Added Doxygen entries for SIPTAG_*_REF.
Added Doxygen entries for SIPTAG_*_REF.

darcs-hash:20051110162748-65a35-8819d3cb46ac4789b5b56613699b631c505ee376.gz

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