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How a phone call actually works

Notes on routing, queueing and call control, written from the code that runs Ringfully, not from a content calendar.

Recently updated

Updated September 10, 2026

The Do Not Call list, explained

Updated September 10, 2026

Is a cloud phone system a PBX?

Updated September 9, 2026

A phone tree template that works

All posts, by topic

Cloud telephony

What a cloud phone system is, what it replaces, and what it costs to run one in Quebec.

Numbers and porting

Getting a business number, and moving an existing one without losing calls.

Quebec area codes

The 418, 819, 450 and 514 families: which regions each covers and what that means for a business line.

Call flows and IVR

Auto-attendants, menus, business hours and the routing behind them.

Queues and routing

Skills-based routing, waiting callers, and what a queue can and cannot do.

Transfer, hold and conference

The mechanics of moving a live call: assisted transfer, hold, and three-way merge.

Law 25 and Law 96

What Quebec's privacy and language statutes ask of a phone system, and what they do not.

Migrating from a PBX

Moving off an on-premise system or a Centrex line, and what breaks if you rush it.

Accounts and access

Who can sign in, what each person may see and do, and what happens to an account when somebody leaves.

VoIP basics

What VoIP is, how a call actually travels over the internet, and how it differs from a landline or a mobile.

Softphones and apps

Making and taking calls from a computer or a phone: what a softphone is, what it needs, and when a desk phone still wins.

Spam and call blocking

Caller ID, unwanted calls and do-not-call obligations, from the point of view of the business placing and answering the calls.

SIP and networks

SIP trunking, SIP ALG, bandwidth and quality of service: the plumbing under a phone system, and what breaks it.