Introduction

This page is to describe details as to the usage of gdb with Kamailio.

If you wish to debug a function that is triggered by a timer (e.g., tm/dialog callbacks issued from transaction timeouts) you need to attach gdb to the Kamailio timer process. Specifically, you cannot simply start the Kamailio binary from gdb since the initial Kamailio process does not handle timeouts. Consequently, breakpoints you set on the initial process which you expect to fire won't do so if they are timer-triggered.

In order to tell which Kamailio process corresponds to the timer process, you can use kamctl ps and check for the process with Type=timer.