Resources — Guides, Checklists, Comparisons & Glossary | Barbary Systems
RESOURCES

Read before
you buy.

Plain-English guides, working checklists and honest comparisons — useful whether you buy from us or not.

FEATURED — DEADLINE: JANUARY 2027
The PSTN switch-off: what dies, what survives,
and what to do about it
→
Guides
Long-form, plain-English answers: what VoIP actually is, how number porting works, how to size an IoT data plan.
8 GUIDES →
Checklists
Step-by-step working lists: switching provider, PSTN readiness, opening a new site, buying IoT SIMs.
4 CHECKLISTS →
Comparisons
Side-by-side, with the trade-offs stated: VoIP vs landline, cloud vs on-prem PBX, single vs multi-network SIM, eSIM vs plastic.
6 COMPARISONS →
Glossary
A–Z
SIP, PBX, APN, PAC, eSIM, IVR — every acronym the industry throws at you, decoded in one page.
30+ TERMS →
Case studies
Real deployments with real numbers — being written up with the customers now.
COMING SOON