Made a breakthrough on my Asterisk PBX today.
I have been having an issue with the Sendmail functionality. Basically the idea is that when somebody leaves a voicemail, then the owner of the Voicemail box is emailed a copy of the wav file. Asterisk@home worked as expected for a couple of weeks, then stopped for no apparent reason. (I had not changed anything)
After searching the forums, and dinking around with the sendmail configuration, I finally decided to turn the server from Fixed IP to DHCP. I suspected that my lease expired from the original boot up. When I did this , all of the spooled mails went out.
I left it on DHCP for a while, but that was not a long term solution. Unfortunately the router we have does not have the option to assign IP address based on the MAC address. Whenever I set the server up with a fixed IP my email notifications stopped flowing. I have to set a fixed IP, or my phones will not know where to connect.
I have tried several different things to fix this issue. Finally I upgraded the Linksys Wireless router to the latest and greatest firware, and the problem was resolved.
It is always the last thing that you try that fixes a problem.. ;-)
I turned on Quality of Service in the router, giving SIP packets a high priority. This helped our audio quality substantially. I have on Generic FXO card that echos terribly. I am going to replace that with a higher quality card, In the mean time we are using a single line.