cnd-program doesn't work

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Mgetty hangs up to phone and is not executing the cnd-program.

here's my mgetty.config:
debug 9

toggle-dtr yes
toggle-dtr-waittime 500

modem-type auto
autobauding no
rings 10

fax-id 517-347-0152
fax-owner root
fax-group fax
fax-mode 640

port ttyS1
    speed 57600
    cnd-program /usr/local/sbin/incoming-call
    get-cnd-chat "" AT\\O OK
    init-chat "" \d\d\d+++\d\d\dATH0 OK
----

and here's my log file:
11/23 08:00:43 yS1   waiting for line to clear (VTIME), read:
11/23 08:00:44 yS1   removing lock file
11/23 08:00:44 yS1  waiting...
11/23 09:00:43 yS1    select returned 0
11/23 09:00:43 yS1  checking if modem is still alive
11/23 09:00:43 yS1   makelock(ttyS1) called
11/23 09:00:43 yS1   do_makelock: lock='/var/lock/LCK..ttyS1'
11/23 09:00:43 yS1   lock made
11/23 09:00:43 yS1  mdm_send: 'AT'
11/23 09:00:43 yS1    got:AT[0d]
11/23 09:00:43 yS1   mdm_command: string 'AT'
11/23 09:00:43 yS1    got:[0d][0a]OK[0d]
11/23 09:00:43 yS1   mdm_command: string 'OK' -> OK
11/23 09:00:43 yS1   waiting for line to clear (VTIME), read:
11/23 09:00:43 yS1   removing lock file
11/23 09:00:43 yS1  w11/23 10:00:42 yS1    select returned 0
11/23 10:00:42 yS1  checking if modem is still alive
11/23 10:00:42 yS1   makelock(ttyS1) called
11/23 10:00:42 yS1   do_makelock: lock='/var/lock/LCK..ttyS1'
11/23 10:00:42 yS1   lock made
11/23 10:00:42 yS1  mdm_send: 'AT'
11/23 10:00:42 yS1    got:[0a]AT[0d]
11/23 10:00:42 yS1   mdm_command: string 'AT'
11/23 10:00:42 yS1    got:[0d][0a]OK[0d]
11/23 10:00:42 yS1   mdm_command: string 'OK' -> OK
11/23 10:00:42 yS1   waiting for line to clear (VTIME), read:
11/23 10:00:43 yS1   removing lock file
11/23 10:00:43 yS1  w11/23 11:00:42 yS1    select returned 0
11/23 11:00:42 yS1  checking if modem is still alive
11/23 11:00:42 yS1   makelock(ttyS1) called
11/23 11:00:42 yS1   do_makelock: lock='/var/lock/LCK..ttyS1'
11/23 11:00:42 yS1   lock made
11/23 11:00:42 yS1  mdm_send: 'AT'
11/23 11:00:42 yS1    got:[0a]AT[0d]
11/23 11:00:42 yS1   mdm_command: string 'AT'
11/23 11:00:42 yS1    got:[0d][0a]OK[0d]
11/23 11:00:42 yS1   mdm_command: string 'OK' -> OK
11/23 11:00:42 yS1   waiting for line to clear (VTIME), read:
11/23 11:00:42 yS1   removing lock file
11/23 11:00:42 yS1  waiting...
11/23 11:33:12 yS1    select returned 1
11/23 11:33:12 yS1   checking lockfiles, locking the line
11/23 11:33:12 yS1   makelock(ttyS1) called
11/23 11:33:12 yS1   do_makelock: lock='/var/lock/LCK..ttyS1'
11/23 11:33:12 yS1   lock made
11/23 11:33:12 yS1  wfr: waiting for ``RING''
11/23 11:33:12 yS1   got: [0a][0d][0a]RING[0d]
11/23 11:33:12 yS1    CND: RING
11/23 11:33:12 yS1   wfr: rc=0, drn=0
11/23 11:33:12 yS1  wfr: waiting for ``RING''
11/23 11:33:12 yS1   got: [0a][0d][0a]DATE = 1123[0d]
11/23 11:33:15 yS1    CND: DATE = 1123
11/23 11:33:15 yS1    CND: found: 1123
11/23 11:33:15 yS1   got: [0a]TIME = 1134[0d]
11/23 11:33:15 yS1    CND: TIME = 1134
11/23 11:33:15 yS1    CND: found: 1134
11/23 11:33:15 yS1   got: [0a]NMBR = ##########[0d]
11/23 11:33:15 yS1    CND: NMBR = ##########
11/23 11:33:15 yS1    CND: found: ##########
11/23 11:33:15 yS1   got: [0a]NAME = CALLER[0d]
11/23 11:33:15 yS1    CND: NAME = CALLER
11/23 11:33:15 yS1    CND: found: CALLER
11/23 11:33:15 yS1   got: [0a]
---->>> I think this is where the problem is:
11/23 11:33:22 yS1  mdm_read_byte: read returned -1: Interrupted system
call
11/23 11:33:22 yS1  wfr: timeout waiting for RING
11/23 11:33:22 yS1   wfr: rc=-1, drn=0
11/23 11:33:22 ##### phone stopped ringing (rings=1)
----

the caller is hung up and the cnd-program is never executed.  What is
wrong?  I'm using mgetty 1.1.18.

Thanks
-Paul