Hi all I'm a Freeswitch newbie and I'm trying to setup SIP over TLS in my FS version 1.5.15. As first step I have configured a SIP Gateway that successfully registers to a dedicated SIP Registrar/Proxy (opensips) using SIP over UDP. With this configuration I can successfully place outbound and inbound calls without any problem. Everything works as a charm. Further I have tried to switch to SIP over TLS and I followed the steps described in https://freeswitch.org/confluence/display/FREESWITCH/SIP+TLS. I have installed the agent.pem and cafile.pem generated by opensips (my SIP Registrar) and I configured FS to use them. After restart the sofia gateway profile can successfully register to the SIP Registrar by SIP over TLS. Further I can successfully place outbound call (from internal channel through the SIP gateway). It sounds great! Unfortunately FS fails to handle inbound calls (SIP INVITE from an external SIP UA registered to the same SIP Registrar to the SIP UA extension of the FS SIP gateway). I have tried to trace all the logs I can. Here below some traces from the FS console when an inbound INVITE is received: tport.c:2749 tport_wakeup_pri() tport_wakeup_pri(0xb7f28): events IN tport.c:862 tport_alloc_secondary() tport_alloc_secondary(0xb7f28): new secondary tport 0x1398c0 tport_type_tcp.c:203 tport_tcp_init_secondary() tport_tcp_init_secondary(0x1398c0): Setting TCP_KEEPIDLE to 30 tport_type_tcp.c:209 tport_tcp_init_secondary() tport_tcp_init_secondary(0x1398c0): Setting TCP_KEEPINTVL to 30 tport_type_tls.c:610 tport_tls_accept() tport_tls_accept(0x1398c0): new connection from tls/10.3.10.110:38632/sips tport_tls.c:919 tls_connect() tls_connect(0x1398c0): events NEGOTIATING tport_tls.c:1008 tls_connect() tls_connect(0x1398c0): TLS setup failed (error:00000001:lib(0):func(0):reason(1)) tport.c:2090 tport_close() tport_close(0x1398c0): tls/10.3.10.110:38632/sips tport.c:2263 tport_set_secondary_timer() tport(0x1398c0): set timer at 0 ms because zap In order to simplify the test I have also tried to connect to the 5061 TLS port by a simple openssl command from a linux shell of the SIP Registrar box: openssl s_client -connect 10.11.4.103:5061 -tls1_2 CONNECTED(00000003) 3074304200:error:14094410:SSL routines:SSL3_READ_BYTES:sslv3 alert handshake failure:s3_pkt.c:1256:SSL alert number 40 3074304200:error:1409E0E5:SSL routines:SSL3_WRITE_BYTES:ssl handshake failure:s3_pkt.c:596: --- no peer certificate available --- No client certificate CA names sent --- SSL handshake has read 7 bytes and written 0 bytes --- New, (NONE), Cipher is (NONE) Secure Renegotiation IS NOT supported Compression: NONE Expansion: NONE SSL-Session: Protocol : TLSv1.2 Cipher : 0000 Session-ID: Session-ID-ctx: Master-Key: Key-Arg : None PSK identity: None PSK identity hint: None SRP username: None Start Time: 1528361426 Timeout : 7200 (sec) Verify return code: 0 (ok) --- In the FS console I read the same traces received in the previous test with the inbound call. tport.c:2749 tport_wakeup_pri() tport_wakeup_pri(0xb7f28): events IN tport.c:862 tport_alloc_secondary() tport_alloc_secondary(0xb7f28): new secondary tport 0x248210 tport_type_tcp.c:203 tport_tcp_init_secondary() tport_tcp_init_secondary(0x248210): Setting TCP_KEEPIDLE to 30 tport_type_tcp.c:209 tport_tcp_init_secondary() tport_tcp_init_secondary(0x248210): Setting TCP_KEEPINTVL to 30 tport_type_tls.c:610 tport_tls_accept() tport_tls_accept(0x248210): new connection from tls/10.11.4.103:33168/sips tport_tls.c:919 tls_connect() tls_connect(0x248210): events NEGOTIATING tport_tls.c:1008 tls_connect() tls_connect(0x248210): TLS setup failed (error:00000001:lib(0):func(0):reason(1)) tport.c:2090 tport_close() tport_close(0x248210): tls/10.11.4.103:33168/sips tport.c:2263 tport_set_secondary_timer() tport(0x248210): set timer at 0 ms because zap I have attached also a wireshark capture of the inbound call. In this capture the SIP Registrar has IP 10.3.10.110. The FS device is 10.11.4.103. The Client Hello is sent by the SIP Registrar, but the FS device replies with an "Alert: Level: fatal, Description: handshake failure (40). I guess that there is some misconfiguration related to the TLS version or proposed ciphers or any certifcates but I cannot understand what. For comparison I have tried to run the same openssl command from FS to the external SIP Registrar (outbound). openssl s_client -connect 10.3.10.110:5061 -tls1_2 CONNECTED(00000003) depth=1 CN = Your_NAME, ST = Your_STATE, C = CO, emailAddress = YOUR_EMAIL, O = YOUR_ORG_NAME verify error:num=19:self signed certificate in certificate chain verify return:0 --- Certificate chain 0 s:/C=XY/ST=Some State/O=My Large Organization Name/OU=My Subunit of Large Organization/CN=somename.somewhere.com/emailAddress=root@somename.somewhere.com i:/CN=Your_NAME/ST=Your_STATE/C=CO/emailAddress=YOUR_EMAIL/O=YOUR_ORG_NAME 1 s:/CN=Your_NAME/ST=Your_STATE/C=CO/emailAddress=YOUR_EMAIL/O=YOUR_ORG_NAME i:/CN=Your_NAME/ST=Your_STATE/C=CO/emailAddress=YOUR_EMAIL/O=YOUR_ORG_NAME --- Server certificate -----BEGIN CERTIFICATE----- MIIC6TCCAdGgAwIBAgIBATANBgkqhkiG9w0BAQUFADBpMRIwEAYDVQQDFAlZb3Vy X05BTUUxEzARBgNVBAgUCllvdXJfU1RBVEUxCzAJBgNVBAYTAkNPMRkwFwYJKoZI hvcNAQkBFgpZT1VSX0VNQUlMMRYwFAYDVQQKFA1ZT1VSX09SR19OQU1FMB4XDTE4 MDUwODEyMzcyM1oXDTE5MDUwODEyMzcyM1owgb8xCzAJBgNVBAYTAlhZMRMwEQYD VQQIEwpTb21lIFN0YXRlMSMwIQYDVQQKExpNeSBMYXJnZSBPcmdhbml6YXRpb24g TmFtZTEpMCcGA1UECxMgTXkgU3VidW5pdCBvZiBMYXJnZSBPcmdhbml6YXRpb24x HzAdBgNVBAMTFnNvbWVuYW1lLnNvbWV3aGVyZS5jb20xKjAoBgkqhkiG9w0BCQEW G3Jvb3RAc29tZW5hbWUuc29tZXdoZXJlLmNvbTBcMA0GCSqGSIb3DQEBAQUAA0sA MEgCQQDL7uikSc1kVIvw5rhyQzk2dSJcmJ6EJ1LSmtAoafZH8bqfZ25cDQZQGi05 YcuxGR0vSaW7xPnyhaWCLQlxQFx7AgMBAAGjDTALMAkGA1UdEwQCMAAwDQYJKoZI hvcNAQEFBQADggEBAHv4WzGdYhoEyHZmBQTVjdEKOVBMnNoOqum79uzWtSzSjG4E pP/9c331uT7fBZ/Z7XNhIV+PbDZXorLgUhwwT7zxYURNnV52Of2SWRmWtPBrgEX1 +8S0IMtJFfJta8FAfTTaNqLpRDaiTQs3em1Maxls15cTyRQzMIjIJnY4eRrh5CNM YV/+kg/lpKAe0awiMu96cxpnMdz9h33g7RedBnh9wDi6k7pfYtvlC6o4snZO01AN 8qRiQf54OPvKcVeseJFBPWLhdYns6g+/SXhq1Lek2us93ZpuKgIaBtzkyDm2+SFa QXF9f0a+UuEdPvrtvMjAijcDwcaXq0r2f2MA++M= -----END CERTIFICATE----- subject=/C=XY/ST=Some State/O=My Large Organization Name/OU=My Subunit of Large Organization/CN=somename.somewhere.com/emailAddress=root@somename.somewhere.com issuer=/CN=Your_NAME/ST=Your_STATE/C=CO/emailAddress=YOUR_EMAIL/O=YOUR_ORG_NAME --- No client certificate CA names sent --- SSL handshake has read 1979 bytes and written 337 bytes --- New, TLSv1/SSLv3, Cipher is AES256-GCM-SHA384 Server public key is 512 bit Secure Renegotiation IS NOT supported Compression: NONE Expansion: NONE SSL-Session: Protocol : TLSv1.2 Cipher : AES256-GCM-SHA384 Session-ID: EA8B17008E58F1D04CD1CEA53103CF477AA9DE0DC80A4FF4F0DD4814031E4C15 Session-ID-ctx: Master-Key: D28ED5C21D288944D2277AF86FE82A9BF3BEDABAA14DBCD5AE32B190EF0A0CA6AB99719E751E6DD4FECAA9DD1307A3C0 Key-Arg : None PSK identity: None PSK identity hint: None SRP username: None TLS session ticket lifetime hint: 300 (seconds) TLS session ticket: 0000 - 2f c5 82 ea bf 8b 66 49-bc bc ee 48 1a fb 8e 6c /.....fI...H...l 0010 - de 42 d9 e0 6e 36 40 78-06 cc 68 c6 74 6d 6e aa .B..n6@x..h.tmn. 0020 - b6 53 8a ed b2 8d 5a c4-02 e1 88 8b d2 a9 56 5f .S....Z.......V_ 0030 - ee c6 b9 14 55 da 37 df-8f aa af 81 b4 22 4e be ....U.7......"N. 0040 - 9c c5 87 d6 46 22 47 03-4a 88 dd 1e 9d 05 81 09 ....F"G.J....... 0050 - c3 8b 9f 44 29 90 4d 93-c9 f5 41 e2 4d 72 1b de ...D).M...A.Mr.. 0060 - 8d c2 15 ab 49 ad da 26-0e 72 a9 01 02 3e 89 33 ....I..&.r...>.3 0070 - 6e 6c 2f 20 1c 15 06 7a-8d c5 a6 6e ee 46 d2 76 nl/ ...z...n.F.v 0080 - 63 c1 89 1e 9b 3c a1 10-d0 78 31 9e e6 8e 86 ab c....<...x1..... 0090 - ff bc 3a 4c ab 3d 33 8f-e9 56 c5 f1 45 46 73 41 ..:L.=3..V..EFsA Start Time: 1528361487 Timeout : 7200 (sec) Verify return code: 19 (self signed certificate in certificate chain) --- closed In this case the command seems to have been successfully executed. I remark that the outbound TLS transactions seems to be working fine also from FS (SIP Registrar, SIP INVITE in outbound don't have any problem). If required I can provide also the FS configuration files (vars.xml, sofia.conf.xml, etc etc). Any help will be greatly appreciated. Thanks in advance Best regards fabio