[Freeswitch-users] Bug in Q921.c? AVAYA-PBX issue

[Michael Collins]

On Fri, Dec 12, 2008 at 7:01 AM, Helmut Kuper <helmut.kuper at ewetel.de> wrote:
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> Hello,
>
> I try to establish a ISDN PRI (euroisdn/Q931) link between FS and an
> AVAYA PBX. We use Sangoma A101 and FS revision 10729M on a Ubuntu 8.04
> server in a non-root environment.
>
> We experienced a timer problem which led to this FS console error message:
>
> [ERR] Span:0 Q.921() Failed to establish Q.921 link in 3 retries
>
>
> During anylizing this we found that q921 T203 is never reset when link
> is in state "Multiple Frame Mode Established" and SABME frames are
> received by FS. So it must timeout regardless if SABME frames are
> received or not.
> Additionally we found that the default T203 value (10 sec) was too short
> for AVAYA (it has to be >=19 sec)
>
> To fix the problem we changed two things in q921.c:
>
> Change T203 default value from 10 sec to 20000 sec
> Line 406: trunk->T203Timeout = 20000;
>
> Change Q921T203TimerStart to Q921T203TimerReset to reset T203 on each
> received SABME frame
> Line 1996: Q921T203TimerReset(trunk, tei);
>
> After recompiling FS the Error disapeared. Next week we will do some
> calls over the link to make sure there are no other side effects.
>
> Is it planned to make the q921 timeouts configurable in openzap.conf or
> in openzap.conf.xml?
>
> best regards
> Helmut
>
>
> PS: My openzap configs:
>
> openzap.conf
>
> [span wanpipe PRI_1]
> trunk_type => E1
> b-channel => 1:1-15
> d-channel => 1:16
> b-channel => 1:17-31
>
>
>
>
> openzap.conf.xml
>
> <configuration name="openzap.conf" description="OpenZAP Configuration">
>  <settings>
>    <param name="debug" value="7"/>
>    <!--<param name="hold-music" value="$${moh_uri}"/>-->
>    <!--<param name="enable-analog-option" value="call-swap"/>-->
>    <!--<param name="enable-analog-option" value="3-way"/>-->
>  </settings>
>   <pri_spans>
>     <span name="PRI_1">
>       <!-- Log Levels: none, alert, crit, err, warning, notice, info,
> debug -->
>       <param name="q921loglevel" value="debug"/>
>       <param name="q931loglevel" value="debug"/>
>       <param name="mode" value="user"/>
>       <param name="dialect" value="Oh this is not my dialect"/>
>       <param name="dialplan" value="XML"/>
>       <param name="context" value="default"/>
>     </span>
>   </pri_spans>
> </configuration>
>
> Very interesting here is, that the "dialect" parameter doesn't seem to
> have an effect on FS. I use that one above without any errors or warning
> and I guess that was not intended.

At this point in the OZ development we've got it set to default to
"national" if the dialect isn't otherwise properly specified. It does
make sense to throw an error if the dialect is not properly specified,
even if we still default to national.

-MC

>
>
>
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