[cisco-voip] Text-messaging app

[Simon, Bill]

Anyone know of / written a simple phone-to-phone text messaging app?

I think I could write something like this but I'm hung up (pardon the 
pun) on one issue... how to identify the phone to send to.

In our environment we have one user assigned several phones.  Or one DN 
as a shared line on many phones.  The only unique identifier is MAC 
address, which is not end-user-friendly.

Just putting this out there for people's thoughts.