asterisk users - May 2003 - Current SIP channel features supported

Is there a good crib sheet showing the features currently supported in
the SIP channel where the channel is being used to access a SIP provider
such as ICH?
 
I basically want to set the * SIP client so that it registers with ICH
for incoming calls. The * system is behind double NAT. An ATA 186 works
fine (apart from the normal ICH blitches.) using both the gateway/proxy
and outgoing proxy settings (set to natrelay.deltathree.com). Does *'s
SIP channel have equivalent support ?
 
Thanks for any info.
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