[Serusers] "3xx Redirection" - How Should This Work?

[Steve Blair]

Java Rockx wrote:

>Thanks Steve.
>
>The only reason I was using 3xx responses was because I believed that
>was the correct way to handle call forwarding.
>
>The downside of just relaying the message after rewriting the
>hostname/port is that validation must be done on the forwarded
>destination.
>
>For example, if a SIP subscriber __does not__ have the free-pstn ACL
>and they forward to a PSTN number, they could circumvent the ACL and
>make PSTN calls by dialing their own number.
>
>  
>
Ok. In my case the failure_route doing the 302 handling is only hit for 
voicemail.

>sl_send_reply("302", "Redirect") causes a whole new INVITE to be
>processed in the normal fashion.
>
>I suppose if there is no way to failover to voicemail then I'll have
>to validate forwarded numbers.
>
>Another problem with sending out an INVITE is realized when dealing
>with PSTN gateways. A nasty situation creeps up when a SIP phone is
>forwared to a PSTN destination. Then when an incoming call from some
>other PSTN phone to the SIP phone occurs, SER would try to send an
>INVITE back out the PSTN to the forwarded destination and many PSTN
>gateways will reply with "482 Loop Detected".
>
>Regards,
>Paul
>
>
>On Mon, 28 Feb 2005 11:29:37 -0500, Steve Blair <blairs at isc.upenn.edu> wrote:
>  
>
>>Why wouldn't you just rewrite the hostname and port to be that of the
>>voicemail server in your "302 failure route handling logic" and relay the
>>call?
>>
>>Java Rockx wrote:
>>
>>    
>>
>>>Hi all.
>>>
>>>I'm trying to get my call working working and I have a question.
>>>
>>>Suppose a SIP subscriber has voicemail and call forwarding is enabled.
>>>
>>>When an incoming call is destined for this SIP user, SER will reply
>>>with a 302 redirect message.
>>>
>>>Next the caller's phone should construct a brand new INVITE to the
>>>redirected destination.
>>>
>>>My question is this:
>>>
>>>If the forwarded destination is busy, then the call should be sent to
>>>the voicemail of the SIP subscriber that was originally called. This
>>>is the way the RBOCs call forwarding works.
>>>
>>>If I'm using sl_send_reply("302", "Temporarily Moved") back to the
>>>caller, how can I make the voicemail piece work?
>>>
>>>Regards,
>>>Paul
>>>
>>>_______________________________________________
>>>Serusers mailing list
>>>serusers at lists.iptel.org
>>>http://lists.iptel.org/mailman/listinfo/serusers
>>>
>>>
>>>      
>>>
>>--
>>
>>ISC Network Engineering
>>The University of Pennsylvania
>>3401 Walnut Street, Suite 221A
>>Philadelphia, PA 19104
>>
>>voice: 215-573-8396
>>
>>       215-746-8001
>>
>>fax: 215-898-9348
>>
>>sip:blairs at upenn.edu
>>
>>
>>    
>>

-- 
  
ISC Network Engineering
The University of Pennsylvania
3401 Walnut Street, Suite 221A
Philadelphia, PA 19104  


voice: 215-573-8396 

       215-746-8001

fax: 215-898-9348    

sip:blairs at upenn.edu