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

[Liviu Chircu]

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