flexfax: "Waiting for modem to come ready!" with more than two modems!!

[Dietmar Osterburg <Dietmar.Osterburg@iclsorbus.de>]

Hallo there,

I use Hylafax Version  v4.0pl2 on an Intel-machine (i386) with  SuSE Linux 6.0

I want to run Hylafax with 4 modems, but only two are actuell running !
The faxstat command tells me:   2 are running and idle!
                                                2 are toggling [waiting for modem come ready -> Initializing server -> .....]
In /etc/inittab the four entrys are available:

# fax getty (hylafax)
m1:23:respawn:/usr/lib/fax/faxgetty  /dev/ttyS0
m2:23:respawn:/usr/lib/fax/faxgetty  /dev/ttyS1
m3:23:respawn:/usr/lib/fax/faxgetty  /dev/ttyS2
m4:23:respawn:/usr/lib/fax/faxgetty  /dev/ttyS3

** Each modem runs fine when I enter ONLY two faxgetty lines  in inittab. **

Each modem has its own serial port  (Port:2f8, Int:3     Port:3f8, Int:4     Port:2e8, Int:3,      Port:3e8, Int 4 ).
Each Serial-Interrupt is shared by 2 Modems - this ( I think ) can be perhaps the problem.

LOG of /var/log/messages :
    FaxGetty[3394]: Unable to setup modem on /dev/ttyS3; giving up after 2 attempts
    FaxQueuer[1197]: MODEM /dev/ttyS3 appears to be wedged
    FaxGetty[3394]: CLOSE /dev/ttyS3
    FaxGetty[3405]: OPEN /dev/ttyS3
    FaxGetty[3405]: /dev/ttyS3: Can not initialize modem.

Have You an idea where the problem is and how  I can fix it ?
With Kind Regards , Dietmar