sip
5 feeds in the directory cover this.
AI and VoIP Blog
VOIP | AI | Cloud | Kamailio | Open Source
TXLAB
Just another hacking blog
Worth Doing Badly
Programming experiments by @zhuowei.
Falkus.co
Projects and writing of a Falkus
James Bottomley's random Pages
A collection of information
Machine-readable: JSON · all topics