ISDN PRI T1/E1
A Single ISDN PRI T1 provides an equivalent of 23 phone lines. It is a digital phone line with a T1 having 23 'B' channels and 1 'D' channel for signaling In North America. It is a purely digital transmission, as opposed to the analog transmission of plain old telephone service (POTS). It offers extremely good voice quality and is essential for predictive dialing unless you're a VoIP termination. If you are running an Inbound call center with multiple clients, a PRI with a bank of DID numbers will adequately serve your ACD routing. NFAS allows two or more PRIs to be controlled by a single D channel. D-channel backup allows you to have a second D channel in case the primary fails.
Voice over IP Termination provides your phones systems with the required connectivity to the telephone network for making and receiving long distance and local calls. The Provider can be physically located anywhere and your phone systems will connect to the VoIP Provider through the Internet. One of the most attractive advantages of VoIP is the pricing. The VoIP Termination Provider will not deal with your bandwidth requirements for the voice calls. It is important to make sure that your calls will have sufficient bandwidth. Also, if the calls have to travel considerably through the Internet, the delay can cause degradation of the voice quality. There is a new trend emerging where Bonded T1 and VoIP Terminations are provided by ISP (Internet Service Provider). This option is attractive because it eliminates both bandwidth and lag provided your ISP has the required capacity and termination facilities. IP-PBX like Asterisk is ideally suited to this emerging trend as it can accommodate conventional TDM phone systems as well as VoIP.