If a speed dial entry _could_ be a call pair for a web callback with a slight delay, then that would solve your problem. There is already a phone book for web callbacks initiated via a mobile, so if such entry could be added to a speed dial.... in which case you would call home, then use VoIP to voxalot to call the speed dial, hangup and wait for the call; but again, it will rely on you having the call pair setup before your call.
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