[SIPForum-discussion] INFO method

[Peili Xu]

In my understanding, there is no strict semantic and grammatical difference
between INFO and MESSAGE when used to transmit mid-dialog information, the
content-type is the point of key.

-----Original Message-----
From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Darko Milic
Sent: Monday, September 19, 2005 3:53 AM
To: An open list for discussion of SIP-related topics
Subject: Re: [SIPForum-discussion] INFO method



Thanks to all,
I've get some idea of INFO usage. As I said my intention was to send some
additional information after SIP dialog had been opened. This information
includes some cryptographic parameters, in several rounds, before media
communication, meaningful only for upper application (Call Control) on both
side, but not for human user. I believe now that INFO is appropriate
solution  and that the MESSAGE request should be left for human user data.
Isn’t it?

 

Regards, 

Darko 



  

Beith, Gordon wrote: 

INFO method is used for various mid-call communication and also for SIP-T
(i.e. ISUP transparency).

It has been used for, but is not recommended, DTMF communication. RFC 2833
is the recommendation for that.

Further to this, and proprietary messages, services, etc. use INFO method as
well. This sounds like what you want to do here. 

 


  _____  


From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Darko Milic
Sent: Sunday, September 18, 2005 4:06 AM
To: discussion at sipforum.org
Subject: [SIPForum-discussion] INFO method

 

Hi all,


I am curious about usage of INFO method. Actually, I need advice. I haven’t
noticed any practical solution that uses this method yet. Like it’s not
popular method for using today. Maybe I am wrong, but I have feeling that
MESSAGE within dialog could do the same job; exchange signaling information
among parties.

My intention is to send some additional signaling information important for
upper application immediately after SIP dialog (with INVITE) has been
opened. Questions are: What should I use? What is the preferable method
today for such things? Is there some RFC that obsolete RFC 2976 (INFO)?

Regards,
Darko 



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