mgetty ringback problem

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Good day,

I've recently started using mgetty.1.1.9, and like it very much.  However,
I am having one problem right now.  Because of my office situation, I am
forced to use one phone line for both voice mail and my modem.  So, I've
tried to set up the RINGBACK feature in mgetty.  This doesn't seem to quite
work.

On the first call, mgetty doesn't pick up.  This works correctly.  However,
the second call will always be picked up, regardless of how much time I
wait between calls.  In the mgetty.config file I have the following:

ringback y
ringback-time 60
rings 1

My understanding is that if the second call arrives within 60 seconds of
the first call, then mgetty picks up.  Otherwise, mgetty resets and the
process starts over again. 

Am I doing something wrong?

Relevant information:

modem=Hayes Accura 336/56K
OS=Redhat Linux 5.0

mgetty log file:

06/22 12:20:22 yS0  mgetty: experimental test release 1.1.9-Aug17
06/22 12:20:22 yS0  check for lockfiles
06/22 12:20:22 yS0   checklock: no active process has lock, will remove
06/22 12:20:22 yS0  locking the line
06/22 12:20:22 yS0   makelock(ttyS0) called
06/22 12:20:22 yS0   do_makelock: lock='/var/lock/LCK..ttyS0'
06/22 12:20:22 yS0   lock made
06/22 12:20:23 yS0   tio_get_rs232_lines: status: RTS CTS DSR DTR
06/22 12:20:23 yS0  lowering DTR to reset Modem
06/22 12:20:23 yS0   tss: set speed to 115200 (10002)
06/22 12:20:23 yS0   tio_set_flow_control( HARD )
06/22 12:20:23 yS0   waiting for line to clear (VTIME), read: 
06/22 12:20:24 yS0  send: \dATQ0V1H0[0d]
06/22 12:20:24 yS0  waiting for ``OK''
06/22 12:20:24 yS0   got: [0d][0a]OK ** found **
06/22 12:20:24 yS0  send: ATS0=0Q0&D3&C1[0d]
06/22 12:20:24 yS0  waiting for ``OK''
06/22 12:20:24 yS0   got: [0d]
06/22 12:20:24 yS0    CND: OK[0a]ATQ0V1H0[0d]
06/22 12:20:24 yS0    CND: ATQ0V1H0[0d][0a]OK ** found **
06/22 12:20:24 yS0   waiting for line to clear (VTIME), read:
[0d][0a]ATS0=0Q0&D3&C1[0d][0d][0a]OK[0d][0a]
06/22 12:20:24 yS0   removing lock file
06/22 12:20:24 yS0  waiting...
06/22 12:24:07 yS0    select returned 1
06/22 12:24:07 yS0   checking lockfiles, locking the line
06/22 12:24:07 yS0   makelock(ttyS0) called
06/22 12:24:07 yS0   do_makelock: lock='/var/lock/LCK..ttyS0'
06/22 12:24:07 yS0   lock made
06/22 12:24:07 yS0  waiting for ``RING''
06/22 12:24:07 yS0   got: [0d]
06/22 12:24:07 yS0    CND: OK[0a]RING ** found **
06/22 12:24:07 yS0  waiting for ``RING''
06/22 12:24:07 yS0   got: [0d]
06/22 12:24:07 yS0    CND: RING[0a]
06/22 12:25:44 yS0  timeout in chat script, waiting for `RING'
06/22 12:25:44 yS0  ringback: phone stopped after 1 RINGs, waiting for re-ring
06/22 12:25:44 yS0  waiting for ``RING''
06/22 12:25:44 yS0   got: [0a]RING ** found **
06/22 12:25:44 yS0  send: ATA[0d]
06/22 12:25:44 yS0  waiting for ``CONNECT''
06/22 12:25:44 yS0   got: [0d]
06/22 12:25:44 yS0    CND: RING[0a]ATA[0d]
06/22 12:25:44 yS0    CND: ATA[0d][0a]CONNECT ** found **
06/22 12:25:58 yS0  send: 
06/22 12:25:58 yS0  waiting for ``_''
06/22 12:25:58 yS0   got:  19200 V42bis[0d]
06/22 12:25:58 yS0    CND: CONNECT 19200 V42bis
06/22 12:25:58 yS0    CND: found: 19200 V42bis[0a] ** found **

06/22 12:25:58 yS0   waiting for line to clear (VTIME), read: 
06/22 12:25:58 yS0    looking for utmp entry... (my PID: 4520)
06/22 12:25:58 yS0   utmp + wtmp entry made
06/22 12:25:59 yS0   tio_set_flow_control( HARD )
06/22 12:25:59 yS0   print welcome banner (/etc/issue)
06/22 12:25:59 yS0   getlogname (AUTO_PPP), read:srp[0d]
06/22 12:26:02 yS0   input finished with '\r', setting ICRNL ONLCR
06/22 12:26:02 yS0   tio_get_rs232_lines: status: RTS CTS DSR DTR DCD
06/22 12:26:02 yS0    login: use login config file
/etc/mgetty+sendfax/login.config
06/22 12:26:02 yS0   match: user='srp', key=''
06/22 12:26:02 yS0   match: user='srp', key='/FIDO/'
06/22 12:26:02 yS0   match: user='srp', key=''
06/22 12:26:02 yS0   match: user='srp', key=''
06/22 12:26:02 yS0   match: user='srp', key='*'*** hit!
06/22 12:26:02 yS0   calling login: cmd='/bin/login', argv[]='login srp'
06/22 12:26:02 ##### data dev=ttyS0, pid=4520, caller=none, conn='19200
V42bis', name='', cmd='/bin/login', user='srp'
06/22 12:26:02 yS0   setenv: 'CALLER_ID=none'
06/22 12:26:02 yS0   setenv: 'CONNECT=19200 V42bis'


-----------------------------------------------------
Stephen R. Platt
Polar Ice Coring Office
Snow & Ice Research Group
University of Nebraska-Lincoln
2255 W Street, Suite 101
Lincoln, NE 68583-0850

Tel: 402-472-9868
FAX: 402-472-9832
email: srp@unl.edu