[OpenSIPS-Users] [Blog] SIP PRACK/UPDATE Interworking Support in OpenSIPS 4.0

[Johan De Clercq]

Nice.

On Wed, Mar 25, 2026, 11:06 Liviu Chircu <liviu at opensips.org> wrote:

> Hi all,
>
> A frequent interoperability problem when bridging IMS and legacy SIP
> networks is the handling of SIP PRACK and mid-dialog UPDATE requests.
>
> These signaling mechanisms are often expected on one side of the
> network, while the other side may not support them at all. The result is
> failed call setup, broken early media, or unsuccessful session updates.
>
> With OpenSIPS 4.0, you can solve these problems either by enabling a
> single dialog flag or by handling the signaling manually, with full
> scripting control.
>
> Check out our latest blog post for more details:
>
>
> https://blog.opensips.org/2026/03/25/sip-prack-interworking-support-in-opensips-4-0/
>
> --
> Liviu Chircu
> www.opensips-solutions.com | www.siphub.com
>
>
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> Users at lists.opensips.org
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>
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