nua_register.c: try to check for IP address families when selecting Contact.
nua_register.c: try to check for IP address families when selecting Contact.

darcs-hash:20060817183620-65a35-680a1b79be504fa8f031f713242c3207ca1c22d9.gz

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