Re:signaling channel is a finite resource (Score 1)

If the signalling channel is so limited why they are not using the data channel-I mean the voice channel to send SMS. Second SMS is not delivered real time. So you can always provision enough BW for dialling and ringing the 911. Nobody stops Telecos & Mobile phone companies to modify the standard to send SMS or ASMS-Advanced SMS!!!! as paid data . But why there is no alternative :)