だめだ、pfでも全く話にならん。

root# cat pf.test

# macros
ext_if = "ng0"
int_if = "em0"

# options
set block-policy drop
set loginterface $ext_if

# scrub
scrub in all
scrub out on $ext_if all random-id max-mss 1414

# nat all int -> ext
nat on $ext_if from $int_if:network to any -> ($ext_if)
rdr pass on $ext_if inet proto udp from any to any port sip -> 192.168.0.230 port sip

# default filter
pass in all
pass out all

root#

これしか書いてないのに、SIPメッセージがリダイレクトされないとか、それ
何の冗談 orz