asterisk users - Oct 2014 - Lost audio on forwarded calls

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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Asterisk does not need to care.  Is it SIP all the way through?

Thanks,
Steve T

On Fri, Oct 3, 2014 at 3:12 PM, Todd R. <tjrlist at live.com> wrote:
> 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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