Test wip sippy b2bua.

Author: sobomax

.github/workflows/main.yml

@@ -81,7 +81,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        mm-branch: ['master', 'PRACK']
+        mm-branch: ['wip', 'PRACK']
         rtppc-type: ['unix', 'cunix', 'udp', 'udp6', 'tcp', 'tcp6']
         python-version: ['3.9', '3.10', '3.11', '3.12', '3.13-dev']