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

[Jeff Pyle]

Great.  Is it still recommended to keep a particular OpenSIPS instance
either all proxy commands or all B2B commands?  Or, do we have some
flexibility to mix them since B2B commands live in the script now?


- Jeff


On Wed, Jan 26, 2022 at 9:50 AM Vlad Patrascu <vladp at opensips.org> wrote:

> 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 Developerhttp://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] 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
>   [2]  https://datatracker.ietf.org/doc/html/rfc3515#section-2.4.4
>
>
> - Jeff
>
>
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