There is net-libs/pjproject version 2.6 is released https://blog.pjsip.org/2017/01/26/pjsip-version-2-6-is-released-with-uwp-wp8-x-support/ As usual the release also includes several enhancements and bug fixes: adding AES-GCM SRTP cipher-suites, OpenH264 1.6.0 support, OpenSSL 1.1.0 support, critical bug fixes in IPv6, ICE, and DNS resolver.
This is in the tree now, thank you for your report.