[Freeswitch-users] how to handle returned sip 302 dialplan

[Chav Paskov]

Shelby Ramsey wrote:
> Chav,
>
> We recently / are still going through the same process (in order to 
> route on LRN) vs NPANXX or LATA based routing.  Here was the best way 
> that we came up with to do it:
>   -- we use xml_curl exclusively for routing decisions
>   -- so in the cgi script that xml_curl hits one of the things it can 
> (and does based on certain parameters) is fire off a url to another 
> LNP server that we built
>   -- the LNP server actually does the dip (either from a cache) and 
> returns the info
>
> We felt this was much better for a few reasons:
>   -- caching the LNP data for a 24 hour period would save us in excess 
> of $100k a year
>   -- having a specialized mechanism to do this was much easier to 
> implement for the cgi process than supporting 302 redirects directly 
> on the FS boxes was much easier (which just wasn't possible with the 
> cgi mechanism)
>   -- every LNP provider returns 302's slightly different ... so we 
> didn't want to have to reinvent the wheel on the FS machines if we 
> ever wanted to add redundancy or switch providers
>
> Guess it all depends on your config ... but this was the easiest and 
> most cost-effective means for us to implement.
>
>
> On Sat, Dec 13, 2008 at 6:38 PM, Chav Paskov <chavpaskov at shaw.ca 
> <mailto:chavpaskov at shaw.ca>> wrote:
>
>     Brian West wrote:
>     > Chav,
>     > Once the 302 is received by FreeSWITCH it will follow it to the
>     > contact listed in the 302.  What else are you needing to do?
>     >
>     > /b
>     >
>     > On Dec 13, 2008, at 2:24 PM, Chav Paskov wrote:
>     >
>     >> *User-Agent: eXosip/3.1.0^M
>     >> Content-Length:
>     >>
>     >>
>     >> my question is:
>     >>
>     >> Is it possible to send the call to z.z.z.z , receive the SIP 302 ,
>     >> process the data in Contact field  and redirect to the new
>     destination
>     >> contained in *Contact: <sip:2145551234 at 64.112.188.84
>     <mailto:sip%3A2145551234 at 64.112.188.84>>;npdi^M
>     >> *without closing the session.
>     >> i red something about   <action application="set"
>     >> data="continue_on_fail=true"/>  but i'm not sure  how to use it.
>     >>
>     >> Any ideas on this matter  will be highly appreciated.
>     >> Best Regards
>     >> Chav
>     >>
>     >
>     >
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>     >
>     Thanks Brian,
>
>     probably i should have explained it in more details.
>     this whole thing started as an attempt to  implement lata ocn /local
>     number portability/ instead of  pure per destination routing.
>     At the moment i have a access to  a service provider  who does
>     "dipping"  and returns  the  LATA OCN  data associated with  any
>     dialed
>     destination number. it is returned as Contact:  and Content-length:
>     fields in 302 message.
>
>     in other words:
>
>     1. i'm sending to this provider let say - 2025556666  as a destination
>     number.
>     2. they do the dipping  and will return to me  either the new dest
>     #  if
>     2025556666 has been ported or if it was not
>     in content-length field they'll send  lata, ocn  and state and 10
>     digits
>     number.
>     3. once received i have to  compare the received lata , ocn and state
>     date with  a compiled  rate deck / blended from 5 different vendors/
>     and pick the lowest rate - effectively building  LCR based on LATA OCN
>     STATE info.
>
>     Hope this will help to clear the picture.
>     Regards
>     Chav
>
>
>
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>   
thanks for the prompt response.
Can you pls  give me an example how to access the info  contained in  
Contact:  and content-legth: fields  if you can.
I was thinking  in going the exactly same direction  in terms of 
building  xml_curl  dialplan  but i'm lacking knowledge
on how to access variables.
Regards
Chav