Hello Greger
I am surprised that you argue that 302s is not the standard call forward scenario when this is how it is implemented in almost all sip equipment (havent seen any device who does it differently). Customer will punch in cfwd (like *72<number>) in their phone and expect the operator (me) to forward the call to the destination at their expense. This is nothing new or strange. 302s signal that an UA has temporarily been moved and can be reached somewhere else, how is that not call forwarding? Also, I would never expect an UA to send back an email address in an IP telephony system, even if it is theoretically possible. I would expect it to send back a SIP address; everything else is not reachable through the protocol of SIP and makes absolutely no sense.
Most Voip customers are not techies and they are not rfc knowledgeable and could not care any less about how the forwarding is made. They would not be upset that their 302 generate a cost, this is the expected behaviour for this service.
Kind regards
Roger
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Från: serusers-bounces@lists.iptel.org [mailto:serusers-bounces@lists.iptel.org] För Greger V. Teigre Skickat: den 11 september 2006 11:59 Till: Roger Lewau Kopia: serusers@iptel.org; jh@tutpro.com Ämne: Re: [Serusers] Handling 302 responses
Hi Roger, I think that was Juha's point: we don't. 302 was created to enable a user agent to communicate back to the other user agent that it can be reached somewhere else. Thus, your server should relay the 302 and the receiving user agent should then decide what to do. Some UAs immediate initiate a new call, while others (e.g.software agents) may pop up a question to the user: "Callee is not available, but can be reached at location" (which of course may well be an international PSTN call that can be expensive). Some UAs also have options that can be set: How to handle redirects
Server-centric forwarding can be better handled by user preferences and loading av pairs.
That being said, I remember a thread a while ago with a discussion on how to turn a 302 into a forwarding. I don't remember the outcome, but it is probably possible, although not according to the RFCs. You do have some problems though, e.g. if the UA sends back an email uri etc.
And of course, as people tend to follow RFCs, you will probably get one angry customer if he realizes that his 302 generates a cost. If you have control over the UA and have decided to use 302 instead of the more standardized call forward scenario, you really are making problems for yourself. g-)
Roger Lewau wrote:
Hello Juha and Andrey
302 "Moved temporarily" is definately about forwarding/redirecting calls. This is how the vast majority of all IP phones and ATAs handle call forwarding. It might not be the intended use of 302 according to RFCs, even if I see nothing that says otherwise, but this is how it is used in end devices today. This brings us back to my original question. How do you guys handle 302 redirection so that costs are charged to the callee.
Kind regards
Roger
-----Original Message----- From: "Andrey Kouprianov" mailto:andrey.kouprianov@gmail.com andrey.kouprianov@gmail.com To: serusers@iptel.org Date: Mon, 11 Sep 2006 12:51:09 +0700 Subject: Re: [Serusers] Handling 302 responses
You can also use 302 responses to gather some information about the remote party. Contacts returned in the response are not necessarily the SIP URI's. I've tried using mail addresses, SIP tel: URI's and HTTP URLs too.
So, if the remote party is Busy at the moment, but has other ways to let u contact them, 302 is one of the answers to this.
On 9/11/06, Juha Heinanen mailto:jh@tutpro.com jh@tutpro.com wrote:
Roger Lewau writes:
In my mind that statement is completely off the wall, it is not the requesting client that should be responsible for establishing the
forwarded
call, it never is in the rest of the telecom industry so why should it
be
the case for SIP?
302 is not about "forwarded call". it just tells the caller that the callee is at some other uri, which the caller may or may not wish to contact. in many pstn networks, you can hear an announcement that the number you tried is not in use and you should try another number instead.
if callee wants to "forward" calls, he has other means for that purpose, for example, his phone can forward the invite to some other uri or he may configure his proxy to do so.
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