Trunk sizing is an Erlang calculation, not a headcount. How to work out the number, and why buying one channel per extension wastes most of what you pay for.
G.711 or G.729 is a bandwidth decision, a quality decision and a licensing decision at once. The arithmetic, including the overhead everyone forgets.
The technical part of a PRI-to-SIP migration is the easy part. Number porting, emergency calling and the cutover order are what decide how it goes.
Extension numbering looks trivial until a merger, a new site or a fourth digit forces a renumber. How to design one that absorbs change.
Three different faults that all get reported as "the line is bad". Each sounds distinct, each has a different cause, and each is measurable.
Most voice failover plans are a second internet circuit and an assumption. The failure modes worth planning for, and how far each layer of protection actually gets you.
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