[Asterisk-Users] Asterisk hangs up on incoming PSTN line to analog extension

[Robert La Ferla]

I have encountered the following problem with the latest Asterisk source 
(as of 4/23/2006):

Someone calls me on my PSTN line, it then dials my analog extension (I 
have both SIP and analog phones where all analog phones are a shared 
extension.)  After a while, I get a busy signal.  How can I further 
diagnose this?  What could be the problem?