I believe you can buy it from Vocaltec , or for RTP you could also use utilities as RTPdump

Olivier HERSENT

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De : Rod Gotty[SMTP:rgotty@DIALISDN.COM] Répondre à : Mailing list for parties associated with ITU-T Study Group 16 Date : Wednesday, August 26, 1998 3:30 PM A : ITU-SG16@MAILBAG.INTEL.COM Objet : Protocol analyzing tools for VoIP?

Could someone please direct me to where I might find tools for "sniffing" a LAN segment and expose the VoIP traffic. I'm looking for something more than just a LAN protocol analyzer that only shows TCP & UDP frames but something more that recognizes the various VoIP protocols (RTP, H.245 messages, etc) and breaks them down into constituent fields.

Thanks -Rod