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ZS fills the niche above tomato / wrt and is getting close to a real biz / production router. However the expectation in knowledge, is in the same place, there are not so much help pages. ZS shines when u use multiple internet connections, ex a DSL and an LTE connection in the same time.
I putted in NAT both external and internal lan interface
Only interfaces used to go to internet should be on NAT box.
I have port forwarding on RTP and SIP port like in WRT54Gl and I have audio problems
Usually sip should be deal only by kernel modules as long as it use 5060 or 5051, my sip works with no setup (no firewall). However you need more ports forwarded on firewall. http://www.3cx.com/blog/docs/draytek-firewall-voip/
I use csipsimple on android and a pap device in the same time without any issues. (except the conntrack that affect only pap device