The Cisco VoIP system is composed of Cisco IP phones, a Cisco Call Manager, a Cisco Unity voicemail server and a Cisco voice gateway router to connect the VoIP system to the public switched telephone network (PSTN). The goal of the VoIP system is to provide telephony services over an IP network which is also used to interconnect the distinct elements of the VoIP system. The major security features that are provided by the Cisco VoIP system are:
- The restriction of IP phone users access to certain telephone numbers.
- Identification and authentication of users who wish to access Cisco's VoIP system voicemail services.
- The management of IP phones.
- The provision of systems traces through alarms and call information.
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