I am having an issue with call forwarding on an 18.12 system located in an AWS EC2 instance with a Calltower SIP Trunk. Call forwarding works on some extensions but not others. I have done a stare and compare on a few pcaps and it looks like the ones that fail the call forward are trying to respond to the AWS subnet local IP address instead of the elastic IP. I am thinking its a codec issue because the ones that go through are using G722 and the ones that fail are using G711. I've tried to remove the G711 codecs from the phones assigned to the user but that doesn't do anything. I believe this is the same issue causing external call transfers from extension to extension to drop.Any ideas on how I can fix this?
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