Indeed... there's a specific ISDN clearing cause for it - 34 "no circuit/channel available" (NORMAL_CIRCUIT_CONGESTION). That maps to SIP 503 Service Unavailable (RFC3398).

Unallocated number implies it's not allocated anywhere and therefore shouldn't reroute, while 503 suggests you should try another route.

-Steve



On 26 April 2011 09:35, David Ponzone <david.ponzone@ipeva.fr> wrote:
Charles,

if you may, I would recommend you change the behaviour of this GW sending back a 404 when it's full...
That's odd.
It should rather use: 503 Service unavailable.

David Ponzone  Direction Technique
tel:      01 74 03 18 97
gsm:   06 66 98 76 34

Service Client IPeva
tel:      0811 46 26 26

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Le 21/04/2011 à 04:45, fieldpeak a écrit :

Thanks All, it is resolved now with below config.

2011/4/20, Kristian Kielhofner <kris@kriskinc.com>:
Try this:

<extension name="9_GW" >
 <condition field="destination_number" expression="^(9\d+)$">
   <action application="set" data="continue_on_fail=true"/>
   <action application="set" data="failure_causes=UNALLOCATED_NUMBER"/>
   <action application="set" data="hangup_after_bridge=true"/>
   <action application="bridge" data="sofia/internal/$1@192.168.200.201"/>
   <action application="bridge" data="sofia/internal/$1@192.168.200.202"/>
</condition>
</extension>

On Wed, Apr 20, 2011 at 10:58 AM, fieldpeak <fieldpeak@gmail.com> wrote:
Hi Steve,

Thanks for your so rich stuff provided.

however, i tried to use error code to route as below, it failed (did
not route the next GW when recevied UNALLOCATED_NUMBER), can you
please point out is there any place wrong in the dailplan? attached is
the log, thanks.

<extension name="9_GW" >

 <condition field="destination_number" expression="^(9\d+)$">
    <action application="set" data="continue_on_fail=true"/>
   <action application="set" data="hangup_after_bridge=false"/>
    <action application="bridge"
data="sofia/internal/$1@192.168.200.201"/>
</condition>

 <condition field="brige_hangup_cause" expression="UNALLOCATED_NUMBER">
  <action application="bridge" data="sofia/internal/$1@192.168.200.202"/>
 </condition>

</extension>

Regards,
Charles

2011/4/20, Steven Ayre <steveayre@gmail.com>:
If you know the number of calls the GW can handle in advance, you can
limit
the call attempts before sending the call to the gateway:
http://wiki.freeswitch.org/wiki/Limit
There are several ways to use that.

You can reroute calls to a 2nd gateway on error:
http://wiki.freeswitch.org/wiki/Misc._Dialplan_Tools_bridge#Implementing_Failover

There are channel variables that let you control what to consider a
reroutable error and what is a give-up error:
http://wiki.freeswitch.org/wiki/Channel_Variables#continue_on_fail
http://wiki.freeswitch.org/wiki/Channel_Variables#failure_causes
This might also be useful, particularly with mod_limit:
http://wiki.freeswitch.org/wiki/Channel_Variables#transfer_on_fail

You could use mod_lcr to get a list of all the GWs, but in a random
order.
That'd let you load balance (randomly) but reroute when required without
duplicates unlike mod_distributor.

Hopefully that's enough building blocks to give you somewhere to start...

-Steve



On 20 April 2011 08:27, Charles <fieldpeak@gmail.com> wrote:


i have two media GWs connected with FS for PSTN calls, FS route the
first
one in normal case, once the first GW get full (all of channels were
occupied), i need FS route to the second GW.
i found once the first GW get full, it will reply '404 not found' to FS,
can FS route to the second one according to this condition or any other
alternative?

although i know there is mod_distributor for load balancing, however, i
need if only first one full then route to second one, so it looks this
module not suitable for this senario...

Thanks.

Regards,
Charles

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--
Kristian Kielhofner

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