Updated outbound protocol engine in nua/nua_register.c
Updated outbound protocol engine in nua/nua_register.c

We enable rport and disable outbound by default.
Fixed problem when nat binding was changed.
Fixed syntax error problems when creating Accept-Contact header in
OPTIONS request used to validate registration.

darcs-hash:20060503103423-65a35-097968d747ad6ed148f6d05809bdf60d00e540c8.gz

jart/sofia-sip,xhook/sofia-sip,xhook/sofia-sip,xhook/sofia-sip,unispeech/sofia-sip,BelledonneCommunications/sofia-sip,BelledonneCommunications/sofia-sip,BelledonneCommunications/sofia-sip,erdincay/sofia-sip,erdincay/sofia-sip,unispeech/sofia-sip,jart/sofia-sip,xhook/sofia-sip,unispeech/sofia-sip,unispeech/sofia-sip,xhook/sofia-sip,jart/sofia-sip,erdincay/sofia-sip,BelledonneCommunications/sofia-sip,erdincay/sofia-sip