Hi all,
I enabled firewall log and found out that the Billion router uses UDP port range 5100-5103 for audio, not the well known 16384-16482 UDP port range.
Open up those ports and all is good, I have audio both ways now.
I also open up the seem to be voip standard UDP port ranges 5060-5061 and 16384-16482, just to be sure. There is no need to do any port forwarding (virtual server).
Thanks moollar for giving me the idea.
Cheers.
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