HEINRICHS R STEPHEN

• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Activity signal Earnings

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Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other

Notification date	Transaction date	Company	B/S Transaction type	Nb. shares Price Value	Number of shares	Price	Value
2004-07-30	2004-07-30	Avistar Communications Corp (AVSR)	B Purchase	97,691 +1.1% 459.05 US$128,746	97,691 +1.1%	459.05	US$128,746
2004-07-29	2004-07-29	Avistar Communications Corp (AVSR)	B Purchase	84,859 +10.4% 281.73 US$2,313,942	84,859 +10.4%	281.73	US$2,313,942
2004-07-28	2004-07-28	Avistar Communications Corp (AVSR)	B Purchase	2,216 -19.8% 309.43 US$1,452,098	2,216 -19.8%	309.43	US$1,452,098
2004-07-27	2004-07-27	Avistar Communications Corp (AVSR)	B Purchase	15,100 +12.9% 0.86 US$12,921	15,100 +12.9%	0.86	US$12,921
2004-07-26	2003-05-22	Avistar Communications Corp (AVSR)	B Purchase	1,500 +1.3% 1.00 US$1,500	1,500 +1.3%	1.00	US$1,500
2004-07-26	2003-05-22	Avistar Communications Corp (AVSR)	B Purchase	2,000 +1.8% 0.99 US$1,980	2,000 +1.8%	0.99	US$1,980