Business Phone Line Options

By: John Shepler

One thing every business, large or small, needs is at least one telephone line. Phone lines may seem pretty mundane, but you may have more options than you think. Are you sure that you have the right phone line for your business?

Plain Old Telephone Service
The historical phone line that we’re all familiar with is the analog phone line, also called POTS for Plain Old Telephone Service. It’s that vanilla.

POTS lines are as simple as they come. They consist of a single twisted copper pair that runs from a standard RJ-11 phone jack on your wall all the way back to the telephone company central office. The phone conversation is carried by a varying current in the wires.

What you may not realize is that POTS is a self-contained phone system. Phones were traditionally made of passive electrical components. They got their power right off the phone line… and still can. The value of this is that even if the electrical power goes off at your location, you still have phone service.

What’s happened lately, however, is that even single line phones have gone electronic and require AC power supplies and/or batteries to power the circuitry. This is especially true of cordless phone systems with multiple handsets. You can still get dial tone during a power outage, but you need to have a backup battery supply to operate the phone, not the line.

Multiple LInes
You are not stuck with just a single POTS line. You can have as many as you want. Mind you, there is no economy of scale. There is a fixed price for each line whether you have one phone per line or share the outside lines using a Key Telephone System or PBX.

Wireless as an Option
Can you get rid of the telephone line completely? That’s what cellular phone service is all about. No more “landline”. Everything is done with cell towers instead of wires. Wireless can work just fine for independent professionals who are always out of the office anyway. With a data plan you can have both Internet and voice telephony on the same device. You can enhance your mobile setup with an incoming toll free number, fax transmission and reception, and international dial-around calling. Shared plans can support a small office as well as a single user. Operations larger than that will still need wired landlines.

Moving up to Trunks
A telephone trunk is multiple phone lines coming in on a single cable. There used to be analog trunks, but that technology has all gone digital. The most popular trunks are T1, ISDN PRI and SIP.

T1 lines were devised as replacements for multiple analog POTS lines. Instead of separate wires, T1 lines are multiplexed to divvy up the available bandwidth into 24 independent channels. Each channel can be thought of as a separate phone line.

What if you already have a dozen phones and want to replace all those separate phone lines with a single T1 line? Chances are that you’ll get the same or better service at a lower monthly cost. A box called a “channel bank” handles the conversion between T1 channels and analog lines. Just plug your phones in like you always have.

T1 vs ISDN PRI
ISDN PRI or Primary Rate Interface is a variation on the T1 line. It uses the same channelization scheme, but dedicates one channel to dialing and switching for all the others. That means you have a maximum of 23 outside lines available on a PRI trunk. The tradeoff is that your phone calls will switch faster on ISDN PRI. That’s important for call centers and others who need highly efficient telephone operations.

Most PBX systems now have the interface circuitry for T1 and ISDN PRI already built-in. You simply plug in the trunk line and the system handles all of the necessary conversions.

SIP Trunks
Many, many companies are considering switching to VoIP technology or have already made the move. SIP trunks are the natural complement to VoIP phone systems. Their advantage is that they use the same protocol, SIP, as the phone themselves. Remember that VoIP or SIP phones connect directly to an Ethernet LAN, usually shared with computers, printers and other network devices. The SIP trunk extends the network so that it also connects to the VoIP service provider.

Like T1 and ISDN PRI, SIP trunks support multiple simultaneous telephone conversations. The difference is that these conversations consist of packet streams all combined on one line instead of breaking the line into separate channels.

Another advantage of SIP trunks is that they can carry Internet traffic as well as phone calls. After all, everything is in packet format. What’s important is that the trunk be setup to prioritize telephone traffic over data traffic to ensure voice quality. This is called Class of Service or Quality of Service.

What phone line is best for your business? One way to find out quickly is to get multiple competitive quotes for everything from POTS through SIP Trunking as business phone line options.

Choose Your Trunk, Choose Your Handoff

By: John Shepler

The telephone system isn’t what it used to be. Mostly that’s good. Technology has given us wireless mobile smartphones, enterprise VoIP, cloud hosted services and sophisticated call center operations. Many companies, though, can’t afford to shuck their considerable infrastructure investment in order to gain the advantages of the latest advancements. Is there any way to mash up the old and the new and have it work?

Indeed, there is. The magic is in something called a “handoff”. This is the interface between your telecom lines and your equipment. Let’s take a look at what type of handoffs are available to keep your phone system up to date.

In the beginning, “Ma Bell” offered one type of handoff. It’s the venerable analog POTS (Plain Old Telephone Service) line that is still popular today. Every phone was an analog phone and every line was an analog line. The handoff was in the form of a single twisted pair of copper wires. All the switching was handled by the public telephone system.

This type of connection still works well for businesses that need only a single telephone line. The phone plugs into a jack on the wall that connects to the telco POTS line. It’s the ultimate in simplicity. This arrangement supports both single wired handsets and the newer cordless phones. You can have multiple cordless handsets connected to a single POTS line.

A slightly more sophisticated business phone system allows multiple desk phones along with multiple outside lines. Each line is still an analog POTS line with its own phone number. It’s called a key telephone system because each phone has a button or “key” for each line. You can see the status of each line, typically 4 or 8, on the light for that line. You select the line you want by pushing the button for that line. You have to provide the switching intelligence for the system by answering the line that is ringing or selecting an unused line for calling out.

You can have as many analog phone lines as your key system will support. Since the lines are independent, there is no economy of scale with this arrangement. Two lines cost twice as much as one line, and so on. To gain a cost advantage, you need to move up to a trunk ing arrangement.

A trunk is a telecom line that supports multiple independent phone conversations. Originally, these were also analog using frequency division multiplexing. In the last 50 years, the old analog trunks have been replaced by digital trunks. T1 phone lines are a popular trunking system. Each T1 line supports up to 24 simultaneous phone calls carried on separate time multiplexed channels. The physical connection is two copper twisted pair. One is for transmit and the other is for receive.

Lets say you have a good size key telephone system with a dozen outside lines. You can provide those lines as individual POTS lines or with a single T1 line that carries all 12 phone lines with room to spare. The T1 line will likely cost less for a dozen lines. If you used all 24 channels, the cost savings would be even more dramatic. The issue you have, though, is how to connect a digital T1 line to your analog telephone system.

The answer is in a piece of interface equipment called a “channel bank.” This device converts between analog and digital signals so that both the phone system and the trunk line have the signal format and electrical characteristics they expect. As far as your phone system is concerned, the connection is exactly the same as if you had separate analog lines all the way to the phone company. This is called an analog handoff.

Another application for analog handoff is older in-house PBX (Private Branch Exchange) phone systems. A PBX is a key system with a brain. The PBX takes care of routing incoming calls and the bank of outside lines. When you dial “9” for an outside line, the PBX gives you the next available one. You don’t know or care which line it has selected. They all work the same.

Many PBX systems will accept one or more T1 lines directly. There is no need to go through the intermediate analog conversion using a channel bank. This is called a digital handoff. It may also be called a T1 CAS (Channel Associated Signaling) digital handoff or an ISDN PRI digital handoff.

ISDN PRI is a special type of T1 line that supports 23 simultaneous calls. What happened to the other channel? It’s used for signaling and switching to make the system faster and capable of slightly higher voice quality. Many PBX systems now have a connector for one or more PRI (Primary Rate Interface) trunks, as this is the most popular service for medium and larger phone systems.

Enterprise VoIP is the current technology being adopted en-masse by medium and larger companies. This replaces the analog or proprietary digital telephone wiring with network connections to the company LAN. The PBX is updated to an IP PBX that supports IP telephones. It also supports a packet switched phone line technology called SIP Trunking.

A SIP Trunk is digital, like T1 or PRI, but not separated into individual channels. Instead, the transmission protocol is Ethernet packets and a VoIP-centric switching format called SIP or Session Initiation Protocol.

An all-VoIP business telephone system would have IP phones and an IP PBX sharing the company LAN. A SIP Trunk connects the PBX to the telephone service provider. This is called a SIP handoff.

Another use of SIP Trunks is for cloud hosted VoIP services that provide the switching as well as connectivity to the public telephone network. With a cloud solution, you no longer have a PBX or IP PBX in-house.

Now, here’s where it gets interesting. You can often select your preferred phone trunk technology and specify the handoff you require. Just like T1 and PRI can be set up to provide analog handoff, SIP trunks can provide SIP, T1 digital, PRI digital, or analog handoffs. This means that your old phone system, with whatever interface it supports, can connect to modern networks and telephone trunking options. It often makes economic sense to continue using your current phone system until you can migrate to the latest technology.

Do you want to connect your current phones or phone system to the telephone service of your choice but aren’t sure how to make that connection? Find out what business telephone trunking options and pricing are available for your business location.

VoIP Trunk Service Providers

Any business with more than a few outside phone lines knows that trunk lines are the way to go. The next question is what type of trunk service to get. You might think that with a VoIP telephone system, the obvious choice is SIP Trunking. But is it? Take a closer look at what’s available and then decide.

The idea of telephone trunking originated with the phone companies back when Ma Bell ran the industry. When phones were new, a couple of wires were all you needed to connect from your location to the local phone company. Then everybody wanted a phone and businesses started installing switchboards to handle all the lines they needed. You know those old-timey photos of phone line congestion in the cities. That’s what happens when you build out one line at a time.

The mass of subscriber lines was gotten under control using multi-pair cable, often buried. But long distance lines between switching offices were another matter. The more simultaneous calls you carried, the more wires were needed. That gets expensive fast when you’re talking about dozens or hundreds of miles. Wouldn’t it be nice if one pair of wires could carry multiple conversations?

That’s the origin of the trunk line. The early systems were set up like radio stations on the dial, except over wires. Each call modulated its own carrier frequency that was spaced far enough in the spectrum from adjacent carriers so that they wouldn’t interfere. This was analog carrier telephony. The switch from analog to digital technology came with the T1 line. It’s been around for at least half a century and is still going strong.

T1 telephone trunks are divided into 24 separate channels, each transporting one two-way telephone call. All the dialing and switching is done on these channels, just as it would be on analog phone lines. You can get devices called channel banks to convert T1 to and from 24 analog phone lines at your office. The T1 line itself is two twisted pair running from your building to the nearest phone company central office.

The advantage of T1 lines as telephone trunks is that save a lot of wire and can save cost, too. There is no economy of scale when you buy your phone lines one at a time. Soon you have a dozen or two at the price of a dozen or two times the cost of one line. If you convert all those lines into a T1 telephone line (trunk), you’ll generally save money even if you only use half the capacity of the T1. If you need dozens of lines for your call center, T1 can save you a bundle.

Chances are that you won’t need a channel bank unless your phone system is completely analog. Most PBX systems have T1 ports already installed. Even the new IP PBX systems designed for VoIP telephones usually have T1 ports where you just plug in one or more T1 lines for your outside telephone service.

A closely related service that is even more popular than T1 telephone trunks is ISDN PRI. This service runs on a T1 line and is very similar to a T1 trunk. The difference is that only 23 channels are used for individual phone lines. The remaining channel is used for all the dialing, switching and data such as Caller ID. The switching is faster than with T1 telephony and most everyone wants Caller ID anyway. The port for this is called a PRI, ISDN PRI or T1 PRI an it is likely installed in your system now.

The other digital trunk option that is becoming popular thanks to VoIP is the SIP Trunk. SIP is the switching protocol used with IP telephones in a VoIP system. A SIP Trunk, which might also be carried on a T1 line, is not broken up into channels. Instead it is more like your local area network that transports Ethernet packets.

This is one of the big advantages of a SIP Trunk. It can connect directly to your network without having to convert from one protocol to another. In fact, just like your network carries both VoIP phone traffic and computer data traffic, a SIP Trunk can provide both telephone and broadband service from your service provider. This is the preferred arrangement, as it allows the provider to establish class of service controls to maintain voice quality regardless of other network traffic.

As you might suspect, an IP PBX system works well with a SIP Trunk. But SIP trunks can also be ordered with customer premises equipment that offers a T1 or ISDN PRI digital handoff or even analog phone lines.

Which type of telephone trunking service is right for your business? Compare prices, availability and options of T1, PRI and SIP Trunks to see what makes the best economic as well as technical sense for your particular situation.



Etching of phone lines in New York City circa 1890 courtesy of Wikimedia Commons.

Converting From Regular Phone Lines to T1

Business has been good. Your small office has turned into a much bigger area as more people have joined the team. You may have the physical space to be at your most productive, but your phone service is cramping your style. Either there just aren't enough lines to go around or your telecom closet is a rats nets of phone lines and channel banks, as phone lines have accumulated over the years. Plus, look at the size of that monthly phone bill. Line service alone is costs you a fortune. Isn't there a better way?

You bet there is. Analog phone service is perfect for the one person office, the two line business phone, or the small key telephone system with 4 to 6 lines on separate buttons. But once your operation is big enough to move to an in-house PBX phone system or you need both telephone service and broadband Internet access, It's time to move up to a T1 line.

What's special about T1 phone lines? T1 is a proven digital technology developed by the phone companies to carry multiple telephone calls on a single trunk line. T1 lines use the same twisted pair copper wiring as analog phone lines, but they only need two pair to transport up to 24 separate telephone conversations. Each channel of a T1 line carries a single phone call.

Think of T1 telephone service as a way to consolidate many separate outside lines into a single line that plugs right into the T1 interface on your PBX system. Most PBX and IP PBX systems come with this capability. If you have an older system, you might need a plug-in card or a separate channel bank to provide the needed interface.

So, what do you gain by upgrading to T1 phone service? If you're running a dozen or more lines, you are almost sure to save money by consolidating all of them on a T1 line. T1 prices have come down so much in recent years, that you might only need 6 to 10 lines to see a savings.

A variation of T1 service called ISDN PRI or Primary Rate Interface gives you up to 23 phone lines on a single T1 line plus the ability to have Caller ID for your phone system. You can also have your T1 channels set up as any combination of inbound, outbound, local and long distance telephone service. Need toll free numbers? Have them included with your line service.

Smaller businesses that only need 6 to 12 phone lines plus broadband Internet access will be interested in Integrated T1 service. As the name suggests, Integrated T1 uses a single T1 line to carry both traditional phone service plus Internet service. Generally, these lines are dynamic so that any bandwidth not needed for phone calls is automatically assigned to broadband speed. Integrated T1 service can be a cost savings over separate phone lines and broadband connections. Plus it is highly reliable for both telephone and Internet service.

What does it take to convert from regular phone lines to T1? Very little effort on your part. In a few minutes, you can enter an online T1 service inquiry and get pricing for your location. If you need help deciding or want to hear about all the options available, one of our expert consultants will be happy to give you a call.