With the release of PJSIP version 1.10, the svn repository for version 1.x has been moved from trunk to a new branch:
If you are monitoring the SVN trunk version, please switch your repository to the URL above. This can be done easily by running the following command in your work directory:
$ svn switch http://svn.pjsip.org/repos/pjproject/branches/1.x
Later we will put 2.0 development into the svn trunk, but for now, we have equipped the svn trunk with a build error to make people aware that the location has been changed.