In the Channels section, you can assign the following permissions to the custom role:

PowerPermissionTopic Link
Strategies

No Access

Read Only

Full Access

Strategies
Phone Numbers

No Access

Read Only

Full Access

Phone Numbers
Contact Timings

No Access

Read Only

Full Access

Contact Timings
CID Packages

No Access

Read Only

CID Packages
Voice Profiles

No Access

Read Only

Full Access

Voice Profiles
Email Channels

No Access

Read Only

Full Access

Email Channels
Contact Flows

No Access

Read Only

Full Access

Contact Flows
SMS Channels

No Access

Read Only

Full Access

SMS Channels
 Web Widgets

No Access

Read Only

Full Access

Web Widgets
Phrases

No Access

Read Only

Full Access

Phrases
Messages

No Access

Read Only

Full Access

Messages