Fred -
grep -i error freeswitch.log yields the following:
2017-10-13 13:21:18.261991 [ERR] sofia.c:3146 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp) ATTEMPT 1 (RETRY IN 5 SEC)
2017-10-13 13:21:18.267990 [ERR] sofia.c:3146 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp) ATTEMPT 1 (RETRY IN 5 SEC)
2017-10-13 13:21:19.705904 [DEBUG] mod_verto.c:4167 Bind Error!
2017-10-13 13:21:19.705941 [DEBUG] mod_verto.c:4167 Bind Error!
2017-10-13 13:21:19.705957 [DEBUG] mod_verto.c:4339 Client Socket Error! No Listeners!
2017-10-13 13:21:20.216835 [NOTICE] switch_loadable_module.c:162 Adding Endpoint 'error'
2017-10-13 13:21:23.255507 [ERR] sofia.c:3146 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp) ATTEMPT 2 (RETRY IN 5 SEC)
2017-10-13 13:21:23.255507 [ERR] sofia.c:3146 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp) ATTEMPT 2 (RETRY IN 5 SEC)
2017-10-13 13:21:28.255507 [ERR] sofia.c:3146 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp) ATTEMPT 3 (RETRY IN 5 SEC)
2017-10-13 13:21:28.255507 [ERR] sofia.c:3156 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp)
2017-10-13 13:21:28.255507 [ERR] sofia.c:3146 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp) ATTEMPT 3 (RETRY IN 5 SEC)
2017-10-13 13:21:28.255507 [ERR] sofia.c:3156 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp)
2017-10-13 13:25:41.615507 [NOTICE] switch_event.c:457 Subclass reservation deleted for mod_sofia.c:sofia::error
2017-10-13 13:25:46.184531 [ERR] sofia.c:3146 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp) ATTEMPT 1 (RETRY IN 5 SEC)
2017-10-13 13:25:46.187836 [ERR] sofia.c:3146 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp) ATTEMPT 1 (RETRY IN 5 SEC)
2017-10-13 13:25:47.675406 [DEBUG] mod_verto.c:4167 Bind Error!
2017-10-13 13:25:47.675446 [DEBUG] mod_verto.c:4167 Bind Error!
2017-10-13 13:25:47.675456 [DEBUG] mod_verto.c:4339 Client Socket Error! No Listeners!
2017-10-13 13:25:48.188245 [NOTICE] switch_loadable_module.c:162 Adding Endpoint 'error'
2017-10-13 13:25:51.168792 [ERR] sofia.c:3146 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp) ATTEMPT 2 (RETRY IN 5 SEC)
2017-10-13 13:25:51.168792 [ERR] sofia.c:3146 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp) ATTEMPT 2 (RETRY IN 5 SEC)
2017-10-13 13:25:56.168794 [ERR] sofia.c:3146 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp) ATTEMPT 3 (RETRY IN 5 SEC)
2017-10-13 13:25:56.168794 [ERR] sofia.c:3156 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp)
2017-10-13 13:25:56.168794 [ERR] sofia.c:3146 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp) ATTEMPT 3 (RETRY IN 5 SEC)
2017-10-13 13:25:56.168794 [ERR] sofia.c:3156 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp)
2017-10-13 13:34:31.828788 [NOTICE] switch_event.c:457 Subclass reservation deleted for mod_sofia.c:sofia::error
2017-10-13 13:34:36.267503 [ERR] sofia.c:3146 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp) ATTEMPT 1 (RETRY IN 5 SEC)
2017-10-13 13:34:36.269214 [ERR] sofia.c:3146 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp) ATTEMPT 1 (RETRY IN 5 SEC)
2017-10-13 13:34:37.756088 [DEBUG] mod_verto.c:4167 Bind Error!
2017-10-13 13:34:37.756137 [DEBUG] mod_verto.c:4167 Bind Error!
2017-10-13 13:34:37.756151 [DEBUG] mod_verto.c:4339 Client Socket Error! No Listeners!
2017-10-13 13:34:38.268703 [NOTICE] switch_loadable_module.c:162 Adding Endpoint 'error'
2017-10-13 13:34:41.266356 [ERR] sofia.c:3146 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp) ATTEMPT 2 (RETRY IN 5 SEC)
2017-10-13 13:34:41.266356 [ERR] sofia.c:3146 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp) ATTEMPT 2 (RETRY IN 5 SEC)
2017-10-13 13:34:46.266358 [ERR] sofia.c:3146 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp) ATTEMPT 3 (RETRY IN 5 SEC)
2017-10-13 13:34:46.266358 [ERR] sofia.c:3156 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp)
2017-10-13 13:34:46.266358 [ERR] sofia.c:3146 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp) ATTEMPT 3 (RETRY IN 5 SEC)
2017-10-13 13:34:46.266358 [ERR] sofia.c:3156 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp)
2017-10-13 13:41:06.006349 [NOTICE] switch_event.c:457 Subclass reservation deleted for mod_sofia.c:sofia::error
2017-10-13 13:45:08.200697 [ERR] sofia.c:3146 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp) ATTEMPT 1 (RETRY IN 5 SEC)
2017-10-13 13:45:08.204300 [ERR] sofia.c:3146 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp) ATTEMPT 1 (RETRY IN 5 SEC)
2017-10-13 13:45:09.691717 [DEBUG] mod_verto.c:4167 Bind Error!
2017-10-13 13:45:09.691804 [DEBUG] mod_verto.c:4167 Bind Error!
2017-10-13 13:45:09.691828 [DEBUG] mod_verto.c:4339 Client Socket Error! No Listeners!
2017-10-13 13:45:10.204387 [NOTICE] switch_loadable_module.c:162 Adding Endpoint 'error'
2017-10-13 13:45:13.186854 [ERR] sofia.c:3146 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp) ATTEMPT 2 (RETRY IN 5 SEC)
2017-10-13 13:45:13.186854 [ERR] sofia.c:3146 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp) ATTEMPT 2 (RETRY IN 5 SEC)
2017-10-13 13:45:18.186854 [ERR] sofia.c:3146 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp) ATTEMPT 3 (RETRY IN 5 SEC)
2017-10-13 13:45:18.186854 [ERR] sofia.c:3156 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp)
2017-10-13 13:45:18.186854 [ERR] sofia.c:3146 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp) ATTEMPT 3 (RETRY IN 5 SEC)
2017-10-13 13:45:18.186854 [ERR] sofia.c:3156 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp)
2017-10-13 14:01:39.786854 [NOTICE] switch_event.c:457 Subclass reservation deleted for mod_sofia.c:sofia::error
2017-10-13 14:01:44.256357 [ERR] sofia.c:3146 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp) ATTEMPT 1 (RETRY IN 5 SEC)
2017-10-13 14:01:44.258146 [ERR] sofia.c:3146 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp) ATTEMPT 1 (RETRY IN 5 SEC)
2017-10-13 14:01:45.743601 [DEBUG] mod_verto.c:4167 Bind Error!
2017-10-13 14:01:45.743665 [DEBUG] mod_verto.c:4167 Bind Error!
2017-10-13 14:01:45.743680 [DEBUG] mod_verto.c:4339 Client Socket Error! No Listeners!
2017-10-13 14:01:46.255907 [NOTICE] switch_loadable_module.c:162 Adding Endpoint 'error'
2017-10-13 14:01:49.251676 [ERR] sofia.c:3146 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp) ATTEMPT 2 (RETRY IN 5 SEC)
2017-10-13 14:01:49.251676 [ERR] sofia.c:3146 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp) ATTEMPT 2 (RETRY IN 5 SEC)
2017-10-13 14:01:54.251671 [ERR] sofia.c:3146 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp) ATTEMPT 3 (RETRY IN 5 SEC)
2017-10-13 14:01:54.251671 [ERR] sofia.c:3156 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp)
2017-10-13 14:01:54.251671 [ERR] sofia.c:3146 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp) ATTEMPT 3 (RETRY IN 5 SEC)
2017-10-13 14:01:54.251671 [ERR] sofia.c:3156 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp)
2017-10-19 14:42:22.811668 [NOTICE] switch_event.c:457 Subclass reservation deleted for mod_sofia.c:sofia::error
2017-10-19 14:45:58.463803 [ERR] sofia.c:3146 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp) ATTEMPT 1 (RETRY IN 5 SEC)
2017-10-19 14:45:58.465900 [ERR] sofia.c:3146 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp) ATTEMPT 1 (RETRY IN 5 SEC)
2017-10-19 14:45:59.953546 [DEBUG] mod_verto.c:4167 Bind Error!
2017-10-19 14:45:59.953618 [DEBUG] mod_verto.c:4167 Bind Error!
2017-10-19 14:45:59.953633 [DEBUG] mod_verto.c:4339 Client Socket Error! No Listeners!
2017-10-19 14:46:00.466070 [NOTICE] switch_loadable_module.c:162 Adding Endpoint 'error'
2017-10-19 14:46:03.444498 [ERR] sofia.c:3146 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp) ATTEMPT 2 (RETRY IN 5 SEC)
2017-10-19 14:46:03.464493 [ERR] sofia.c:3146 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp) ATTEMPT 2 (RETRY IN 5 SEC)
2017-10-19 14:46:08.464496 [ERR] sofia.c:3146 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp) ATTEMPT 3 (RETRY IN 5 SEC)
2017-10-19 14:46:08.464496 [ERR] sofia.c:3156 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp)
2017-10-19 14:46:08.464496 [ERR] sofia.c:3146 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp) ATTEMPT 3 (RETRY IN 5 SEC)
2017-10-19 14:46:08.464496 [ERR] sofia.c:3156 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp)
2017-10-19 14:51:46.024497 [NOTICE] switch_event.c:457 Subclass reservation deleted for mod_sofia.c:sofia::error
2017-10-19 14:51:50.535045 [ERR] sofia.c:3146 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp) ATTEMPT 1 (RETRY IN 5 SEC)
2017-10-19 14:51:50.538292 [ERR] sofia.c:3146 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp) ATTEMPT 1 (RETRY IN 5 SEC)
2017-10-19 14:51:52.032930 [DEBUG] mod_verto.c:4167 Bind Error!
2017-10-19 14:51:52.032968 [DEBUG] mod_verto.c:4167 Bind Error!
2017-10-19 14:51:52.032978 [DEBUG] mod_verto.c:4339 Client Socket Error! No Listeners!
2017-10-19 14:51:52.548153 [NOTICE] switch_loadable_module.c:162 Adding Endpoint 'error'
2017-10-19 14:51:55.544137 [ERR] sofia.c:3146 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp) ATTEMPT 2 (RETRY IN 5 SEC)
2017-10-19 14:51:55.544137 [ERR] sofia.c:3146 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp) ATTEMPT 2 (RETRY IN 5 SEC)
2017-10-19 14:52:00.564143 [ERR] sofia.c:3146 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp) ATTEMPT 3 (RETRY IN 5 SEC)
2017-10-19 14:52:00.564143 [ERR] sofia.c:3156 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp)
2017-10-19 14:52:00.584138 [ERR] sofia.c:3146 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp) ATTEMPT 3 (RETRY IN 5 SEC)
2017-10-19 14:52:00.584138 [ERR] sofia.c:3156 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp)
2017-10-19 16:34:30.924134 [NOTICE] switch_event.c:457 Subclass reservation deleted for mod_sofia.c:sofia::error
2017-10-19 16:34:34.296615 [ERR] sofia.c:3146 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp) ATTEMPT 1 (RETRY IN 5 SEC)
2017-10-19 16:34:34.300070 [ERR] sofia.c:3146 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp) ATTEMPT 1 (RETRY IN 5 SEC)
2017-10-19 16:34:35.804802 [DEBUG] mod_verto.c:4167 Bind Error!
2017-10-19 16:34:35.804865 [DEBUG] mod_verto.c:4167 Bind Error!
2017-10-19 16:34:35.804874 [DEBUG] mod_verto.c:4339 Client Socket Error! No Listeners!
2017-10-19 16:34:35.814011 [NOTICE] switch_loadable_module.c:162 Adding Endpoint 'error'
2017-10-19 16:34:39.310790 [ERR] sofia.c:3146 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp) ATTEMPT 2 (RETRY IN 5 SEC)
2017-10-19 16:34:39.310790 [ERR] sofia.c:3146 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp) ATTEMPT 2 (RETRY IN 5 SEC)
2017-10-19 16:34:44.330791 [ERR] sofia.c:3146 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp) ATTEMPT 3 (RETRY IN 5 SEC)
2017-10-19 16:34:44.330791 [ERR] sofia.c:3156 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp)
2017-10-19 16:34:44.330791 [ERR] sofia.c:3146 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp) ATTEMPT 3 (RETRY IN 5 SEC)
2017-10-19 16:34:44.330791 [ERR] sofia.c:3156 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp)
2017-10-19 16:39:15.170788 [NOTICE] switch_event.c:457 Subclass reservation deleted for mod_sofia.c:sofia::error
2017-10-19 16:39:19.527821 [ERR] sofia.c:3146 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp) ATTEMPT 1 (RETRY IN 5 SEC)
2017-10-19 16:39:19.528094 [ERR] sofia.c:3146 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp) ATTEMPT 1 (RETRY IN 5 SEC)
2017-10-19 16:39:21.020992 [DEBUG] mod_verto.c:4167 Bind Error!
2017-10-19 16:39:21.021031 [DEBUG] mod_verto.c:4167 Bind Error!
2017-10-19 16:39:21.021042 [DEBUG] mod_verto.c:4339 Client Socket Error! No Listeners!
2017-10-19 16:39:21.535132 [NOTICE] switch_loadable_module.c:162 Adding Endpoint 'error'
2017-10-19 16:39:24.552799 [ERR] sofia.c:3146 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp) ATTEMPT 2 (RETRY IN 5 SEC)
2017-10-19 16:39:24.552799 [ERR] sofia.c:3146 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp) ATTEMPT 2 (RETRY IN 5 SEC)
2017-10-19 16:39:29.572793 [ERR] sofia.c:3146 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp) ATTEMPT 3 (RETRY IN 5 SEC)
2017-10-19 16:39:29.572793 [ERR] sofia.c:3156 Error Creating SIP UA for profile: external-ipv6 (sip:mod_sofia@[::1]:5060;transport=udp,tcp)
2017-10-19 16:39:29.572793 [ERR] sofia.c:3146 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp) ATTEMPT 3 (RETRY IN 5 SEC)
2017-10-19 16:39:29.572793 [ERR] sofia.c:3156 Error Creating SIP UA for profile: internal-ipv6 (sip:mod_sofia@[::1]:5090;transport=udp,tcp)