Alright, Thanks for inputs! I can successfully Register with FS on TLS now. The issue was not the CA root certificate nor domains requirement or Signed certificate, but it was because client certificate were not properly installed. (For those , trying on 3CX , you have to rename "cafile.pem" to "root_cert_3CXPHONE.pem"). Now, the problem is internal calling! and i guess it is same as Limitations of the Freeswitch TLS/SSLv23 Implementation (FS-3877) <http://wiki.freeswitch.org/wiki/SIP_TLS#Limitations_of_the_Freeswitch_TLS.2FSSLv23_Implementation_.28FS-3877.29> . I have been looking for the solution but coudnt get that yet! I can make call from A but the called party B does not rang, but then i can call B to A and it rings (strange, as both are in same network , same NAT). Can one can guide me step wise what to do now ! ? -- View this message in context: http://freeswitch-users.2379917.n2.nabble.com/FS-with-SSL-TLS-issues-tp75877... Sent from the freeswitch-users mailing list archive at Nabble.com.