[Bugme-new] [Bug 10688] New: ISDN outgoing calls often fails when used on satellite systems

bugme-daemon at bugzilla.kernel.org bugme-daemon at bugzilla.kernel.org
Tue May 13 04:31:31 PDT 2008


http://bugzilla.kernel.org/show_bug.cgi?id=10688

           Summary: ISDN outgoing calls often fails when used on satellite
                    systems
           Product: Drivers
           Version: 2.5
     KernelVersion: 2.6.18.8
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: ISDN
        AssignedTo: drivers_isdn at kernel-bugs.osdl.org
        ReportedBy: francois at goudal.net
                CC: francois at goudal.net


Latest working kernel version: none, as far as I know
Distribution: Debian 3.1
Hardware Environment: x86 machine + AVM Fritz! PCMCIA ISDN adapters
Problem Description:
When used on a satellite system, the I4L stack often fails to establish
outgoing calls. This is due to timeouts in the I4L code that are more easily
triggered because of the latency introduced by the satellite link. On an
inmarsat system, I have faced more than 50% of failures, which is not really
acceptable.

Steps to reproduce:
Buy an Inmarsat satcom system ;-) (Thrane M4, for example)
Connect your AVM Fritz ISDN card to it
Install the I4L driver (You probably prefer CAPI but you don't want the
proprietary drivers from AVM so you don't have much choice)
Try to make linux dial a phone/dialup server on the ground using the satcom
system.
Repeat the dialout several times, some of the attempts are probably going to
fail.


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