[asterisk-users] fast SIP failover (outgoing sIP requests) wi th 1.2

[Klaus Darilion]

Guido Hecken wrote:
>> -----Ursprüngliche Nachricht-----
>> Von: Klaus Darilion [mailto:klaus.mailinglists at pernau.at]
>> Gesendet: Dienstag, 19. September 2006 16:03
>> An: asterisk-users at lists.digium.com
>> Betreff: [asterisk-users] fast SIP failover (outgoing sIP requests) with
> 1.2
>> Hi!
>>
>> I have the following problem: I route calls from one office to the other
>> office via SIP, but if for any reason this SIP call fails, I want a
>> backup route via the PSTN.
>>
>> Thus, I use:
>>
>>
>> exten =>  _[1-9].,4,Dial(SIP/${enumresult},90)
>> exten =>  _[1-9].,5,GotoIf($["${DIALSTATUS}" = "CHANUNAVAIL"]?103:6)
>> exten =>  _[1-9].,6,GotoIf($["${DIALSTATUS}" = "CONGESTION"]?103:7)
>> exten =>  _[1-9].,7,Hangup
>> exten =>  _[1-9].,103,Dial(ZAP/g1/${EXTEN},90)
>>
>> The problem is, if the SIP server at the remote office is down, thus no
>> responses to the INVITE, it takes 64 seconds to timeout.
>>
>> Is there a method to shorten this interval - e.g. if there is no
>> response within 10 seconds give up - without changing the hardcoded
>> retransmission value (6) in chan_sip ?
>>
>> regards
>> klaus
> 
> Hi,
> 
> maybe I'm wrong, but what about using the ChanisAvail function?
> 
> We did something like this in a customer installation:
> 
> exten => _XXX.,1,Set(LANGUAGE()=de)
> exten => _XXX.,2,ChanisAvail(CAPI/ISDN3/${EXTEN},s)
> exten => _XXX.,3,Dial(CAPI/ISDN3/${EXTEN}/b,60,tT)
> exten => _XXX.,4,Congestion
> exten => _XXX.,103,ChanisAvail(CAPI/ISDN2/${EXTEN},s)
> exten => _XXX.,104,Dial(CAPI/ISDN2/${EXTEN}/b,60,tT)
> exten => _XXX.,105,Congestion
> 
> 
> Hope, it helps ...
> 

Hi!

I've tried it but apparently chanisavail does not work with "non-local" 
SIP peers.

thanks
klaus