[asterisk-users] Calls drop + "Didn't get a frame from channel" log message

[gincantalupo]

Hi,

sometimes Asterisk drops calls and shows "Didn't get a frame from 
channel" in its log file. Unfortunately Google gives no answers even if 
a lot of people ask for help.
A fast look into the code shows Asterisk entering a loop where voice is 
been transferred and every loop Asterisk waits for a frame, exiting the 
loop if no frame has arrived. It seems to be a problem not depending on 
the kind of channel...happens with ISDN and PRI lines.
What is stopping the frames, making Asterisk exiting that loop and 
dropping the calls?

Thank you.

Giorgio.