Business phone numbers: records, not lines

For most of the history of the telephone a number was a line. It belonged to a pair of wires that ended in a socket in a wall, and if you wanted the number you needed the wall.

Business phone numbers are no longer tied to a line: a number is now a record of where calls should go. Those calls can land on a desk phone, a mobile, a laptop app, a queue, or a recording, in any order. The number and the service have come apart, changing what you should do with yours.

What to take away

The number and the service came apart

Once a number is separate from a line, several things become possible:

The consequence is that the number becomes the stable thing and everything else becomes replaceable. Providers, handsets, and connections come and go. The number printed on the shopfront should not. So treat the number as the asset and the rest as suppliers to it. The connection under it is one of those suppliers, and business internet covers it.

Who holds it, and who should

Every number has an account holder of record with the provider. That is the

The correct answer is the legal entity, with a role mailbox as the contact instead of one person's inbox. Its registered address must match what the provider holds. Provider records determine who can request account changes and initiate a port, subject to carrier portability rules.

Get this right before anything goes wrong. A mismatch here turns a routine port into a month of paperwork. A departed contractor who still holds the account is a genuine business risk.

Moving a number between providers is normally possible, but the process, paperwork, and time vary by number type and provider. In the United States, the FCC publishes a consumer guide on porting. Local number portability is coordinated through the Number Portability Administration Center (NPAC), administered by iconectiv; carriers use the portability system to coordinate ports and routing.

The receiving provider usually submits the port request to your current carrier. Providers may require a signed Letter of Authorization (LOA), account number and PIN, service address, and a current bill. Keep the existing service active until the port is complete, and ask providers for the expected timing and any charges before submitting the request.

Toll-free numbers sit in their own register and follow their own transfer rules.

Emergency calling on an internet-based service uses a registered address rather than the location of a wire. E911 systems use Automatic Location Identification (ALI) records to associate a number with a dispatchable address. The FCC's guide to VoIP and 911 service explains the service; confirm with your provider who submits and updates the registered location, and tell staff how to report a change.

Keep a dependency register

Your main number is your identity in more places than you think. Somewhere

in each of these, the number is stored and something depends on it:

Write this down as a register: the number, where it is used, who owns that listing, and how you would change it. It costs an hour to create and it is the difference between a controlled change and a month of missed calls when a number moves or is retired.

The register also tells you which numbers are load-bearing. A direct line that only appears in one person's signature can be retired quietly. The number on the vans cannot.

One number, several destinations

Routing is now software, and VoIP systems are where it lives.

The decisions worth making are about what a call does after it is dialled, not about which socket it reaches:

Because it is cheap to change, it gets changed casually and forgotten. Document the routing the same way you document the register, and review it when someone joins or leaves.

Where the calls land depends on the connection underneath, and each access type behaves differently: fiber internet is the steadiest of them, and a radio path the most variable.

What a number cannot do on its own

A number is a pointer. It does not make anything ring. The things it points at

need power and, if they are internet-based, a working connection.

In a power cut, a desk phone on an internet service goes silent unless something keeps it powered, while a call routed to a mobile still arrives. A cellular connection can keep an app-based phone working when the wired line is down. Build that into the routing rather than discovering it.

Emergency calls also behave differently on internet-based phone service than on a traditional line. How they are handled, what address is passed, and how that address is updated when people work elsewhere is something to confirm with the provider directly and in writing. Do not assume it works as it did on the old line.

A short yearly check

Common questions

Should I get a local or a non-geographic number?

Both can point to the same phone. The question is what you want the number to say about you, and whether callers will be charged differently. That is a marketing decision more than a technical one.

Can I keep the number if I close the office?

Usually, since the number no longer needs the office. Confirm with the provider that the number is not tied to a service at that address, and move it before that service is canceled, never after.

What if the person who set it all up has left?

Find out today whether the account is in their name. If it is, start the transfer to the business now, with their cooperation while you can still get it. A number in a departed person's account is one unpaid bill from disappearing.

How many numbers do I need?

Fewer than you think for reaching you, more than you think for measuring. A separate number per campaign or channel tells you where calls come from at almost no cost. Just keep every one of them in the register.