[asterisk-users] upgrade from 1.2 to 1.4 and now half channel audio

[Jerry Geis]

Hi all,

I upgraded from asterisk 1.2.23 and zaptel 1.2.19
to asterisk 1.4.18 and zaptel 1.4.12.1
I use polycom 501 phones internally.

Everything seems fine. I can pick up the phone and call out,
calls coming in work just fine.

The issue I see is when the system first calls me,
then calls someone else. This works if its polycom to polycom. I hear 
audio full channel.
If I do  polycom to external line like a cell I only get HALF channel audio.
At this time they can hear me but I cannot hear them.

What might this be???

Jerry