I have a situation where i have:

Asterisk => PSTN gateway
openSER => registrar/proxy

PhoneA -> openSER -> Asterisk -> PSTN phoneB

my phones connect to openser...

calls are sent out to the PSTN using Asterisk...but when phoneA hangs up, Asterisk does not receive the hang up signal.

If PSTN phone B hangs up, asterisk receives the hangup signal.

I'm reading forums but not receiving any real solution? is there anyway of fixing this?

-
Gerard