Panasonic KX-TDA100D Hybrid IP PBX System is a comprehensive solution tailored to effectively meet your communication needs today and in the future. The universal card slots desinged allows foreasy expansion by simply adding the required interface cards such as CO trunk card, extension card, ISDN PRI card, IP trunk / extension card etc. Unique Features:- Caller ID Trunk Card - The new CO trunk card (KX-TDA1180) is equipped FSK/DTMF caller ID feature. User can identified caller's phone number before answered incoming call. Caller ID and Message Waiting Light Single Line Extension Card - The new single line extension card KX-TDA1176 (16 ports) and KX-TDA1178 (24 ports) is equipped with FSK caller ID and message waiting light features. By connecting caller ID single line with message waiting light, user can identifiedcaller's phone number before answered incoming call. The message waiting light will turn ON when there is a waiting message. Universal Card Slots - The system is equipped with 7 universal card slots. It allows user to tailor his PABX system by inserting the required interface cards. VoIP - The PBX can connect to another PBX using an IP-GW card. It is an ideal solution for site-to site communications between multi-site offices. IP Extensions - This PBX supports connection of IP proprietary telephones over a Local Area Network (LAN) or Virtual Private Network (VPN). It is an ideal solution for branch office that required few extensions connect over the existing VPN. Walking COS - This feature allows user to make outgoing call from any restricted extension after enter his personal PIN. The call will then be charged to the caller's pre-assigned extension.