Practical VoIP Using VOCAL

Policy Servers

The Policy server is the key component used to achieve Quality of Service (QoS). Service providers typically will ensure QoS only if authorizations and payments are guaranteed by either a third party or through a direct peer-to-peer agreement. The Policy server administers admission control for QoS requests and provides the Internetwork Marshal (policy client) with the information necessary to enforce the admitted QoS requests. The Policy server outsources the authorization, authentication, and accounting (AAA) requests to a third-party clearinghouse, which then acts as a trusted broker for a large number of network providers. Quality of Service is discussed in detail in Chapter 18.

Table 6-22 shows the provisioning tasks that can be performed with the Policy servers.

Table 6-22. Policy server tasks

Task	Comments
Adding a Policy server group	Policy server groups are the first sublevel below pdpServers on the directory tree. There is normally only one Policy server on a system.
Adding a Policy server	Policy servers are the second sublevel below pdpServers on the directory tree. There is normally only one Policy server on a system.
Editing a Policy server	Select a server, edit the fields, and then click OK. Table 6-23 describes the fields.
Deleting Policy servers	Select a server and click Delete.

Figure 6-9 shows the Policy server’s data entry fields.

Figure 6-9. Policy server data entry screen

Table 6-23 describes the fields.

Table 6-23. Policy ...