[sr-dev] [kamailio/kamailio] SIP Race condition when using dlg.end_dlg (Issue #4268)

IgorrG created an issue (kamailio/kamailio#4268) ### Description We use RPC dlg.end_dlg command to terminate dialog. In most cases it does operate properly and send BYE from kamailio to both sides of dialog (as show on screenshot). ![Image](https://github.com/user-attachments/assets/b49164a5-

[sr-dev] [kamailio/kamailio] branch_failure_route does not handle reply while wt_timer period (Issue #4266)

IgorrG created an issue (kamailio/kamailio#4266) ### Description While implementing mid-register inspired by pull request (https://github.com/kamailio/kamailio/pull/3360) we found the case when it goes impossible to handle responses for registrar servers. In case some of registrars busy and re