expungeonhangup=<yes or no>
authuser=<username>
authpassword=<password>
-opentimeout=<TCP open timeout in seconds>
-closetimeout=<TCP close timeout in seconds>
-readtimeout=<TCP read timeout in seconds>
-writetimeout=<TCP write timeout in seconds>
+imapopentimeout=<TCP open timeout in seconds>
+imapclosetimeout=<TCP close timeout in seconds>
+imapreadtimeout=<TCP read timeout in seconds>
+imapwritetimeout=<TCP write timeout in seconds>
The "expungeonhangup" flag is used to determine if the voicemail system should
expunge all messages marked for deletion when the user hangs up the phone.