Blog
Notes from the network
Engineering write-ups, fraud analysis and unvarnished opinions about wholesale telecoms.
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Engineering
Why answer-seizure ratio lies to you
ASR is the first number everyone looks at and the easiest one to game. Here is what it hides, and which metrics actually predict a good call.
Glovox Telecom 2 min read -
Engineering
Designing webhooks that survive your outage
At-least-once delivery means your handler will see duplicates. Here is the contract we publish, and what it asks of the receiving end.
Glovox Telecom 1 min read -
Security
Anatomy of a Wangiri campaign
Wangiri fraud is simple, cheap to run, and still works. A walk through one campaign and the three controls that stopped it.
Glovox Telecom 2 min read -
Industry
Number portability is a distributed systems problem
Portability broke the assumption that a prefix identifies an operator. Routing on stale data is how calls end up somewhere expensive.
Glovox Telecom 1 min read -
Industry
What we mean by carrier-grade
Every provider claims it. Here are the specific commitments we are willing to be measured against.
Glovox Telecom 1 min read -
Product
Sender ID registration, explained
A growing number of markets require pre-registration of alphanumeric sender IDs. Unregistered traffic does not bounce — it disappears.
Glovox Telecom 1 min read
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Roughly monthly. Engineering write-ups and fraud analysis, not product announcements.