SIP Load Balancing Became an Architecture Problem, Not a Proxy Rule
Once dialog state, media anchoring and backend health mattered, forwarding INVITEs round-robin was the easy part.
FreeSWITCH
Routing Calls Across Two PBXs Without Turning Kamailio into a PBX
A two-PBX lab clarified the boundary between SIP routing at the proxy and dialplan or application behavior inside the PBX.
FreeSWITCH Capacity Testing Needed More Than a Calls-Per-Second Number
Call setup rate, concurrent calls and media work stress different parts of a voice platform.
My First FreeSWITCH Lab After Getting Comfortable with Asterisk
FreeSWITCH forced me to separate the concepts I understood from Asterisk from the implementation details I had simply memorized.
FreeSWITCH Session Counts Need Per-Node Breakdown
A healthy total session count can hide a load-balancing problem if one FreeSWITCH node carries nearly all calls while another remains idle.
The Call Worked Until BYE: Debugging Dialog Routing in OpenSIPS and Drachtio
A call can establish, carry clean audio, and still fail at BYE when the dialog route set, backend affinity, or media cleanup path is wrong.
FreeSWITCH Health Is a Fleet Count, Not One Boolean
A multi-worker voice stack can keep serving calls after one FreeSWITCH node fails, so one global up/down flag hides degraded capacity.
WebRTC Added More Than a Browser to My VoIP Lab
WebRTC forced me to deal with WSS, ICE, DTLS-SRTP and browser security assumptions instead of treating a browser as just another SIP phone.
A SIP Load Balancer Needs Dialog Awareness Somewhere
Distributing initial INVITEs is easy; keeping in-dialog requests on a valid path is where the architecture starts to matter.
Worker Heartbeat Age Catches Silent FreeSWITCH Failure
A FreeSWITCH process may remain alive while its worker integration stops reporting useful state to the signaling layer.