The Cisco UC 540 includes 24 user licenses. These licenses enable the use of Cisco Unified IP Phones and allow users to access the IP PBX features, including voicemail. In addition, supplementary user licenses are bundled to help with deployments that need a few extra licenses. For additional licensing needs, the L-UC-PRO-8U= may be ordered. This increases the existing license count by eight. Table 5 lists the number of users supported based on the hardware/license configurations. The UC 540 also has built-in licenses for unified communications features.