<div dir="ltr">Hi, All!<br><br>Freeswitch-1 sends 200 OK to Freeswitch-2 via IPv6.<br>Freeswitch-2 received these packets and it can be seen in sip trace.<br>However Freeswitch-2 does not send ACK.<br> <br>recv 1184 bytes from tls/[2a02:7b43:1eb0:eb21::2]:5061 at 13:20:35.903592:<br>   ------------------------------------------------------------------------<br>   SIP/2.0 200 OK<br>   Via: SIP/2.0/TLS [2a02:f680:e0:1210::2123]:5061;branch=z9hG4bKZ2359mFaFv98p;rport=55317<br>   From: "Extension 1000" <sip:1000@[2a02:f680:e0:1210::2123]>;tag=y912pHDgNp3QF<br>   To: <sip:1000@[2a02:7b43:1eb0:eb21::2]:5061>;tag=pNyNt1y311K1F<br>   Call-ID: 6b3983f9-e0f1-1236-0d9d-525400af4b7f<br>   CSeq: 123631351 INVITE<br>   Contact: <sip:1000@[2a02:7b43:1eb0:eb21::2]:5061;transport=udp><br>   User-Agent: FreeSWITCH-mod_sofia/1.6.19+git~20171120T163416Z~b1b21d0695~64bit<br>   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY<br>   Supported: timer, path, replaces<br>   Allow-Events: talk, hold, conference, refer<br>   Content-Type: application/sdp<br>   Content-Disposition: session<br>   Content-Length: 339<br>   X-FS-Display-Name: Outbound Call<br>   X-FS-Display-Number: sip:1000%@[2a02:7b43:1eb0:eb21::2]<br>   X-FS-Support: update_display,send_info<br>   <br>   v=0<br>   o=FreeSWITCH 1527902766 1527902767 IN IP6 2a02:7b43:1eb0:eb21::2<br>   s=FreeSWITCH<br>   c=IN IP6 2a02:7b43:1eb0:eb21::2<br>   t=0 0<br>   m=audio 32068 RTP/SAVP 8 101<br>   a=rtpmap:8 PCMA/8000<br>   a=rtpmap:101 telephone-event/8000<br>   a=fmtp:101 0-16<br>   a=ptime:20<br>   a=crypto:1 AEAD_AES_256_GCM_8 inline:LshmymiWylaGtFqTrEo3mLmx5sVN0Th32k7FSPcjicE4sDva+ZM4tlP2gck<br>   ------------------------------------------------------------------------<br>recv 1184 bytes from tls/[2a02:7b43:1eb0:eb21::2]:5061 at 13:20:37.903708:<br>   ------------------------------------------------------------------------<br>   SIP/2.0 200 OK<br>   Via: SIP/2.0/TLS [2a02:f680:e0:1210::2123]:5061;branch=z9hG4bKZ2359mFaFv98p;rport=55317<br>   From: "Extension 1000" <sip:1000@[2a02:f680:e0:1210::2123]>;tag=y912pHDgNp3QF<br>   To: <sip:1000@[2a02:7b43:1eb0:eb21::2]:5061>;tag=pNyNt1y311K1F<br>   Call-ID: 6b3983f9-e0f1-1236-0d9d-525400af4b7f<br>   CSeq: 123631351 INVITE<br>   Contact: <sip:1000@[2a02:7b43:1eb0:eb21::2]:5061;transport=udp><br>   User-Agent: FreeSWITCH-mod_sofia/1.6.19+git~20171120T163416Z~b1b21d0695~64bit<br>   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY<br>   Supported: timer, path, replaces<br>   Allow-Events: talk, hold, conference, refer<br>   Content-Type: application/sdp<br>   Content-Disposition: session<br>   Content-Length: 339<br>   X-FS-Display-Name: Outbound Call<br>   X-FS-Display-Number: sip:1000%@[2a02:7b43:1eb0:eb21::2]<br>   X-FS-Support: update_display,send_info<br>   <br>   v=0<br>   o=FreeSWITCH 1527902766 1527902767 IN IP6 2a02:7b43:1eb0:eb21::2<br>   s=FreeSWITCH<br>   c=IN IP6 2a02:7b43:1eb0:eb21::2<br>   t=0 0<br>   m=audio 32068 RTP/SAVP 8 101<br>   a=rtpmap:8 PCMA/8000<br>   a=rtpmap:101 telephone-event/8000<br>   a=fmtp:101 0-16<br>   a=ptime:20<br>   a=crypto:1 AEAD_AES_256_GCM_8 inline:LshmymiWylaGtFqTrEo3mLmx5sVN0Th32k7FSPcjicE4sDva+ZM4tlP2gck<br>   ------------------------------------------------------------------------<br>recv 1184 bytes from tls/[2a02:7b43:1eb0:eb21::2]:5061 at 13:20:41.903776:<br>   ------------------------------------------------------------------------<br>   SIP/2.0 200 OK<br>   Via: SIP/2.0/TLS [2a02:f680:e0:1210::2123]:5061;branch=z9hG4bKZ2359mFaFv98p;rport=55317<br>   From: "Extension 1000" <sip:1000@[2a02:f680:e0:1210::2123]>;tag=y912pHDgNp3QF<br>   To: <sip:1000@[2a02:7b43:1eb0:eb21::2]:5061>;tag=pNyNt1y311K1F<br>   Call-ID: 6b3983f9-e0f1-1236-0d9d-525400af4b7f<br>   CSeq: 123631351 INVITE<br>   Contact: <sip:1000@[2a02:7b43:1eb0:eb21::2]:5061;transport=udp><br>   User-Agent: FreeSWITCH-mod_sofia/1.6.19+git~20171120T163416Z~b1b21d0695~64bit<br>   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY<br>   Supported: timer, path, replaces<br>   Allow-Events: talk, hold, conference, refer<br>   Content-Type: application/sdp<br>   Content-Disposition: session<br>   Content-Length: 339<br>   X-FS-Display-Name: Outbound Call<br>   X-FS-Display-Number: sip:1000%@[2a02:7b43:1eb0:eb21::2]<br>   X-FS-Support: update_display,send_info<br>   <br>   v=0<br>   o=FreeSWITCH 1527902766 1527902767 IN IP6 2a02:7b43:1eb0:eb21::2<br>   s=FreeSWITCH<br>   c=IN IP6 2a02:7b43:1eb0:eb21::2<br>   t=0 0<br>   m=audio 32068 RTP/SAVP 8 101<br>   a=rtpmap:8 PCMA/8000<br>   a=rtpmap:101 telephone-event/8000<br>   a=fmtp:101 0-16<br>   a=ptime:20<br>   a=crypto:1 AEAD_AES_256_GCM_8 inline:LshmymiWylaGtFqTrEo3mLmx5sVN0Th32k7FSPcjicE4sDva+ZM4tlP2gck<br>   ------------------------------------------------------------------------<br>recv 1184 bytes from tls/[2a02:7b43:1eb0:eb21::2]:5061 at 13:20:45.904373:<br>   ------------------------------------------------------------------------<br>   SIP/2.0 200 OK<br>   Via: SIP/2.0/TLS [2a02:f680:e0:1210::2123]:5061;branch=z9hG4bKZ2359mFaFv98p;rport=55317<br>   From: "Extension 1000" <sip:1000@[2a02:f680:e0:1210::2123]>;tag=y912pHDgNp3QF<br>   To: <sip:1000@[2a02:7b43:1eb0:eb21::2]:5061>;tag=pNyNt1y311K1F<br>   Call-ID: 6b3983f9-e0f1-1236-0d9d-525400af4b7f<br>   CSeq: 123631351 INVITE<br>   Contact: <sip:1000@[2a02:7b43:1eb0:eb21::2]:5061;transport=udp><br>   User-Agent: FreeSWITCH-mod_sofia/1.6.19+git~20171120T163416Z~b1b21d0695~64bit<br>   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY<br>   Supported: timer, path, replaces<br>   Allow-Events: talk, hold, conference, refer<br>   Content-Type: application/sdp<br>   Content-Disposition: session<br>   Content-Length: 339<br>   X-FS-Display-Name: Outbound Call<br>   X-FS-Display-Number: sip:1000%@[2a02:7b43:1eb0:eb21::2]<br>   X-FS-Support: update_display,send_info<br>   <br>   v=0<br>   o=FreeSWITCH 1527902766 1527902767 IN IP6 2a02:7b43:1eb0:eb21::2<br>   s=FreeSWITCH<br>   c=IN IP6 2a02:7b43:1eb0:eb21::2<br>   t=0 0<br>   m=audio 32068 RTP/SAVP 8 101<br>   a=rtpmap:8 PCMA/8000<br>   a=rtpmap:101 telephone-event/8000<br>   a=fmtp:101 0-16<br>   a=ptime:20<br>   a=crypto:1 AEAD_AES_256_GCM_8 inline:LshmymiWylaGtFqTrEo3mLmx5sVN0Th32k7FSPcjicE4sDva+ZM4tlP2gck<br>   ------------------------------------------------------------------------<br>recv 1184 bytes from tls/[2a02:7b43:1eb0:eb21::2]:5061 at 13:20:49.904423:<br>   ------------------------------------------------------------------------<br>   SIP/2.0 200 OK<br>   Via: SIP/2.0/TLS [2a02:f680:e0:1210::2123]:5061;branch=z9hG4bKZ2359mFaFv98p;rport=55317<br>   From: "Extension 1000" <sip:1000@[2a02:f680:e0:1210::2123]>;tag=y912pHDgNp3QF<br>   To: <sip:1000@[2a02:7b43:1eb0:eb21::2]:5061>;tag=pNyNt1y311K1F<br>   Call-ID: 6b3983f9-e0f1-1236-0d9d-525400af4b7f<br>   CSeq: 123631351 INVITE<br>   Contact: <sip:1000@[2a02:7b43:1eb0:eb21::2]:5061;transport=udp><br>   User-Agent: FreeSWITCH-mod_sofia/1.6.19+git~20171120T163416Z~b1b21d0695~64bit<br>   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY<br>   Supported: timer, path, replaces<br>   Allow-Events: talk, hold, conference, refer<br>   Content-Type: application/sdp<br>   Content-Disposition: session<br>   Content-Length: 339<br>   X-FS-Display-Name: Outbound Call<br>   X-FS-Display-Number: sip:1000%@[2a02:7b43:1eb0:eb21::2]<br>   X-FS-Support: update_display,send_info<br>   <br>   v=0<br>   o=FreeSWITCH 1527902766 1527902767 IN IP6 2a02:7b43:1eb0:eb21::2<br>   s=FreeSWITCH<br>   c=IN IP6 2a02:7b43:1eb0:eb21::2<br>   t=0 0<br>   m=audio 32068 RTP/SAVP 8 101<br>   a=rtpmap:8 PCMA/8000<br>   a=rtpmap:101 telephone-event/8000<br>   a=fmtp:101 0-16<br>   a=ptime:20<br>   a=crypto:1 AEAD_AES_256_GCM_8 inline:LshmymiWylaGtFqTrEo3mLmx5sVN0Th32k7FSPcjicE4sDva+ZM4tlP2gck<br>   ------------------------------------------------------------------------<br>recv 1184 bytes from tls/[2a02:7b43:1eb0:eb21::2]:5061 at 13:20:53.905075:<br>   ------------------------------------------------------------------------<br>   SIP/2.0 200 OK<br>   Via: SIP/2.0/TLS [2a02:f680:e0:1210::2123]:5061;branch=z9hG4bKZ2359mFaFv98p;rport=55317<br>   From: "Extension 1000" <sip:1000@[2a02:f680:e0:1210::2123]>;tag=y912pHDgNp3QF<br>   To: <sip:1000@[2a02:7b43:1eb0:eb21::2]:5061>;tag=pNyNt1y311K1F<br>   Call-ID: 6b3983f9-e0f1-1236-0d9d-525400af4b7f<br>   CSeq: 123631351 INVITE<br>   Contact: <sip:1000@[2a02:7b43:1eb0:eb21::2]:5061;transport=udp><br>   User-Agent: FreeSWITCH-mod_sofia/1.6.19+git~20171120T163416Z~b1b21d0695~64bit<br>   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY<br>   Supported: timer, path, replaces<br>   Allow-Events: talk, hold, conference, refer<br>   Content-Type: application/sdp<br>   Content-Disposition: session<br>   Content-Length: 339<br>   X-FS-Display-Name: Outbound Call<br>   X-FS-Display-Number: sip:1000%@[2a02:7b43:1eb0:eb21::2]<br>   X-FS-Support: update_display,send_info<br>   <br>   v=0<br>   o=FreeSWITCH 1527902766 1527902767 IN IP6 2a02:7b43:1eb0:eb21::2<br>   s=FreeSWITCH<br>   c=IN IP6 2a02:7b43:1eb0:eb21::2<br>   t=0 0<br>   m=audio 32068 RTP/SAVP 8 101<br>   a=rtpmap:8 PCMA/8000<br>   a=rtpmap:101 telephone-event/8000<br>   a=fmtp:101 0-16<br>   a=ptime:20<br>   a=crypto:1 AEAD_AES_256_GCM_8 inline:LshmymiWylaGtFqTrEo3mLmx5sVN0Th32k7FSPcjicE4sDva+ZM4tlP2gck<br>   ------------------------------------------------------------------------<br>2018-06-02 13:20:55.780247 [DEBUG] sofia_reg.c:2435 Changing expire time to 897 by request of proxy sip:<a href="http://ipvs.sipnet.ru:5061">ipvs.sipnet.ru:5061</a><br>recv 1184 bytes from tls/[2a02:7b43:1eb0:eb21::2]:5061 at 13:20:57.905810:<br>   ------------------------------------------------------------------------<br>   SIP/2.0 200 OK<br>   Via: SIP/2.0/TLS [2a02:f680:e0:1210::2123]:5061;branch=z9hG4bKZ2359mFaFv98p;rport=55317<br>   From: "Extension 1000" <sip:1000@[2a02:f680:e0:1210::2123]>;tag=y912pHDgNp3QF<br>   To: <sip:1000@[2a02:7b43:1eb0:eb21::2]:5061>;tag=pNyNt1y311K1F<br>   Call-ID: 6b3983f9-e0f1-1236-0d9d-525400af4b7f<br>   CSeq: 123631351 INVITE<br>   Contact: <sip:1000@[2a02:7b43:1eb0:eb21::2]:5061;transport=udp><br>   User-Agent: FreeSWITCH-mod_sofia/1.6.19+git~20171120T163416Z~b1b21d0695~64bit<br>   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY<br>   Supported: timer, path, replaces<br>   Allow-Events: talk, hold, conference, refer<br>   Content-Type: application/sdp<br>   Content-Disposition: session<br>   Content-Length: 339<br>   X-FS-Display-Name: Outbound Call<br>   X-FS-Display-Number: sip:1000%@[2a02:7b43:1eb0:eb21::2]<br>   X-FS-Support: update_display,send_info<br>   <br>   v=0<br>   o=FreeSWITCH 1527902766 1527902767 IN IP6 2a02:7b43:1eb0:eb21::2<br>   s=FreeSWITCH<br>   c=IN IP6 2a02:7b43:1eb0:eb21::2<br>   t=0 0<br>   m=audio 32068 RTP/SAVP 8 101<br>   a=rtpmap:8 PCMA/8000<br>   a=rtpmap:101 telephone-event/8000<br>   a=fmtp:101 0-16<br>   a=ptime:20<br>   a=crypto:1 AEAD_AES_256_GCM_8 inline:LshmymiWylaGtFqTrEo3mLmx5sVN0Th32k7FSPcjicE4sDva+ZM4tlP2gck<br>   ------------------------------------------------------------------------<br>recv 1184 bytes from tls/[2a02:7b43:1eb0:eb21::2]:5061 at 13:21:01.905406:<br>   ------------------------------------------------------------------------<br>   SIP/2.0 200 OK<br>   Via: SIP/2.0/TLS [2a02:f680:e0:1210::2123]:5061;branch=z9hG4bKZ2359mFaFv98p;rport=55317<br>   From: "Extension 1000" <sip:1000@[2a02:f680:e0:1210::2123]>;tag=y912pHDgNp3QF<br>   To: <sip:1000@[2a02:7b43:1eb0:eb21::2]:5061>;tag=pNyNt1y311K1F<br>   Call-ID: 6b3983f9-e0f1-1236-0d9d-525400af4b7f<br>   CSeq: 123631351 INVITE<br>   Contact: <sip:1000@[2a02:7b43:1eb0:eb21::2]:5061;transport=udp><br>   User-Agent: FreeSWITCH-mod_sofia/1.6.19+git~20171120T163416Z~b1b21d0695~64bit<br>   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY<br>   Supported: timer, path, replaces<br>   Allow-Events: talk, hold, conference, refer<br>   Content-Type: application/sdp<br>   Content-Disposition: session<br>   Content-Length: 339<br>   X-FS-Display-Name: Outbound Call<br>   X-FS-Display-Number: sip:1000%@[2a02:7b43:1eb0:eb21::2]<br>   X-FS-Support: update_display,send_info<br>   <br>   v=0<br>   o=FreeSWITCH 1527902766 1527902767 IN IP6 2a02:7b43:1eb0:eb21::2<br>   s=FreeSWITCH<br>   c=IN IP6 2a02:7b43:1eb0:eb21::2<br>   t=0 0<br>   m=audio 32068 RTP/SAVP 8 101<br>   a=rtpmap:8 PCMA/8000<br>   a=rtpmap:101 telephone-event/8000<br>   a=fmtp:101 0-16<br>   a=ptime:20<br>   a=crypto:1 AEAD_AES_256_GCM_8 inline:LshmymiWylaGtFqTrEo3mLmx5sVN0Th32k7FSPcjicE4sDva+ZM4tlP2gck<br>   ------------------------------------------------------------------------<br>recv 1184 bytes from tls/[2a02:7b43:1eb0:eb21::2]:5061 at 13:21:05.905437:<br>   ------------------------------------------------------------------------<br>   SIP/2.0 200 OK<br>   Via: SIP/2.0/TLS [2a02:f680:e0:1210::2123]:5061;branch=z9hG4bKZ2359mFaFv98p;rport=55317<br>   From: "Extension 1000" <sip:1000@[2a02:f680:e0:1210::2123]>;tag=y912pHDgNp3QF<br>   To: <sip:1000@[2a02:7b43:1eb0:eb21::2]:5061>;tag=pNyNt1y311K1F<br>   Call-ID: 6b3983f9-e0f1-1236-0d9d-525400af4b7f<br>   CSeq: 123631351 INVITE<br>   Contact: <sip:1000@[2a02:7b43:1eb0:eb21::2]:5061;transport=udp><br>   User-Agent: FreeSWITCH-mod_sofia/1.6.19+git~20171120T163416Z~b1b21d0695~64bit<br>   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY<br>   Supported: timer, path, replaces<br>   Allow-Events: talk, hold, conference, refer<br>   Content-Type: application/sdp<br>   Content-Disposition: session<br>   Content-Length: 339<br>   X-FS-Display-Name: Outbound Call<br>   X-FS-Display-Number: sip:1000%@[2a02:7b43:1eb0:eb21::2]<br>   X-FS-Support: update_display,send_info<br>   <br>   v=0<br>   o=FreeSWITCH 1527902766 1527902767 IN IP6 2a02:7b43:1eb0:eb21::2<br>   s=FreeSWITCH<br>   c=IN IP6 2a02:7b43:1eb0:eb21::2<br>   t=0 0<br>   m=audio 32068 RTP/SAVP 8 101<br>   a=rtpmap:8 PCMA/8000<br>   a=rtpmap:101 telephone-event/8000<br>   a=fmtp:101 0-16<br>   a=ptime:20<br>   a=crypto:1 AEAD_AES_256_GCM_8 inline:LshmymiWylaGtFqTrEo3mLmx5sVN0Th32k7FSPcjicE4sDva+ZM4tlP2gck<br><br>So, Freeswitch-1 hangup:<br>2018-06-02 13:21:06.372001 [DEBUG] sofia.c:7084 Channel sofia/external-ipv6/1000@[2a02:f680:e0:1210::2123] entering state [terminating][0]<br>2018-06-02 13:21:06.372001 [NOTICE] sofia.c:8273 Hangup sofia/external-ipv6/1000@[2a02:f680:e0:1210::2123] [CS_EXECUTE] [NORMAL_UNSPECIFIED]<br></div>