[OpenSIPS-Users] Managing the implicit subscription and its NOTIFYs within B2BUA REFER handling

[Vlad Patrascu]

Hi Jeff,

Sending NOTIFYs is supported by using the "n" flag for the b2b_bridge() 
[1] function. Just note that some mechanisms from RFC 3515 2.4.4 
<https://datatracker.ietf.org/doc/html/rfc3515#section-2.4.4> are not 
implemented though, such as the ability to terminate the subscription 
prematurely by unsubscribing or refreshing the subscription.

[1] https://opensips.org/docs/modules/3.2.x/b2b_logic.html#func_b2b_bridge

Regards,

-- 
Vlad Patrascu
OpenSIPS Core Developer
http://www.opensips-solutions.com

On 24.01.2022 17:38, Jeff Pyle wrote:
> OpenSIPS 3.2 supports some slick in-script B2B functions, documented 
> here [1] < [1] 
> https://www.opensips.org/Documentation/Tutorials-B2BUA-3-2#toc10> with 
> an example for handling REFER.  Does this approach include support for 
> the subscription and the subsequent NOTIFYs required by RFC 3515 2.4.4 
> [2] <https://datatracker.ietf.org/doc/html/rfc3515#section-2.4.4>?
>
> I have a need to write some REFER handling functions into an existing 
> OpenSIPS SBC stack, and I need to send accurate NOTIFYs back to the 
> REFER-er.  Terminating the subscription with the first NOTIFY isn't 
> good enough, sadly.  I'm hoping this is the right way to do it.
>
>   [1] https://www.opensips.org/Documentation/Tutorials-B2BUA-3-2#toc10 
> <https://www.opensips.org/Documentation/Tutorials-B2BUA-3-2#toc10>
>   [2] https://datatracker.ietf.org/doc/html/rfc3515#section-2.4.4 
> <https://datatracker.ietf.org/doc/html/rfc3515#section-2.4.4>
>
>
> - Jeff
>
>
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