modem, login, phone problems

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we are running mgetty 1.1.16, cyclades board with the latest driver, and
linux kernel 2.0.29, and using USR Sporster 33.6 modems.

we are having problems where the modems will not answer the the incoming
calls at all, then for no reason they will answer. this is happening
mainly on 1 set of 4 lines.

One other problems is that users are being disconnected for now reason at
all, just out of the blue they get kicked off.

this is from the mgetty.ttyC1 log file:

------- cut --------
07/26 14:20:00 yC1  checking if modem is still alive
07/26 14:20:00 yC1  mdm_send: 'AT' -> OK
07/26 14:20:00 yC1  waiting...
07/26 15:20:00 yC1  checking if modem is still alive
07/26 15:20:00 yC1  mdm_send: 'AT'
07/26 15:20:10 yC1  Warning: got alarm signal!
07/26 15:20:10 yC1  mdm_read_byte: read returned -1: Interrupted system
call
07/26 15:20:10 yC1  mdm_get_line: cannot read byte, return: Interrupted
system call -> ERROR
07/26 15:20:10 yC1  mdm_send: 'AT'
07/26 15:20:20 yC1  Warning: got alarm signal!
07/26 15:20:20 yC1  mdm_read_byte: read returned -1: Interrupted system
call
07/26 15:20:20 yC1  mdm_get_line: cannot read byte, return: Interrupted
system call -> ERROR
07/26 15:20:20 yC1  modem on dev=ttyC1 doesn't react!: Interrupted system
call
--
07/26 15:20:21 yC1  mgetty: experimental test release 1.1.16-Jul05
07/26 15:20:21 yC1  check for lockfiles
07/26 15:20:21 yC1  locking the line
07/26 15:20:21 yC1  WARNING: DSR is off - modem turned off or bad cable?
07/26 15:20:21 yC1  lowering DTR to reset Modem
07/26 15:20:22 yC1  WARNING: obsolete setserial spd_hi/spd_vhi used, 38400
is not real port speed
07/26 15:20:22 yC1  send: AT&F&H1&R2&B1S0=0&K1&M4&S1S2=43[0d]
07/26 15:20:22 yC1  waiting for ``OK'' ** found **
07/26 15:20:22 yC1  waiting...
07/26 16:09:23 yC1  wfr: waiting for ``RING''
07/26 16:09:23 yC1  send: ATA[0d]
07/26 16:09:23 yC1  waiting for ``CONNECT'' ** found **
------- cut --------

This is from an old messages log file:

------ cut --------
Mar 29 13:00:06 homer pppd[164]: LCP terminated by peer
Mar 29 13:00:06 homer pppd[164]: Modem hangup
Mar 29 13:00:06 homer pppd[164]: Connection terminated.
Mar 29 13:00:06 homer pppd[164]: Hangup (SIGHUP)
Mar 29 13:00:06 homer pppd[164]: Exit.
-------- cut -------

this is from todays messages log

-------- cut ------
Jul 31 14:35:23 homer pppd[27179]: LCP terminated by peer
Jul 31 14:35:23 homer pppd[27179]: Modem hangup
Jul 31 14:35:23 homer pppd[27179]: Connection terminated.
Jul 31 14:35:23 homer pppd[27179]: Hangup (SIGHUP)
Jul 31 14:35:23 homer pppd[27179]: Exit.
------- cut -------

then we have some like this 

-------- cut --------
Jul 31 14:40:11 homer pppd[27107]: Hangup (SIGHUP)
Jul 31 14:40:11 homer pppd[27107]: Modem hangup
Jul 31 14:40:11 homer pppd[27107]: Connection terminated.
Jul 31 14:40:11 homer pppd[27107]: Modem hangup
Jul 31 14:40:11 homer pppd[27107]: Connection terminated.
Jul 31 14:40:11 homer pppd[27107]: Exit.
--------- cut -------

why the differnce in the log entries and does have an effect as to why the
are cut off???

thanks for the time.