> My topology is...
> 
> 
> WAN  ========= cicso pix 501 firewall  =========== DMZ 
> (subnet)======== Microsoft ISA 2006 firewall/proxy 
> =========== Internal Network
> 
> DMZ network spans 2 subnets.  They are 192.168.4 and 
> 192.168.5.  The sipx server's address is 192.168.4.25.
> 
> I have successfully configured bridging and remote worker 
> processes.  Meaning,  1) from wan, I am able to register and 
> make phone calls 2) from 192.168.4 subnet, I am able to 
> register and make phone calls.  However, though I could 
> register from 192.168.5 and internal networks, I can not here 
> audio (I think it is one way)  when making phone calls.
> 
> What provisions would I have to make to be able to place 
> successful phne calls from 192.168.4 subnet.

Go under Services->Internet Calling->Intranet subnets and be sure to include 
192.168.5.0/24 in the list (along with 192.168.4.0/24).  Also, do remote the 
defaults that do not correspond to the subnets you have behind your NAT.
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