SIP Trunk setting problem

I am setting the SIP trunk and found the Local Username in General Configurations must input. After I input abc then it will show as below:

Endpoint: abc Not in use 0 of inf
Aor: abc 2
Contact: abc/sip:abc@192.168.2.20:5060 f1ec4fac5a Avail 2.187
Transport: transport-udp-3baa003c2d301de89c68 udp 0 0 0.0.0.0:5060

Is it possible not show abc@ and like below? Can tell me how to do it?

Endpoint: abc Not in use 0 of inf
Aor: abc 2
Contact: abc/sip:192.168.2.20:5060 f1ec4fac5a Avail 2.187
Transport: transport-udp-3baa003c2d301de89c68 udp 0 0 0.0.0.0:5060

Does this create an issue with your VoIP provider?

Can you share the instructions given by your VoIP provider?

P.D.: Hide any sensitive data!!!