I am able to register the phone since the last post. I fixed it by editing the phone .cnf file that contains the private IP address of the call manager. This seems to be a very poor solution, but it works.
My problem now is that I think the RTP stream is "broken". Basically, it seems that PIX doesn't change the private IP address of the remote phone (going over NAT), which means that there is only one way conversation. When I speak to headset attached to ATA the other side doesn't hear anything, but it works the other way around.
Any ideas? Has anyone done this before? Am I approaching the problem correctly?
P.S.: I posted something that might resemble a diagram in "ATA remote location design recommendation" thread.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
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