Netmeeting is H.323, it will work with Ekiga but with restrictions. On the Ekiga side, you should disable the options unsupported by Netmeeting: H.245 tunnelling and STUN support. AFAIK the only workable codec is PCM 8kHz (uncompressed) which will use 64kbps, so this is not workable on dialup. I have installed the Speex codecs on NM, but never managed to get them to operate with Ekiga. The sound quality of the MS-GSM codec is appaling.