In chan-sip.c (from 1.2.12.1) it is written: 06223 /* On a REGISTER, we have to use 401 and its family of headers instead of 407 and its family 06224 of headers -- GO SIP! Whoo hoo! Two things that do the same thing but are used in 06225 different circumstances! What a surprise. */ Why is this so? </edg>