.alphanet.ch>

	* Added a modem quirk field in the include/hardware.h modem structure.
	Defined VMQ_NEEDS_SET_DEVICE_BEFORE_ANSWER to reverse, if set, the
 	order of answering/setting line for the modems which are broken in
 	that aspect. This field is set to zero for all modems, except
	UMC. Reported by steffen@informatik.tu-darmstadt.de.

	* Fixed bug with Compaq_VS.c which had the recently added
	play_dtmf missing (should have seen that in compilation, hey ?).

	* Added an unconditionnal ``go to voice mode'' in libvoice/UMC.c,
	this fixes the ``modem doesn't know in which state he is'' bug
	reported & fixed by steffen@informatik.tu-darmstadt.de.

	* Modified vgetty/answer.c to support the above modem quirk bit.

	* libvoice/UMC.c: fixed the 'beep' command, the UMC_VTS_WORKAROUND
 	produced a horrible and loud scream, the modem command at#vts
 	sounds better :-) (steffen@informatik.tu-darmstadt.de).

	* libvoice/UMC.c: setting default compression to 4 bit ADPCM,
 	because only this is supported by the pvftools.

	* Changed the faxmode command from 'AT+FCLASS=' to 'AT#CLS='
	-- this is said to be better regarding call discrimination.
 	(At least for UMC modems.)

	* voice/pvftools/pvftormd.c and voice/pvftools/rmdtopvf.c:
	added support for UMC's 4 Bit ADPCM.
	
Sat May 15 21:53:52 MEST 1999  Marc SCHAEFER  <schaefer@vulcan.alphanet.ch>

	* Added information/patch for old 5.x 1496 ZyXEL. As those
	problems are no longer found with the current 6.x ROM version
	(such as 6.19), I just include the information/patch as-is
	in voice/contrib/Wolfram_Gloger
	
	* Added script example to make MultiTech 2834ZDXv dial out and
	play voice message to voice/contrib/Mark_Haun

	* RING_DETECTED is now supported as an event in WAITING (event.c)

	* Added temporary Smarty/Neuhaus detection. This could break
 	Rockwell modems. In case it does, change the #if 0 at line
	63 to #if 1 and report this to me (detect.c). Contributed by
	Raoul.Boenisch@uni-essen.de.

	* Enabled support for the INTERNAL_MICROPHONE for Dr_Neuhaus.c
	(for the Smarty; contributed by Raoul.Boenisch@uni-essen.de)

	* Fixed Multitech_2834.c: would not go correctly to
	DIALUP_LINE (but to LOCAL_HANDSET instead). Submitted
	by alborchers@steinerpoint.com. Same fix reported
	to the other instances (5634, but NOT 5600ZDXv since
	already fixed it seems).

	* Fixed Multitech_2834.c: sometimes the fixup echo
	workaround wouldn't work with some firmwares. Made it so
	the fix is inactive if echo is disabled. Reported this
	fix to  the other instances (5634, but NOT 5600ZDXv since
	already fixed it seems).
	Submitted by alborchers@steinerpoint.com

	* US_Robotics.c:
	     - added URL for technical documentation
	     - patch by gmilner@my-dejanews.com for local handset support
	     - patch by Niels@Basjes.nl to ignore DIAL TONE when
	       recording or playing (bug work-around).

	* Updated ToDo files

	* Updated the FAQ. Warning, this might not be in sequence with
	  the official FAQ. This has to be worked-around some time now.
	
Tue Mar 16 11:02:26 1999  Marc SCHAEFER  <schaefer@vulcan.alphanet.ch>

	* Fixed so that when PNP detection fails (ATI9) we correctly
	revert to ATI, eating output when needed. This was reported by
	Al Borchers alborchers@steinerpoint.com. This should fix
	many problems encountered by people upgrading to 1.1.20
	plus the 10021999 global patch.

Wed Feb 10 07:17:57 1999  Marc SCHAEFER  <schaefer@vulcan.alphanet.ch>

	* Many changes which are documented below:
	     voice/Readme
		Changes about maintenance. 
	     doc/Readme.pvftools
		Contributed by Daniel Doering
	     doc/Readme.voice_shell
		Augmented with new commands (DTMF)
	     Almost all modem-specific include files and implementation files
		Added support for play DTMF from voice script
	     libpvf/rockwell.c	  
		Additions by Bill Nugent <whn@topelo.lopi.com> for the
		PCM format.
	     libvoice/README.lucent
		Some information about that chipset
	     libvoice/detect.c
		Added PNP detection by Rob Ryan <rr2b@pacbell.net>
	     libvoice/event.c
		Fixed so that a NUL in the debug stream doesn't corrupt the
 	        logs.
	     libvoice/shell.c
		Added new command DTMF
	     pvftools/extract_gsm
		Perl script to extract GSM data for US Robotics Sportster Vi
	     pvftools/pvftormd.c
		See libpvf/rockwell.c
	     pvftools/usrgsm.c
	     pvftools/usrgsm.mk
		Presumably the same as pvftools/extract_gsm
	     pvftools/wavtopvf.c
		Added information in usage that it doesn't support stereo.
	     scripts/convert_wav_to_rmd.sh
		Because of wavtopvf not supporting stereo, I contributed a
		script using SOX to convert stereo WAV to a modem RMD format.
	     vgetty/answer.c
		Moved the switching to the voice line AFTER answering, else
		would sometimes hang X.75 on a ZyXEL 2864I (anyway it's
		better that way).
	     vm/main.c
		Support for DTMF
	     voice/voice.conf-dist
		Added comment that setting rec_max_len to zero skips recording.
	     voice/xvoicetool/
		Added

	  New modem beta-supported
	     Multitech_5634ZBAV
	     Multitech_5600ZDXv
	     Supra
		(see details at
		    http://home.earthlink.net/~eboreg/Supra.html
		 or information in voice/libvoice/README.Supra)
		This include ``PNP-detection'' changes.
		By Rob Ryan <rr2b@pacbell.net>.
	
Wed Feb 10 07:17:57 CST 1999  Rick Richardson  (rick@dgii.com)

     * Fixed a bunch of places where feof() was being misused in
       the pvftools and library.

     * Added -c option to pvffile to print sample counts.

     * Added some more voice support for Digi RAS modems.

Wed Sep 09 08:39:13 1998  Marc Eberhard  (marc@athene)

     * New vgetty release.

Sat Apr 12 16:48:31 1997  Marc Eberhard  (marc@athene)

     * New vgetty release with many minor changes.

Sat Jan 25 10:16:06 1997  Marc Eberhard  (marc@nepomuk)

     * Many changes including complete rewrite of the pvftools.

Tue Dec 10 20:08:57 1996  Marc Eberhard  (marc@nepomuk)

     * Most hardware drivers are working again.

Thu Nov 07 19:23:08 1996  Marc Eberhard  (marc@nepomuk)

     * Changed lots of stuff and fixed many bugs. Most hardware
       drivers are disabled, because they are broken.

Tue Aug 06 21:53:01 1996  Marc Eberhard  (marc@nepomuk)

     * Hopefully fixed the timeout problem.

     * Added new hardwre driver event to switch to data or
       fax mode.

     * Added fully documented config file.

     * Other minor changes.

Fri Jul 19 07:54:56 1996  Marc Eberhard  (marc@nepomuk)

     * Wrote new driver for the Dr. Neuhaus Cybermod.

     * Many small changes and fixes.

Tue Jun 25 22:24:52 1996  Marc Eberhard  (marc@nepomuk)

     * Added Mitch DSouza driver for Cirrus modems.

     * Added various patches.

Sat Feb 03 11:16:53 1996  Marc Eberhard  (marc@nepomuk)

     * Added Ard van Breemens driver for Rockwell modems.

     * Added various compatibility patches.

     * Added Ulrich Homanns driver for UMC Phonemaster modems.

Mon Jan 29 06:55:54 1996  Marc Eberhard  (marc@nepomuk)

     * Added Steve Wormleys US Robotics hardware driver.

     * Added Torsten Duwes patch for the pvf tools and his new converter
       for Rockwell voice data.

     * Changed the directory layout, because some file names were too long
       and caused trouble.

Sat Dec 30 01:15:25 1995  Marc Eberhard  (marc@nepomuk)

     * First public release of the new vgetty code. Probably many bugs,
       because this release was produced under heavy time pressure.

Thu Oct 05 22:34:51 1995  Marc Eberhard  (marc@nepomuk)

     * Pre release of the new generation vgetty code.  Major changes to all
       files, but not finished yet.

Wed Apr 12 19:26:04 1995  Marc Eberhard  (marc@nepomuk)

     * New beta release.

     * Removed all static #ifdef's and replaced them by normal if's to
       support runtime configuration in the future.

Sun Apr 09 21:46:18 1995  Marc Eberhard  (marc@nepomuk)

     * New beta release.

     * Only minor cleanups.

Thu Apr 06 08:41:08 1995  Marc Eberhard  (marc@nepomuk)

     * Flowcontrol problem pointed out by Wolfgang Jung. Partial fix for
       now.

Wed Apr 05 18:10:36 1995  Marc Eberhard  (marc@nepomuk)

     * Fixed the bug reported by Wolfram Gloger. Now voice_rings returns the
       correct number for rings_wanted when invoked multiple times instead
       of decrementing rings_wanted on each invokation until it's one.

Mon Apr 03 18:17:43 1995  Marc Eberhard  (marc@nepomuk)

     * Makefile changes for portability

Mon Apr 03 10:45:47 1995  Marc Eberhard  (marc@nepomuk)

     * New beta release

     * Minor changes for portability

Thu Mar 30 20:03:20 1995  Marc Eberhard  (marc@nepomuk)

     * New beta release

     * Many changes to the Makefile

     * Added dialout support for zplay

Fri Oct 28 21:03:11 1994  Klaus Weidner  (klaus@snarc)

     * Makefile: new REL

     * zplay.1, zplay.c: fixed the -T documentation - range from 0..1

     * vmodem.c, voclib.h: always use 38400 bps for Rockwell modems.

Fri Oct 21 00:52:09 1994  Klaus Weidner  (klaus@snarc)

     * Makefile: new REL

     * zplay.1: updated zplay documentation to be less ZyXEL specific,
     expanded some sections.

     * zplay.c, zplay.1: documented -I and -K zplay options

Fri Oct 21 00:22:28 1994  Klaus Weidner  (klaus@snarc)

     * voclib.c: Use integers instead of symbolic values for VOICE_SEND_BAUD

     * vmodem.c: move the DTMF sensitivity parameters to voclib.h

     * voclib.h: move the DTMF sensitivity parameters to voclib.h
     Use integers instead of symbolic values for VOICE_SEND_BAUD

Thu Oct 20 00:28:15 1994  Klaus Weidner  (klaus@snarc)

     * vanswer.c: pass caller id to vg_message

Wed Oct 19 23:46:19 1994  Klaus Weidner  (klaus@snarc)

     * voclib.h, vmodem.c, vanswer.c:
     moved enter_data_mode() to vmodem.c, Rockwell changes

Sun Oct  9 12:29:30 1994  Klaus Weidner  (klaus@snarc)

     * vmodem.c, voclib.c, voclib.h:
     fixed compression type determination for non-ZyXEL playback

     * pvfadpcm.c: include <string.h> instead of <strings.h>

Sun Aug 21 14:17:26 1994  Klaus Weidner  (klaus@snarc)

     * Makefile, vanswer.c, voclib.c, voclib.h, zplay.c:
     Improved the asynchronous response handling, all
     dtmf codes sent by the modem should get caught now.

     * Makefile: new REL

Sat Aug 20 20:13:11 1994  Klaus Weidner  (klaus@snarc)

     * Makefile: new REL

Sat Aug 20 20:09:47 1994  Klaus Weidner  (klaus@snarc)

     * zplay.c: asynchronous DTMF handling
     -I <string>: ignored DTMF codes
     -K: kill buffered input

     * vanswer.c, voclib.c, voclib.h: new-style asynchronous DTMF handling

     * vgetty.c, voclib.h, vanswer.c:
     support 'rings <n>' line in /etc/answer.DEVICE

     * vanswer.c:
     fixed the answer_mode handling, be more picky about what kind of calls
     are accepted. Handle <DLE>e data calling tone.

Sun Aug 14 08:38:08 1994  Klaus Weidner  (klaus@snarc)

     * vanswer.c: differentiate data and fax calls better

     * pvfadpcm.c: print error message for non-ZyXEL voice files

     * voclib.h, voclib.c, vmodem.c:
     Put the modem type in the voice file header

     * voclib.c: fixed alarm handling in voice_wait_for

Sat Aug 13 12:10:39 1994  Klaus Weidner  (klaus@snarc)

     * vmodem.c: changed wrong k&r prototype

Mon Aug  8 23:13:22 1994  Klaus Weidner  (klaus@snarc)

     * listen.in: vplay support

     * vg_dtmf.in: compatibility fixes for bourne shells

     * vmodem.c: added break to make SunPro compiler happy

     * vmodem.c, vanswer.c, vgetty.c: repaired distinctive RING handling

     * pvfadpcm.c:
     added missing brackets to & operator, fixed dispatcher for adpcm4

     * voclib.h: VOICE_REC_COMPRESSION=4 by default

     * Makefile: added ../goodies.o, pvftoadpcm4, new $REL

Tue Jul 26 23:58:05 1994  Klaus Weidner  (klaus@snarc)

     * vmodem.c: use hardware flow control for ZYXEL_ROM >= 6.13
     use AT#CLS=0 to turn off voice mode for Rockwell

     * pvfadpcm.c, pvfmain.c: added 4-bit ADCPM mode

     * voclib.c: wait for DLE ETX properly when finishing recording
     moved flow control setup to vmodem.c

     * voclib.h: new 4-bit ZyXEL adpcm format

Tue Jul 26 13:53:01 1994  Klaus Weidner  (klaus@snarc)

     * pvf.1: updated pvflin section

     * listen.in, play_messages.in, vg_button.in, vg_call.in, vg_dtmf.in, vg_fft.in, vg_message.in, vg_nmp.in, vg_say.in:
     replaced /bin/sh with @SHELL@

     * voclib.c: don't throw away recording if modem erroneously reports 's'

     * voclib.c: fixed voice_wait_for return code

     * vanswer.c: cleaned up get_answer_mode

     * vanswer.c: replaced Device with DevID

     * pvflin.c: added -16i flag

     * vgetty.c: added gert's latest changes

     * vanswer.c: fixed strstr hack

     * voclib.c: added sys/{types,wait}.h includes

     * vg_dtmf.in: fixed one-liner syntax so that /bin/sh doesn't barf

     * zplay.c: -l didn't work for /dev/cua/a type devices

     * voclib.c: handle /dev/cua/a style device names

     * pvflin16i.c: Initial revision

     * vanswer.c: made get_answer_mode static

     * voclib.h: removed get_answer_mode prototype

Mon Jun  6 20:39:44 1994  Klaus Weidner  (klaus@snarc)

     * zplay.c: silence threshold was erroneously set to zero

     * pvf.1: added -kill option to pvffft

     * pvffft.c:
     added -kill option, send SIGPIPE when done reading to avoid blocking
     the calling process due to a full pipe.

     * voclib.c:
     made sure signals won't cause data corruption due to interrupted
     read()s

Sun Jun  5 21:47:04 1994  Klaus Weidner  (klaus@snarc)

     * Makefile: removed listen

Sun Jun  5 13:09:21 1994  Klaus Weidner  (klaus@snarc)

     * Makefile: new REL

     * vg_fft.in, pvffft.c, pvf.1: added command line args for pvffft.

     * vgetty.c: added TIOCSCTTY hack

     * vanswer.c: be more paranoid about wait()s

     * voclib.c: added missing wait() for the fft program

Sat Jun  4 13:30:56 1994  Klaus Weidner  (klaus@snarc)

     * vmodem.c:
     fixed bug that was erroneously setting the speaker volume to zero

Tue May 31 20:34:36 1994  Klaus Weidner  (klaus@snarc)

     * Makefile: removed listen.in (now in contrib/dialog)

Sun May 29 23:36:13 1994  Klaus Weidner  (klaus@snarc)

     * pvffft.c: replaced PI with M_PI

Sun May 29 14:55:25 1994  Klaus Weidner  (klaus@snarc)

     * vanswer.c:
     fixed voice_button, pick up the phone if rings were detected

Fri May 27 21:55:03 1994  Klaus Weidner  (klaus@snarc)

     * voclib.h, pvffft.c: rearranged and rewrote the comments

Fri May 27 20:34:45 1994  Klaus Weidner  (klaus@snarc)

     * zplay.c: added -F option (do FFT)

     * vmodem.c: increased dtmf threshold again

     * speakdate.pl: added space in ordinals

     * pvf.1, pvfmain.c: added pvffft

     * vg_fft.in, pvffft.c: Initial revision

     * Makefile, vpaths.c, vmodem.c, voclib.h, voclib.c:
     added support for data/fax switching using fft analysis

Thu May 26 16:47:31 1994  Klaus Weidner  (klaus@snarc)

     * Makefile, vmodem.c, voclib.h: print release number in the log file

Wed May 25 18:22:32 1994  Klaus Weidner  (klaus@snarc)

     * vmodem.h: Initial revision

     * voclib.c, vanswer.c, vmodem.c, voclib.h, zplay.c: support for
     rockwell modems

Wed May 11 22:07:36 1994  Klaus Weidner  (klaus@snarc)

     * vmodem.c: raised the dtmf threshold

Fri May  6 13:50:02 1994  Klaus Weidner  (klaus@snarc)

     * vmodem.c: added DTMF threshold setting for >=612

Thu May  5 18:44:26 1994  Klaus Weidner  (klaus@snarc)

     * Makefile: speakdate -> speakdate.{sh,pl}

Thu May  5 11:25:41 1994  Klaus Weidner  (klaus@snarc)

     * vmodem.c, voclib.c, voclib.h:
     new functions voice_send_init and voice_record_init

     * speakdate.pl: Initial revision

Tue May  3 22:03:50 1994  Klaus Weidner  (klaus@snarc)

     * vgetty.c: added missing break

     * listen.in, vg_message.in, vg_nmp.in, voclib.h:
     put .flag and .timestamp into incoming dir

Sun May  1 23:02:34 1994  Klaus Weidner  (klaus@snarc)

     * Makefile: removed CHANGES

     * pvf.1, pvfadpcm.c: added -r612 flag

Sun May  1 22:53:58 1994  Klaus Weidner  (klaus@snarc)

     * voclib.c: added check for ERROR in voice_wait_for(), should fix hangs

Sun May  1 22:49:12 1994  Klaus Weidner  (klaus@snarc)

     * voclib.c: removed ZyXEL rom release specific code

     * zplay.c: use mg_init_voice

     * vmodem.c:
     use voice_command instead of mi_command, ZYXEL_ROM specific init

     * Makefile:
     use ZYXEL_ROM, added vg_call.in, ChangeLog and vmodem.c to archive

     * pvfadpcm.c: added new leakage code for 6.12

Sun May  1 22:14:54 1994  Klaus Weidner  (klaus@snarc)

     * vgetty.c: integrated voice features into the state machine

     * voclib.c: cleaned up the return codes, 'E' instead of ERROR

     * zplay.c: added missing ':'s in the getopt line
     'E' returned instead of ERROR
     cleaned up the result printing on stdout

     * voclib.h: updated prototypes for voice_button and voice_answer

     * vg_call.in: add logging, removed debug functions, bugfixes

     * vanswer.c: updated get_answer_mode to avoid multiple file reads
     removed -c from /bin/sh calls
     fork the external call program, this way fax/data will work
     new functions enter_data_mode(), voice_button(), log_call_length()
     cleaned up voice_answer, the code should be much more readable now

     * Makefile: added vg_call.in, new REL

     * vg_call.in, vmodem.c: Initial revision

     * zplay.c: replaced setenv with putenv, added missing arg to -V

     * vgetty.c: gert's newest version

Thu Apr 28 12:51:19 1994  Klaus Weidner  (klaus@snarc)

     * zplay.c: security patches to make Chris Lewis happy

     * vanswer.c, voclib.c: don't put dtmf digits into the log file

     * Makefile: changed .code to 660

Wed Apr 27 17:29:36 1994  Klaus Weidner  (klaus@snarc)

     * listen.in: should work now...

     * Makefile: added PHONE_GROUP and PHONE_PERM

     * listen.in, play_messages.in: added eval "exec zplay ..." mechanism

     * zplay.c: setenv ZPLAY_X set when -X is used

     * voclib.c: don't treat interrupt as an error

     * listen.in: Initial revision

Mon Apr 25 07:40:14 1994  Klaus Weidner  (klaus@snarc)

     * Makefile: added ../sedscript dependency

Sun Apr 24 23:02:11 1994  Klaus Weidner  (klaus@snarc)

     * vg_button.in, vg_dtmf.in, vg_message.in, vg_nmp.in, vg_say.in:
     used the sedscript path handling

     * play_messages.in: Initial revision

     * zplay.1: updated shell script section

     * vgetty.c: integrated gert's changes

Fri Apr 22 21:57:32 1994  Klaus Weidner  (klaus@snarc)

     * pvfsine.c: Initial revision

     * zplay.c: updated logging code

     * voclib.c: use FAX_COMMAND_DELAY instead of hardcoded 10 ms

     * Makefile: added pvfsine and play_messages

     * zplay.c: added -X option to call a shell with the modem on stdin

Fri Apr 22 21:00:14 1994  Klaus Weidner  (klaus@snarc)

     * vg_message: added MIME support for forwarding voice messages

Fri Apr 22 20:07:38 1994  Klaus Weidner  (klaus@snarc)

     * pvfvoc.c: added rate argument

     * pvfmain.c: added pvfsine

     * voclib.h: made silence removal and the button program optional,
       added VOICE_ALWAYS_KEEP_MESSAGE

     * voclib.c: made silence removal optional

     * vanswer.c: removed redundant #includes,
       don't remove messages by default when DTMF digits are detected,
       made the button program optional

     * vgetty.c: integrated Gert's changes

Tue Mar 29 15:17:18 1994  Klaus Weidner  (klaus@snarc)

     * voice/pvfutil.c: do averaging when decreasing the sample rate

Sun Mar 20 12:26:35 1994  Klaus Weidner  (klaus@snarc)

     * voice/README: email address
