the Global administrator is faisal@7v840c.onmicrosoft.com and this faisal.ahmad@abcsbc.com is the user created for the domain abcsbc.com.
The global account is the development test account with the Teams license without calling. But with this license you will be able to test the Teams trunking.
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(): ---]]