Security - We will get there

I consolidated my trixbox server recently into a vmware server, this time I also upgraded the trixbox to the latest version. To verify my system document, I didn't do backup/restore type of upgrade, instead I recreated the new trixbox configuration plus some modification according to the new requirement. Everything went well util one week after I got several complaint, they get "an-error-has-occured" message when making inbound calls and it looks like intermittent problem. I tried several times to reproduce the error but couldn't catch it until today. It's caused by the calling plan of FreePBX and here is how I fixed it.

1. If you don't have voice mail enabled and that extension is busy, you will get "an-error-has-occured" message when tried call that extension. After enable the voice mail from Freepbx extension setup, it's fixed.
2. The reason why voice mail box wasn't enabled is because I want to use my own phone's answer machine, If I have to enable the voice mail box, then I will need to setup a very waiting timer before tranfer the call to voice mail box. In FreePBX/General setting, "Number of seconds to ring phones before sending callers to voicemail:" is the parameter I need. It's in the conf file extensions_additional.conf as RINGTIMER = ???.

It may worth to study the dialing plan later on if I have more free time. :-)