In SIP both 180 and 183 can have SDP carry early media.
acc_logic.c: if (code < 200 && ! (early_media && code==183))
acc_logic.c: if (code < 200 && ! (early_media && (code==180 || code==183)))
It shouldn't be a problem since the accounting will still have the code on it. Are there any comments objections? If not let's add this to trunk.