I am trying the CT MEssenger examples, but am not getting anywhere as it seems no answer is ever detected, whether or not I use Software Answer Detection.

The number is successfully dialled and the phone rings, but there is silence then it hangs up.

Running the Report example, the report has a status of InProgress, then the call hangs up and the status changes to Completed. The SubReport shows a status of InternalError, and the Call item shows a duration of usually 6-8secs, and Answer=Unknown.

I am using a Zoom 3049 Serial modem.
I have also tried this with Avaya IP Office, and get the same results.

Any ideas? I'd much rather not have to purchase a telephony card - am only looking to make the odd call now and then.

I believe you're on the wrong forums... these forums are for TeleFlow users. CT Messenger is another product altogether.

If you do have an interest in a telephony card solution in the future, you might consider TeleFlow. You don't need to a telephony card to try it, as the TeleFlow Simulator will let you try it on your desktop with a sound card & speakers.