[Freeswitch-users] Dropping the Subject: header

Thu Dec 23 20:25:42 MSK 2010

Ah, you're quite right... sorry, I locked onto you saying that you
were setting it for a custom app and assumed you were trying to do
something outside of the specification.

Looking at the source code, it looks like FreeSWITCH doesn't currently
provide any way to use that field on an INVITE from mod_sofia... if
you wanted it you'd have to open a Jira ticket.

http://jira.freeswitch.org/

Regards,
-Steve

On 23 December 2010 16:46, Kane, Michael (mkane02) <mkane02 at harris.com> wrote:
> Hey Steve, I was under the impression Subject header wasn't a custom header.  We're using Media5's stack and it's readily available in their library and is defined in 3261.
>
> Mike
>
> -----Original Message-----
> From: freeswitch-users-bounces at lists.freeswitch.org [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Steven Ayre
> Sent: Thursday, December 23, 2010 10:46 AM
> To: FreeSWITCH Users Help
> Subject: Re: [Freeswitch-users] Dropping the Subject: header
>
> http://www.rfc-editor.org/rfc/rfc3427.txt
> The RFC recognises X- has been used in other protocols (eg SMTP) and
> says prefix P- should be used for SIP. In practice both P- and X- are
> used.
>
> The reason is that if you are setting a custom header, it avoids
> conflicts if they revise the SIP specification in future (eg for
> SIPv3) and add a header with the same name as yours but a different
> purpose.
>
> See also:
> http://blogs.voxeo.com/speakingofstandards/2008/05/06/what-is-a-p-header-in-sip-and-whyhow-would-you-use-one/
> http://www.the-asterisk-book.com/unstable/applikationen-sipaddheader.html
>
> Note that the X-header functionality is specifically coded within the
> Sofia-SIP library:
> http://sofia-sip.sourceforge.net/refdocs/sip/group__sip__header__x.html
> To handle custom headers not prefixed with X- or P- would involve
> considerable rewriting of the library to expose the ability. Since the
> library is written by Nokia that would result in a large difference
> between the FS and upstream versions, making it hard to maintain.
>
> Regards,
> Steve
>
>
> On 23 December 2010 13:46, Kane, Michael (mkane02) <mkane02 at harris.com> wrote:
>> Hey Steve/David, I'm a bit confused about having to add the X- prefix to the Subject header.  Can you please point me in the direction of which RFC talks to experimental headers?
>>
>> Thanks Mike
>>
>> Ps...thanks for looking into this for me.
>>
>> -----Original Message-----
>> From: freeswitch-users-bounces at lists.freeswitch.org [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Steven Ayre
>> Sent: Wednesday, December 22, 2010 5:04 PM
>> To: FreeSWITCH Users Help
>> Subject: Re: [Freeswitch-users] Dropping the Subject: header
>>
>> David,
>>
>> Change your custom app to use X-Subject not Subject (AFAIK the RFC
>> says any custom headers should be prefixed X-). My previous example
>> will then work if you export sip_h_X-Subject.
>>
>> -Steve
>>
>>
>> On 22 December 2010 19:40, Kane, Michael (mkane02) <mkane02 at harris.com> wrote:
>>> Thanks David, I really appreciate your clarification.
>>>
>>>
>>>
>>>
>>>
>>> Brian, please contact me regarding how we can get a patch incorporated into
>>> FS to pass the Subject header.
>>>
>>>
>>>
>>> Thanks Mike
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> From: freeswitch-users-bounces at lists.freeswitch.org
>>> [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of David
>>> Ponzone
>>> Sent: Wednesday, December 22, 2010 2:31 PM
>>>
>>> To: FreeSWITCH Users Help
>>> Subject: Re: [Freeswitch-users] Dropping the Subject: header
>>>
>>>
>>>
>>> Michael,
>>>
>>>
>>>
>>> what Brian meant is that FreeSWICH can only passes the X-something and
>>> P-something headers, which are the only allowed ones.
>>>
>>> Any system requiring custom headers should implement:
>>>
>>> X-Subject
>>>
>>> and not
>>>
>>> Subject
>>>
>>>
>>>
>>>
>>>
>>> David Ponzone  Direction Technique
>>>
>>> email: david.ponzone at ipeva.fr
>>>
>>> tel:      01 74 03 18 97
>>>
>>> gsm:   06 66 98 76 34
>>>
>>>
>>>
>>> Service Client IPeva
>>>
>>> tel:      0811 46 26 26
>>>
>>> www.ipeva.fr  -   www.ipeva-studio.com
>>>
>>>
>>>
>>> Ce message et toutes les pièces jointes sont confidentiels et établis à
>>> l'intention exclusive de ses destinataires. Toute utilisation ou diffusion
>>> non autorisée est interdite. Tout message électronique est susceptible
>>> d'altération. IPeva décline toute responsabilité au titre de ce message s'il
>>> a été altéré, déformé ou falsifié. Si vous n'êtes pas destinataire de ce
>>> message, merci de le détruire immédiatement et d'avertir l'expéditeur.
>>>
>>>
>>>
>>>
>>>
>>> Le 22/12/2010 à 20:09, Kane, Michael (mkane02) a écrit :
>>>
>>> We have a custom app that requires the Subject header with values so our
>>> endpoints can route the audio accordingly.  I'm ok with using sip_h_X
>>> and or sip_h_P, but can't seem to get FS to pass the Subject header.
>>> Any direction would be greatly appreciated.
>>>
>>> Mike
>>>
>>> -----Original Message-----
>>> From: freeswitch-users-bounces at lists.freeswitch.org
>>> [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of
>>> Brian West
>>> Sent: Wednesday, December 22, 2010 1:58 PM
>>> To: FreeSWITCH Users Help
>>> Subject: Re: [Freeswitch-users] Dropping the Subject: header
>>>
>>> What is the sudden obsession with the subject header?  Looking thru the
>>> code it appears as if sip_h_X and sip_h_P are the only two things that
>>> you can do... a patch will have to be made if you wish to set the
>>> subject on an outbound invite... see sofia_glue.c  in do_invite.
>>>
>>> /b
>>>
>>> On Dec 22, 2010, at 12:50 PM, Kane, Michael (mkane02) wrote:
>>>
>>>
>>> Hey Steve, the Subject is still not regenerated through the switch.  I
>>>
>>> posted a new pastbin.
>>>
>>>
>>>
>>> 14858
>>>
>>>
>>>
>>> Mike
>>>
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>>
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