Analog Phone Lines/POTS
Analog lines, also referred to as POTS (Plain Old Telephone Service), support standard phones, fax machines, and modems. These are the lines typically found in your home or small office. Digital lines are found in large, corporate phone systems.
ISDN PRI/T1 Solutions
PRI – Primary Rate Interface
PRI is also known as ISDN PRI or sometime T1 PRI. ISDN stands for Integrated Services Digital Network. There are two speeds of service offered: BRI or Basic Rate Interface and PRI or Primary Rate Interface. BRI is a low capacity service intended for residential and small business applications. PRI is the high capacity service carried on T1 trunk lines between telco central offices and your location.
PRI divides a T1 digital signal into 24 channels of 64 Kbps capacity per channel. 23 of these channels can be assigned as one telephone call each, the equivalent of having 23 separate telephone lines. The 24th channel is used for signaling information and special features such as caller ID and hotel / motel information services. It is a popular service for call centers which need the ANI automatic number identification or caller ID data.
T1 service can be provided as channelized or unchannelized. In the channelized T1 version, there are 24 channels. Each channel can be a telephone call. T1 gives you 24 phone lines in place of the 23 that can be accommodated with PRI. However, since there is no separate signaling channel, the signaling information that tells when a phone is on hook or off hook is carried within each channel by using or “robbing” the least significant bit. Unfortunately, channelized T1 doesn’t provide any capability for ANI or caller ID data. You need PRI service for that.
Unchannelized T1 treats all 24 T1 line channels as one big combined channel for carrying Internet service, point to point data download or VoIP broadband phone. This service is intended to be handled by digital routers, not PBX telephone systems. There are no dedicated phone channels or signaling assigned for switched telephone service.
T1 (also referred to as DS1) is a standard for digital transmission over phone lines at 1.544 Mbps.
It is split into 24 channels of 64Kbps each. T1s are often “clear channel” and all bits are available for data as well as voice.
Each 64Kbps channel (also known as a DS0) can carry data or voice traffic, and two or more channels can be combined into one higher speed data channel. Many carriers are providing T1 solutions with the capability for voice, internet MPLS (private data) network solutions.
Long Distance/800 Service
A long distance call is a telephone call made outside a certain area, usually characterized by an area code outside of a local call area (known in the United States as a Local Access and Transport Area or LATA). Long-distance calls usually carry long-distance charges which, within certain nations, vary between phone companies and are the subject of much competition. International calls are calls made between different countries, and usually carry much higher charges
800 Service or Toll Free Service is a number that allows your customers the capability to call you from outside your local call area without incurring long distance charges.
A conference call is a telephone call in which the calling party wishes to have more than one party participate in to the audio portion of the call. The conference call may be designed to allow the called party to participate during the call, or the call may be set up so that the called party merely listens into the call and cannot speak
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