VoIP using PjSIP : pjsua_acc.c SIP registration failed, status=408 (Request Timeout)
问题 I am trying to run test VoIP program as given in http://www.pjsip.org/pjsip/docs/html/page_pjsip_sample_simple_pjsuaua_c.htm I am trying public SIP servers present at http://www1.cs.columbia.edu/sip/servers.html But I always get error message as 14:33:25.515 pjsua_acc.c SIP registration failed, status=408 (Request Timeout) I never used SIP before, I am not able to guess where the problem is. Is there any simple way to test SIP servers? Does anybody know public free SIP server that works?