INS 8.2 Understand the three supplied roles

The interface names them Pengguna, Speech Admin and Admin.

Peranan	Described as	Kebenaran held	Delete offered
Pengguna	"Standard tenant user."	9, beginning View Request Metadata and View Panggilan Gambaran Keseluruhan	Yes
Speech Admin	"Universal administrator."	76, beginning Create Telcos and View Telcos	No
Admin	"Penyewa administrator."	46, beginning Create Penyewas and View Penyewas	No

Speech Admin is by far the broadest, and it reaches above your tenant. It holds 76 permissions against Admin's 46 and Pengguna's 9, and the first two are Create Telcos and View Telcos. A Telco sits above a tenant in the platform hierarchy: a Telecom is assigned the platform and then creates tenants beneath it. So this role's scope extends past your own organisation. Assign Speech Admin only where that is genuinely intended, and confirm with support@ncsapp.com exactly what it reaches outside your tenant before granting it to anyone.

The gap between the roles is very wide. There is nothing between a 9-permission Pengguna and a 46-permission Admin. If you need a supervisor who can read call content but not administer the tenant, build a custom role (INS 8.3) rather than reaching for Admin.

Delete is not offered on every role. It is offered on Pengguna but not on Speech Admin or Admin, so the two administrative roles cannot be removed from this page. That is a deliberate protection, not a permissions problem with your account.