On Sep 10, 8:40 am, Android Development <[email protected]> wrote:

> But if this connectivity was lost
> during the course of a SIP call, then i need to 'drop' the call, clean up
> its FSM and stop RTP flow.

If you are on a SIP call, I would think by definition that the
processor is not sleeping.  Therefore, if the network fails while you
were so using it, isn't it safe to assume you will be awake to know?

And if the network fails while you are not on a call, and thus
potentially asleep, what useful activity do you want to do based on
that?   Tell  the user that they are now out of touch?  You could, but
most "cell" phones do not do this.

The perhaps interesting case would be when you drive back out of that
tunnel, while still asleep.  There you might like to re-connect
automatically, and you may well not get any wakeup action to do so.
This is presumably why the gsm or whatever radio on the "cell phone"
side of the device is managed by a separate processor presumably
configured to frequently wakeup for radio network housekeeping without
drawing a lot of power.

Most current smart phones don't seem to be optimized to be ideal voice-
over-wifi devices; to be such they'd need that radio processor to
handle the routine housekeeping of sip over wifi or whatever as well.
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