Telecom

Starting a Dutch eSIM webshop (esimopreis.nl) as a side project: how eSIM reselling works, the Next.js + Supabase stack, and landing my first paying customers.

Odido's lawyers threatened to sue over heeftodidoalipv6.nl, my joke site about their missing IPv6 rollout — the trademark dispute and why IPv6 matters.

Turn Asterisk into a Microsoft Teams Direct Routing SBC by patching res_pjsip_nat.c, configuring a TLS transport with acme.sh, and setting up PSTN calling.

Pager networks still run on POCSAG at 1200 baud. With a cheap RTL-SDR, rtl_fm and multimon-ng you can receive unencrypted POCSAG messages and CAP codes.

How to block anonymous callers with an Asterisk call screening dialplan that records the caller's name and lets you accept, reject or reroute the call.