OK, been messing with Asterisk for a long time and I have my opinion on where 
the issues lies but sometimes it's just nice to see what others think that can 
relate :-)
Here goes.. 
Inbound calls flow like this:Tier 1 Provider (SIP) > Asterisk 1.8 > Name Brand 
PBX - Calls work fine
Outbound calls flow like this:Name Brand PBX > Asterisk 1.8 > Tier 1 provider 
(SIP) - Calls work fine

Problem is being reported on that many (not all) calls have no audio when they 
are forwarded.
Example of forwarded call:Inbound call comes in from Tier 1 Provider > Asterisk 
1.8 > Name Brand PBX
Name Brand PBX then forwards the call back out to users cell phone:Name Brand 
PBX > Asterisk 1.8 > Tier 1 provider
No audio a large percentage of the time.

It's my opinion that the Asterisk box only sees the forwarded call as a regular 
outbound call and forwards it on to the Tier 1 provider then to the users cell 
phone.
I don't see how Asterisk even knows or cares if it was forwarded within the 
Name Brand PBX. The Name Brand PBX is the one making the connection of the 
inbound and outbound call. All other inbound and outbound calls are fine, audio 
is only lost when the Name Brand PBX connects the two calls and creates the 
forward.
Thoughts?                                         
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