It sounds like a NAT issue to me too. Why don't you do a quick test and put the Asterisk box on a public IP if you can. If it works, you will have narrowed down the issue to a NAT problem. You could have a nat router with a broken SIP ALG.Considering that you made progress on your initial problem by setting "nat=force_rport" (resulting in connected calls with no audio) and now you're mentioning the use of "externaddr", I'd recommend a very careful reading of the "NAT SUPPORT" section of sip.conf.sample in the configs directory of the Asterisk source tree. In Asterisk 1.8, there is a new configuration option named "media_address" which may be of particular interest.
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