The telephone system is a central telephone communication system for the hotel, which is managed by the central server. This system has many advantages compared to older analog systems, some of which are presented in the following:

• Imposing much lower maintenance costs for VoIP networks than that of current telecommunications network
• Providing higher speed in establishing communication because of using switches
• Combining sound, data, and image functionality
• Requiring less bandwidth
• Using open standards such as H:323 and SIP
• Controlling communication and contact via internal server
• Presenting better extensibility
• Having faster implementation
• Integrability with other systems
• Allowing the integration of VoIP calls and city lines