Good news and not-so-good news.
The current version of the modem connection monitor does not allow for control character representation in the send/recv data outside of the cr and lf. However... we can incorporate the control character coding specification that used in the Paging script functionality without too much problem.
While there are several updates and enhancements in production for IPSentry at this time, will delay any full maintenance release until after successful testing, I can provide you with a 'beta' of the modem connect add-in if you would like to try out the control character functionality.
Contact me at firstname.lastname@example.org
and I can send you a download url and instructions.
Basically, you will be able to get an escape character into the data to send or receive by specifying either <ESC> or <\027> as these both represent the escape character ASCII 27.
e.g. <ESC>A will actually convert <ESC> to ASCII Character 27 and leave the A as is.