[reSIProcate] [reSIProcate-users] Expires field in INVITE request

[Rohan Mahy]

Hi Byron,

I think use of this feature is generally a bad idea and I would push  
for it to be deprecated in a future version of the standard.  An  
application that is interested in setting this header would be better  
off setting an application-level timer and canceling the request.

If a UAS that receives this request ignores the Expires header,  
nothing bad really happens.  If the UAS sends a 2xx to the request,  
the UAC should have code to just send a BYE.

thanks,
-rohan


On Apr 24, 2008, at 7:33 AM, Byron Campen wrote:
> 	CCing to resip-devel:
>
> 	Actually, the is UAC core behavior, so this sort of thing would  
> belong down in the stack, not DUM. I actually think that this would  
> be a good thing to implement. (Of course, we'd need to make it  
> configurable so repro wouldn't act on it; forwarding an INVITE with  
> an Expires shouldn't trigger timers and such, since that's the  
> UAC's job)
>
> 	Anyone have a strong opinion on this?
>
> Best regards,
> Byron Campen
>
>
>
>> According to RFC 3261
>>    The UAC MAY add an Expires header field (Section 20.19) to  
>> limit the
>>    validity of the invitation.  If the time indicated in the Expires
>>    header field is reached and no final answer for the INVITE has  
>> been
>>    received, the UAC core SHOULD generate a CANCEL request for the
>>    INVITE, as per Section 9.
>> As I far as I know resiprocate does not  implement this behavior  
>> so I have made changes to the library. So I added one more timer -  
>> InviteExpires(see DumTimeout.hxx) that acts similar to StaleCall  
>> timer.
>> I think that modifying library is not a good idea so, is there any  
>> other way to limit call duration while it has not received final  
>> answer? If no can you give any feedback on changes I have made  
>> especially on possible incorrect interaction with existing  
>> resiprocate code. I'm using resiprocate of version 1.1
>> Thanks in advance.
>> <dum.zip>_______________________________________________
>> resiprocate-users mailing list
>> resiprocate-users at resiprocate.org
>> List Archive: http://list.resiprocate.org/archive/resiprocate-users/
>
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