Hi all,

I have actually thought of designing a fixed phone
which can send and receive SMS just like what Peter
has mention. Ken Boak has shown us that we can really
put in DTMF and V23 in a single PIC and let two phones
communicate with each other with the mininum
component. But to have the ability of SMS, there are
several problems which i could think of -

1. Let's imagine that the phone is going to receive
SMS just like a handphone. That means the phone can
receive SMS when -

- the phone is being used
- the phone is on hook

How are we going to do that? I don't know much about
telephone exchange, but i guess, if these capability
are to be achieved, then there must be tight
cooperation with the phone company. ( will they be
bothered ? )

2. Let us downgrade our functionality. Let say to send
a SMS from A to B, A phone will automatically dialed
up to a common number ( just like 911 ). The common
number is some sort of like an exchange and will
accept the message from A. It will then dial to B
phone to transfer the message.

Now here is the problem, how would B know how to
differentiate between a normal voice call and an SMS?

Perhaps -
1. again we can liase with the phone company to add in
a signal ( just like caller id ) along with the
ringing tone. but will they do that? can they do that?
2. follow the fax system.

Please let me know your view.

Rgds,

pang

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