We recently have had a few customers who are using computer based modem and compatible TAP software with OpenTAP and they have been having trouble dialling up and sending messages via our OpenTAP dial up access numbers.
Some times for some reason with some customers modems and their software it will not work properly with PARITY setting of NONE (NULL). Try changing the PARITY setting to TRUE (EVEN). This should resolve the issue, however our system does support all formats. It seems to be a localised issue with some users computer based software and modems.
Country: United Kingdom
Dial-in number: 07045607101
Modem Settings: 7,e,1
Modem Speed: All
This issue is not applicable and does not occur with standard security alarm control panels!