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There is a race condition in the initial registrations at boot time.
The phone attempts to clear any previous registered contacts, but does
not finish that before it begins its new registration.
The result is that the unregister finishes _after_ the new registration, leaving the phone not registered (but it thinks it _is_ registered, so it doesn't refresh the registration until the regular refresh time).
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There is a race condition in the initial registrations at boot time.
The phone attempts to clear any previous registered contacts, but does
not finish that before it begins its new registration.
The result is that the unregister finishes _after_ the new registration, leaving the phone not registered (but it thinks it _is_ registered, so it doesn't refresh the registration until the regular refresh time).