here you go for the sipexer test below and it's successful but in the sngrep I see the options packet for alice without this command on udp when executing the default command for sipexer.
./sipexer -options -contact-uri "sip:abcsbc.com:5061;transport=tls" -fd "abcsbc.com" -td "sip.pstnhub.microsoft.com;transport=tls" -tls-insecure -tls-certificate "/etc/letsencrypt/live/abcsbc.com/fullchain.pem" -tls-key "/etc/letsencrypt/live/abcsbc.com/privkey.pem" -xh "Max-Forwards: 70" -ua "Kamailio" "sip:sip.pstnhub.microsoft.com:5061;transport=tls"
[info] [sipexer.go:1581] main.SIPExerDialogLoop(): local socket address: 172.31.19.8:51882 (tls) [info] [sipexer.go:1582] main.SIPExerDialogLoop(): local via address: 172.31.19.8:51882 [info] [sipexer.go:1583] main.SIPExerDialogLoop(): sending to tls 52.114.148.0:5061: [[--- OPTIONS sip:sip.pstnhub.microsoft.com:5061;transport=tls SIP/2.0 Via: SIP/2.0/TLS 172.31.19.8:51882;rport;branch=z9hG4bKSG.c031ebff-3cd4-4eb3-8c71-f82b3bc41b30 From: sip:alice@abcsbc.com;tag=5134186d-6804-419e-8abc-99cfe607e3b1 To: sip:bob@sip.pstnhub.microsoft.com;transport=tls Call-ID: 73f563c9-6647-4402-be59-361e4a1d40c0 CSeq: 44075 OPTIONS Date: Mon, 18 Dec 2023 22:07:12 UTC Contact: sip:abcsbc.com:5061;transport=tls User-Agent: Kamailio Max-Forwards: 10 Content-Length: 0 Max-Forwards: 70
[info] [sipexer.go:1585] main.SIPExerDialogLoop(): ---]]
[info] [sipexer.go:1636] main.SIPExerDialogLoop(): response-received: from=52.114.148.0:5061 bytes=441 data=[[--- SIP/2.0 200 OK FROM: sip:alice@abcsbc.com;tag=5134186d-6804-419e-8abc-99cfe607e3b1 TO: sip:bob@sip.pstnhub.microsoft.com;transport=tls CSEQ: 44075 OPTIONS CALL-ID: 73f563c9-6647-4402-be59-361e4a1d40c0 VIA: SIP/2.0/TLS 172.31.19.8:51882;branch=z9hG4bKSG.c031ebff-3cd4-4eb3-8c71-f82b3bc41b30;rport CONTENT-LENGTH: 0 ALLOW: INVITE,ACK,OPTIONS,CANCEL,BYE,NOTIFY SERVER: Microsoft.PSTNHub.SIPProxy v.2023.12.11.2 i.USWE2.3
[info] [sipexer.go:1638] main.SIPExerDialogLoop(): ---]]