Dispatches
Written by the people who hold the platform. Published whole, without registration, because gated technical writing is an obstacle rather than a courtesy.
Studies
Method rather than opinion. Written to be used while doing the thing.
Measuring concurrency
Deriving the figure from records, and the two categories records will never contain.
Fitting a layer into an existing estate
What to establish first, and where these projects actually go wrong.
Locating a quality fault
Three metrics, three symptoms, and locating the fault by layer.
Notes
One idea each, argued to its limit and then stopped.
If it speaks SIP, almost certainly. Legacy TDM platforms connect behind a gateway during transition. Unusual or heavily customised platforms are proven on a trial trunk before production traffic.
Roughly 100 kbps per concurrent call with common codecs and overheads. Bandwidth is rarely the binding constraint; queuing delay and jitter are, which is why prioritisation matters more than headline speed.
Jitter, packet loss, round-trip time and completion cause, per call, retained. That is the basis for both fault location and capacity review.
TLS signalling and SRTP media are the default where the endpoint supports them. Where one cannot, the exception is recorded and revisited rather than silently accepted.
Minutes after agreement. It is a configuration value; no site visit and nothing to install.