Owner's decision after the M11-T8 review: nothing capped how many calls a stolen password could run at once. Settings → Security: calls.maxPerExtension (3) and calls.maxTotal (10), 0 = no limit. Each sp-route-* counts the caller's extension (or whose forward it is: SP_LIMITEXT from sp-sub-forward) with GROUP(spext) and every outside call with GROUP(spout); over a limit the caller hears "all circuits are busy". 911 is never limited. trunk-test.ts on a real Asterisk, limits 1 and 2: a 2nd call from 101's phone and a 3rd in total are refused (with both 0 the same check fails). call-limits.test.ts covers the 0 combinations. Also fixes the Security tab's hint: browser phones still work from anywhere. Task: M11-T8