[asterisk-dev] Asterisk NAT Prolem

[Dome C.]

Dear sir,
I found some bug (or may be not).
When i use SIP softphone behind Zyxel Prestige 600 in SUA mode.

This is message when register
 >>Registered SIP 'dome' at 203.156.4.220 port 17828 expires 1800
 >>    -- Saved useragent "WOSISIP 1.0" for peer dome
 >>Transmitting (NAT) to 203.156.4.220:17828:
 >>SIP/2.0 200 OK
 >>Via: SIP/2.0/UDP
It's Ok. when i try to make a call got error.

 >>Jan 20 00:00:20 WARNING[5473]: chan_sip.c:3424 process_sdp: Unable to 
lookup host in c= line, 'IN IP4 >>203.156.4.2200'
 >>Transmitting (NAT) to 203.156.4.220:17828:
 >>SIP/2.0 488 Not acceptable here

I use Asterisk  1.2.1


Dome C.