The commit message is not good, it is `Update usrloc_cb.c`, whichd doesn't describe what the patch does, not it follows the guidelines for contributions. Actually, the title of this pull request is suitable for commit message -- see:
* https://github.com/kamailio/kamailio/blob/master/.github/CONTRIBUTING.md#com...
Can you rework the patch so it has proper commit message as well as amend the documentation to reflect the use of outbound proxy for publish as well?