To decrease its call volume using an Experience site, NTO can use standard out-of-the-box functionality such as:
Create an FAQ Knowledge article. A Knowledge article is a document that provides information or a solution to a common issue or question. NTO can create an FAQ Knowledge article that answers the most frequently asked questions by its customers and publish it on its site.
Deploy a chatbot to address common questions. A chatbot is an automated conversational agent that can interact with customers using natural language. NTO can deploy a chatbot on its site that can answer common questions, provide information, or escalate issues to agents.
Enable Chatter Questions to encourage peer-to-self-service. Chatter Questions is a feature that allows customers to post questions on your site and get answers from other customers or experts. NTO can enable Chatter Questions on its site to encourage peer-to-self-service and reduce the need for support calls.

Criteria-Based Audiences are a feature that allows you to display different content to different audiences based on criteria such as profile, location, domain, or user. However, there are some considerations when using Criteria-Based Audiences, such as:
Components in the template header and footer sections cannot be assigned to an audience. These sections are shared across all pages in your site and can't be customized for different audiences.
Salesforce must be contacted if you need to use the domain criteria in sandbox or Developer Edition orgs. Domain criteria allow you to target audiences based on the domain name they use to access your site. However, this feature is not enabled by default in sandbox or Developer Edition orgs.
Record Type criteria cannot be assigned to a component. Record Type criteria are only available for page variations and navigation menu items.

To ensure that customers do not receive a welcome email when the site is once again active, the administrator should disable the Send welcome email checkbox for the site. This will prevent the site from sending an email to existing members when the site is activated. The administrator can disable the Send welcome email checkbox in the Administration section of Experience Builder.

To implement SAML 550 for the Experience Cloud site, the UC administrator should use the site login URL as an endpoint where SAML assertion is made. SAML 550 is a protocol that allows users to authenticate with a third-party identity provider and access Salesforce resources without entering their Salesforce credentials. The site login URL is the URL that users use to access the Experience Cloud site. By using the site login URL as an endpoint, the UC administrator can configure SAML settings to redirect users to the identity provider for authentication and then back to the Experience Cloud site.

Audience targeting allows UMS to create audiences based on user attributes, such as profile, location, or language, and display different content or components to different audiences within the same site. For example, UMS can create an audience for premium customers and show them a special offer on the navigation menu, while hiding it from other customers. Audience targeting can be applied to any component or page in Experience Builder.