What are you trying to fix? Are you not getting ring indicator tone
back from one of your carriers?
In practice you shouldn't be generating any provisional responses
except for 100 Trying. In the voice world at least this is generally
regarded as a bad idea.
RFC3261 specifically makes no distinction between a proxy and a B2BUA
other than this:
6 Definitions
Back-to-Back User Agent: A back-to-back user agent (B2BUA) is a
logical entity that receives a request and processes it as a
user agent server (UAS). In order to determine how the
request
should be answered, it acts as a user agent client (UAC) and
generates requests. Unlike a proxy server, it maintains
dialog
state and must participate in all requests sent on the dialogs
it has established. Since it is a concatenation of a UAC and
UAS, no explicit definitions are needed for its behavior.
So "proxy" and "b2bua" are very ambiguous. Based on that definition,
one would be going out on a limb to say "A B2BUA can do more than a
proxy can."
The differentiator between a B2BUA and a Proxy Server IMHO is the
session mediation features you typically find in a B2BUA such as call
routing, answer/disconnect supervision, etc. Mediation is not
defined by RFC3261, only Initiation.
An interesting draft to see would be "Session Mediation with the
Session Initiation Protocol and Session Description Protocol"
Cheers
-Daniel
On Mar 8, 2007, at 4:46 PM, Sunil Kumar Verma wrote:
>
> Thanks Paul and Uttam.
>
> I have B2BUA, so we can say that B2BUA can generate 180 RINGING for
> the call which are yet to be answered at the far end??
> Caller receives ringback tone only if the called party is ringing..
> Think of a scenario..
> if the called user has voice mail configured and due to some network
> problem his client
> ,after registering to B2BUA, is out of network. The B2BUA still
> consider
> that the user is available
> and if somebody tries to reach that user he hear deaf silence and
> then
> after 10 to 15 sec the call goes to Voice mail.
> Is there any way we can avoid the deaf scilence in case of B2BUA?
>
> Regards
> Sunil Verma
>
>
>
>
>
>
>
> -----Original Message-----
> From: Paul Kyzivat [mailto:[EMAIL PROTECTED]
> Sent: Thursday, March 08, 2007 3:36 PM
> To: Sarkar, Uttam
> Cc: Sunil Kumar Verma; [email protected]
> Subject: Re: [Sip-implementors] 180 Ringing from Proxy(BBUA)
>
>
>
>
> Sarkar, Uttam wrote:
>> Nope. It can send 100 Trying.
>> 180 would have "totag" that would create a dialog. Without getting
>> any
>> reponse from client B. You can't create a dialog.
>
> That is correct answer for a proxy. For a B2BUA almost anything is
> possible. It depends on what the B2BUA is trying to accomplish.
>
> Paul
>
>> -----Original Message-----
>> From: [EMAIL PROTECTED]
>> [mailto:[EMAIL PROTECTED] On Behalf Of Sunil
>> Kumar Verma
>> Sent: Thursday, March 08, 2007 1:52 PM
>> To: [email protected]
>> Subject: [Sip-implementors] 180 Ringing from Proxy(BBUA)
>>
>>
>>
>> Hi,
>>
>> In case of BBUA, is it possible for proxy to generate 1xx response
>> for an INVITE, before receiving any reply from
>> terminating SIP client.
>> For Ex. SIP client A calling another SIP client B, and before
>> receiving any reply from the SIP client B for the initial
>> INVITE, can proxy generate 180 RINIGING reply?
>>
>> Thanks
>> Sunil verma
>>
>>
>>
>>
>>
>>
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