Hi,
Glad to hear you got it going!
A little tip: Put the carriage return on the same line as the 'command'
Code:
SerOut Tx,t9600,[65,84,72,49,13] ' Off Hook ATH1, CR
Should work the same and you'll save a couple of bytes for each instance. Also Serout....["ATH1",13] should work the same but makes the code easier to understand, to me atleast....YMMV.

Good luck with the project!

/Henrik Olsson.