Crash observed with pjsip 2.4.5, but this has been reported previously, here; http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/2015-July/018518.html Steps to reproduce; 1. Create a NAT64 network using Mac OS X 10.11 - https://developer.apple.com/library/ios/documentation/NetworkingInternetWeb/Conceptual/NetworkingOverview/UnderstandingandPreparingfortheIPv6Transition/UnderstandingandPreparingfortheIPv6Transition.html#//apple_ref/doc/uid/TP40010220-CH213-SW16 2. Connect iPhone to newly created NAT64 Wi-Fi network 3. Open an app using pjsip on the iPhone This results in the following failed assertion and causes the app to abort Assertion failed: (a->addr.sa_family == PJ_AF_INET || a->addr.sa_family == PJ_AF_INET6), function pj_sockaddr_get_len, file ../src/pj/sock_common.c, line 388. -------------- next part -------------- A non-text attachment was scrubbed... Name: smime.p7s Type: application/pkcs7-signature Size: 4112 bytes Desc: not available URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20160126/bdf9f0dd/attachment.p7s>