There are a few possible reasons why they 09018600011 OpenTAP access number is not working.
- Some phone companies block pager numbers, so you will need to call your phone line company and ask them to remove the barring for 09018600011.
- Your alarm system modem is not set to the default parity setting which should be set to 7-e-1.
- Your alarm system modem is faulty.
For more assistance, please call your alarm system installation engineer.