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Re: [Sip] B2BUA question.
Hi,
I do not understand what you mean by "ONLY", but I will take a stab at a
response anyway. If by "ONLY" you mean that it does not implement other
protocols, the answer is no. A B2BUA can receive a SIP request acting as
a SIP UAC, send an LDAP query acting as an LDAP client, and then send a
SIP request acting as a SIP UAC.
A B2BUA handles two dialogs, and it behaves as a UA for both dialogs.
The B2BUA typically uses information in requests or responses in one
dialog to create requests or responses in the other one. An example of a
B2BUA is a 3rd party call controller.
Regards,
Gonzalo
"Padhye, Chinmay" wrote:
>
> Hello,
>
> Thanks for the reply.
>
> So the B2BUA logical entity is a combination of "ONLY" the UAC and UAS logical entities. Is this an accurate statement?
>
> Regards,
>
> Chinmay
>
> -----Original Message-----
> From: Bert Culpepper [mailto:bertculpepper@netscape.net]
> Sent: Wednesday, November 06, 2002 6:23 PM
> To: Padhye, Chinmay
> Cc: sip@ietf.org
> Subject: Re: [Sip] B2BUA question.
>
> Hi,
>
> I'll provide my opinion on why this term was included in RFC3261, other
> folks may provide different/better reasons.
>
> The previous RFC defined UAC, UAS, Registar, Proxy, and Redirect Server
> logical entities. As services (both legacy and new) were designed using
> SIP, it was determined that a combination of defined logical entities
> was needed to implement the services and still be compliant with the
> specification. This particular combination became common enough that (I
> presume) the authors thought it should be mentioned in the new RFC, to
> avoid mis-interpretation.
>
> Regards,
> Bert
>
> Padhye, Chinmay wrote:
>
> > Hello,
> >
> > This is from the definition of B2BUA from RFC 3261 -
> >
> > 'Since it is a concatenation of a UAC and UAS, no explicit definitions are needed for its behavior."
> >
> > Since the behavior of a B2BUA is the same as the behavior of a UAC/UAS, what was the need for defining a new logical entity - B2BUA? I am trying to understand the motivation behind adding this definition in the RFC.
> >
> > Regards,
> >
> > Chinmay
> > _______________________________________________
> > Sip mailing list https://www1.ietf.org/mailman/listinfo/sip
> > This list is for NEW development of the core SIP Protocol
> > Use sip-implementors@cs.columbia.edu for questions on current sip
> > Use sipping@ietf.org for new developments on the application of sip
> >
> >
>
> _______________________________________________
> Sip mailing list https://www1.ietf.org/mailman/listinfo/sip
> This list is for NEW development of the core SIP Protocol
> Use sip-implementors@cs.columbia.edu for questions on current sip
> Use sipping@ietf.org for new developments on the application of sip
--
Gonzalo Camarillo Phone : +358 9 299 33 71
Oy L M Ericsson Ab Mobile: +358 40 702 35 35
Telecom R&D Fax : +358 9 299 30 52
FIN-02420 Jorvas Email : Gonzalo.Camarillo@ericsson.com
Finland http://www.hut.fi/~gonzalo
_______________________________________________
Sip mailing list https://www1.ietf.org/mailman/listinfo/sip
This list is for NEW development of the core SIP Protocol
Use sip-implementors@cs.columbia.edu for questions on current sip
Use sipping@ietf.org for new developments on the application of sip