B2BUA - invite without a registration

ok.. lemme restate the statement

all users are supposed to register at the B2BUA.
now A calling B.
and B is registered, but A isn't
so wot happens at the B2BUA, when A tries to call B?
duz the B2BUA send a Forbidden, or it registers A and then
fwds the call 
to B??
if B2BUA registers A, wot is the expiry time, n other
details??

thanx in advance.

- Ben.


kishore sowdi wrote:

> hi,
>  
> question not clear ... the person who calls is 'caller'
and whom he 
> calls is 'callee' ...
>  
> if u mean incoming invite at the callee and callee not
being 
> registered ... then callee should ideally drop the
packet ... since he 
> hasn't undergone reg he shouldn't even attempt to send
any error 
> responses .... usually implemenation will initiate
responding and 
> requesting only after registration....
>  
> regards,
> kishore
>
> */Benjamin Jacob <benjamin.jacobmasconit.com>/* wrote:
>
>     Hello ppl,
>     What is the defined behaviour for an incoming
INVITE, when the caller
>     hasn't yet registered with the B2BUA?
>
>     cheerz
>     - Ben.
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>     Sip-implementors mailing list
>     Sip-implementorscs.columbia.edu
>     https://lists.cs.columbia.edu/cucslists/listinf
o/sip-implementors
>
>
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Benjamin Jacob wrote:
> ok.. lemme restate the statement
>
> all users are supposed to register at the B2BUA.
> now A calling B.
> and B is registered, but A isn't
> so wot happens at the B2BUA, when A tries to call B?
> duz the B2BUA send a Forbidden, or it registers A and
then fwds the call 
> to B??
> if B2BUA registers A, wot is the expiry time, n other
details??
>
>   
There is no standard behavior what a B2BUA may do in this
scenario.  My 
personal preference is just to Authenticate the call with a
407 and let 
it be routed normally. 
> thanx in advance.
>
> - Ben.
>
>
> kishore sowdi wrote:
>
>   
>> hi,
>>  
>> question not clear ... the person who calls is
'caller' and whom he 
>> calls is 'callee' ...
>>  
>> if u mean incoming invite at the callee and callee
not being 
>> registered ... then callee should ideally drop the
packet ...
I am not sure why an INVITE would be ignored by the UAS if
its not 
registered.   
>>  since he 
>> hasn't undergone reg he shouldn't even attempt to
send any error 
>> responses .... usually implemenation will initiate
responding and 
>> requesting only after registration....
>>     
Why wouldn't you respond back with an error response?  
Don't you want 
the UAC's retransmission of the ignored INVITE to stop? If
an INVITE 
catches the UA in a "bad state" then  just respond
back with 503 Service 
Unavailable or the more polite 480 Temporarily Not
Available.
>>  
>> regards,
>> kishore
>>
>> */Benjamin Jacob <benjamin.jacobmasconit.com>/* wrote:
>>
>>     Hello ppl,
>>     What is the defined behaviour for an incoming
INVITE, when the caller
>>     hasn't yet registered with the B2BUA?
>>
>>     cheerz
>>     - Ben.
>>     _______________________________________________
>>     Sip-implementors mailing list
>>     Sip-implementorscs.columbia.edu
>>     https://lists.cs.columbia.edu/cucslists/listinf
o/sip-implementors
>>
>>
>>     
> _______________________________________________
> Sip-implementors mailing list
> Sip-implementorscs.columbia.edu
> https://lists.cs.columbia.edu/cucslists/listinf
o/sip-implementors
>
>
>   

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> all users are supposed to register at the B2BUA.
> now A calling B.
> and B is registered, but A isn't
> so wot happens at the B2BUA, when A tries to call B?
> duz the B2BUA send a Forbidden, or it registers A and 
> then fwds the call to B??

Since it is a "service" at the B2BUA, it basically
can do whatever it
wishes.  

Some allow the INVITE to continue.

Some ignore the INVITE.  

Some return 403 after potentially playing a treatment first.

I am not aware of B2BUAs attempting to treat the INVITE's
Contact as a
registered location; however it wouldn't surprise me.  Note
that such
functionality has not been standardized within the IETF SIP
working
group.  And thus, some would likely call it a bug instead of
an implied
registration service.


> if B2BUA registers A, wot is the expiry time, n other
details?

The "expiry time, n other details" are the reasons
why it would likely
never be standardized.

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