<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">what may cause this, and how can I fix it ?<div class=""><span style="color: rgb(248, 248, 241); font-family: Menlo; background-color: rgb(21, 38, 56);" class=""> </span><span style="font-family: Menlo; background-color: rgb(21, 38, 56); color: rgb(255, 108, 105);" class=""><b class="">WARNING</b></span><span style="color: rgb(248, 248, 241); font-family: Menlo; background-color: rgb(21, 38, 56);" class="">[23010]: </span><span style="font-family: Menlo; background-color: rgb(21, 38, 56); color: rgb(179, 188, 196);" class=""><b class="">pjsip</b></span><span style="color: rgb(248, 248, 241); font-family: Menlo; background-color: rgb(21, 38, 56);" class="">:</span><span style="font-family: Menlo; background-color: rgb(21, 38, 56); color: rgb(179, 188, 196);" class=""><b class="">0</b></span><span style="color: rgb(248, 248, 241); font-family: Menlo; background-color: rgb(21, 38, 56);" class=""> </span><span style="font-family: Menlo; background-color: rgb(21, 38, 56); color: rgb(179, 188, 196);" class=""><b class=""><?></b></span><span style="color: rgb(248, 248, 241); font-family: Menlo; background-color: rgb(21, 38, 56);" class="">: </span><span class="Apple-tab-span" style="color: rgb(248, 248, 241); font-family: Menlo; white-space: pre; background-color: rgb(21, 38, 56);"> </span><span style="color: rgb(248, 248, 241); font-family: Menlo; background-color: rgb(21, 38, 56);" class="">tsx0x7f24f41b2 ..Failed to send Request msg NOTIFY/cseq=15293 (tdta0x7f2480001a70)! err=171064 (Unsuitable transport selected (PJSIP_ETPNOTSUITABLE))</span></div></body></html>