ETERNITY PENX is a versatile IP-PBX platform based on universal slots architecture offering variety of trunks and extensions. ETERNITY PENX is ideal for any small to medium business with 24 to 48 users. Organization can flexibly connect FXO, GSM/3G, VoIP, ISDN BRI and T1/E1/PRI trunks and select from user extensions such as Analog Phones, Digital Key Phones, IP Extensions in any combination as per communication requirements.