I help coach my 13-year-old daughter’s soccer team.
During practices, I’ll occasionally jump into scrimmages to help out – usually making the tactical mistake of assuming that because the players are still technically “kids,” things will remain reasonably safe for the adults involved.
A couple of months ago, I volunteered to play goalkeeper during one of these scrimmages, which turned out to be an exceptionally poor decision.
One of the stronger players took a hard shot from close range that struck my thumb with enough force that, two months later, it’s still swollen and doesn’t fully bend.
How did this happen? Well… it turns out that somewhere along the way, without me fully noticing it, the players had stopped being little girls, and had become dramatically bigger, faster, and stronger than they used to be.
The environment had changed gradually…
until suddenly the impact was much larger than the system (my aging body) was designed to absorb.
Telecom networks often fail the same way.
The Most Dangerous Changes Are Gradual
Major sudden changes get attention.
But gradual changes can easily be missed. A little more traffic, a few more subscribers, more SIP sessions, more routing complexity, a few extra integrations, another layer of security controls, another customer deployment…
Individually, none of these changes seem alarming. But over time, the environment evolves… and eventually the network reaches a point where assumptions that were once reasonable are no longer true.
The Problem With Legacy Assumptions
Many telecom systems were originally designed for traffic patterns, subscriber behavior, and operational requirements that no longer exist. Maybe it’s the number of subscribers, or the transition from TDM to SIP trunks, or the gradual increase in internet traffic (VoIP or HTTP) to your core network. Over time, the network grows and evolves, and eventually, you can realize that your design no longer matches reality.
Capacity Problems Often Arrive Quietly
One of the tricky things about scaling problems is that they usually appear gradually before becoming severe – intermittent issues that are easy to overlook.
- occasional call setup delays,
- intermittent registration failures,
- CPU spikes during busy hours,
- media quality degradation.
At first, these symptoms are easy to dismiss. The network still works, and customers are mostly still happy.
But systems operating near their limits become fragile. And fragile systems tend to fail at the worst possible moments.
“It Has Always Worked Fine” Is Not Capacity Planning
One of the most dangerous operational phrases in telecom is this: “We’ve never had a problem before.”
That statement is often technically true right up until the moment it stops being true.
The soccer players didn’t become stronger overnight. The environment changed slowly over time – until that one hard shot, at just the wrong angle, caused a problem my thumb never saw coming.
Likewise, many telecom failures occur because networks continue operating under assumptions that quietly expired years earlier. The system usually works, but then one blip – perhaps a maintenance event or a spike in traffic – causes the system to overload, and suddenly it’s very hard to recover.
Good Engineering Requires Re-evaluation
One of the hardest operational disciplines is periodically re-evaluating systems that appear stable.
Because stability can hide accumulated risk.
Mature operators regularly ask:
- Are our original assumptions still valid?
- Has traffic growth outpaced design expectations?
- Are our failover systems still appropriately sized?
- Are old architectural decisions becoming bottlenecks?
- What happens during peak load?
- What happens during partial failure?
These are uncomfortable questions because they often reveal that yesterday’s “safe margin” has quietly disappeared. A network that once handled everything comfortably may find itself absorbing an impact it was never designed to withstand.
If you’ve seen big changes in your voice network, or growth in your IP network, and you would like someone to take a look and check the design is still fit for purpose, reach out and we’d be happy to discuss your situation and how we can help.
