Hi, I found this old-thread[1], which describes the issue I'm facing, it doesn't seem to be fixed even on the most recent release pjsip-2.9. for now i'm using an unofficial binding[2] which seems to work with python3.7 but it is based on pjsua 1.x . Can you please fix it in the subsequent release. [1] https://www.spinics.net/lists/pjsip/msg20666.html [2] https://github.com/mgwilliams/python3-pjsip.git Thanks and regards, Malar.