Possible reasons for "SIP Cancel" during call setup failure cases

Hello Experts,

What can be possible reasons for “SIP Cancel” during call setup failure cases?
This reason is coming as call failure cause!

Is it pegged on VoLTE MO/MT few times?
If it is I think it may be a temp reason.
This cancel generally comes in where call hangs up.
I think this below picture you can refer.

In short A party the caller hangs before the B Party recieves the call so instead of BYE A party recieves cancel request followed by 487 trigger.