Hi @Peter Bodelier, Thanks for your quick response, Iam checking if their any other solution apart from ACL's. if we don't have better than this, could you share the solution on configuring the ACL idea i will try to implement.

It really is basic ACL implementation.

Create a field level ACL such as incident.caller_id, and add a role to it.

Be aware you need to make sure, you are not restricting it for the caller itself.
So you will probably (for caller_id) need 2 ACL's one for the 'selected users' and one for the caller himself (and maybe others depending on your implementation.

Hi @Peter Bodelier I think you misunderstand, we are masking field data not complete field here so we can able to see the field but inside the information on that particular field should not visible.

Hi @veerabhaskar do,

Can you please explain to me what the functional difference would be?

you can use Data anonymization (part of data privacy) to mask part of data based on pre defined pattern .