The DestinationPicker now offers every type that exists (user, voicemail,
ring group, digital receptionist, office hours, announcement, outside
number, hang up) on every page that routes calls; queues and
conferences join in M8. API summaries show the number of dialable
targets ("Ring group Sales (500)", 05 §3). Wizard step 8 gains "Ring
everyone": it creates or refreshes a ring group "Everyone" of all
extensions (unanswered → the first user's voicemail); an IVR isn't
created there because it needs a recorded greeting. m3-t5 now routes
the main number through "Ring everyone" and still passes.
Task: M6-T6
/api/ivrs CRUD: greeting and wrong-key sounds must be prompts, every
option destination must exist (an option may point at its own menu),
keys unique; delete drops the menu's own options before checking
references, inside a transaction so a refused delete keeps them. The
generator renders sp-ivr-{id} per 03 §6.9 (Background greeting,
WaitExten, keys sorted, i/t retry then give up, include sp-local-numbers
for direct dial), adds the number to sp-local-numbers, and destApp sends
ivr destinations there. Golden case ivr (incl. # and self-reference).
Web: Digital receptionist page with a 3x4 keypad grid (pick a key, then
its destination or "unused"), SoundPicker (pick, play, upload new right
in the form), DestinationPicker gains "Digital receptionist" and a shared
target source; useDescribeDestination labels unsaved keys.
e2e m6-t3: menu built in the UI, the greeting plays, keys 1/2 ring the
right phones, a wrong key plays pbx-invalid and repeats the greeting.
Task: M6-T3
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