We are observing a high volume of Call/Transaction Does Not Exist in the cdrs and one of the customer is complaining about rejected or long idle cancelled calls. I have this sort of message alot in the sems.
root@i-07564980a5b206c26:/home/debian# systemctl status sems
● sems.service - SEMS for YETI project
Loaded: loaded (/lib/systemd/system/sems.service; enabled; preset: enabled)
Active: active (running) since Mon 2026-08-10 12:15:57 EDT; 18h ago
Docs: Yeti Switch Documentation | Yeti Switch
Main PID: 2028672 (sems)
Tasks: 185 (limit: 76139)
Memory: 6.0G
CPU: 21h 28min 5.142s
CGroup: /system.slice/sems.service
└─2028672 /usr/bin/sems -f /etc/sems/sems.conf
Aug 11 06:17:31 i-07564980a5b206c26 sems[2028672]: [#fffffffff82ab6c0] [relaySipReply, yeti:CallLeg.cpp:206] ERROR: 1-176BF5B4-6A7AF699000BB443-DE7FD6C0: Request with CSeq 118667916 not found in recvd_req for 481 reply.
Aug 11 06:17:32 i-07564980a5b206c26 sems[2028672]: [#fffffffffa9d26c0] [onReplyIn, Am100rel.cpp:130] ERROR: 100rel not supported or no positive RSeq value in (reliable) 1xx. callid: 1-316B85B1-6A7AF69900037864-FA9D26C0
Aug 11 06:17:32 i-07564980a5b206c26 sems[2028672]: [#fffffffffa9d26c0] [relaySipReply, yeti:CallLeg.cpp:206] ERROR: 1-7488E8F8-6A7AF699000359EE-DE7FD6C0: Request with CSeq 1601 not found in recvd_req for 181 reply.
Aug 11 06:17:32 i-07564980a5b206c26 sems[2028672]: [#fffffffffa9d26c0] [relaySipReply, yeti:CallLeg.cpp:206] ERROR: 1-7488E8F8-6A7AF699000359EE-DE7FD6C0: Request with CSeq 1601 not found in recvd_req for 481 reply.
Aug 11 06:17:38 i-07564980a5b206c26 sems[2028672]: [#fffffffff83ac6c0] [onReplyIn, Am100rel.cpp:130] ERROR: 100rel not supported or no positive RSeq value in (reliable) 1xx. callid: 1-7A572FB2-6A7AF6A40006F495-F83AC6C0
Aug 11 06:17:38 i-07564980a5b206c26 sems[2028672]: [#fffffffff83ac6c0] [relaySipReply, yeti:CallLeg.cpp:206] ERROR: 1-02FA3DE4-6A7AF6A40006D52E-DE6FC6C0: Request with CSeq 118667922 not found in recvd_req for 181 reply.
Aug 11 06:17:38 i-07564980a5b206c26 sems[2028672]: [#fffffffff83ac6c0] [relaySipReply, yeti:CallLeg.cpp:206] ERROR: 1-02FA3DE4-6A7AF6A40006D52E-DE6FC6C0: Request with CSeq 118667922 not found in recvd_req for 481 reply.
Aug 11 06:17:40 i-07564980a5b206c26 sems[2028672]: [#fffffffff92bb6c0] [onReplyIn, Am100rel.cpp:130] ERROR: 100rel not supported or no positive RSeq value in (reliable) 1xx. callid: 1-387390CE-6A7AF6A200025FFC-F92BB6C0
Aug 11 06:17:40 i-07564980a5b206c26 sems[2028672]: [#fffffffff92bb6c0] [relaySipReply, yeti:CallLeg.cpp:206] ERROR: 1-41EEA97F-6A7AF6A200021755-DE6FC6C0: Request with CSeq 118667921 not found in recvd_req for 181 reply.
Aug 11 06:17:40 i-07564980a5b206c26 sems[2028672]: [#fffffffff92bb6c0] [relaySipReply, yeti:CallLeg.cpp:206] ERROR: 1-41EEA97F-6A7AF6A200021755-DE6FC6C0: Request with CSeq 118667921 not found in recvd_req for 481 reply.