Security	Date	Code	Shares	Price	A/D	D/I	Nature of ownership
Common Stock^F1,F2	Apr 29, 2015	U	1,695,587	$17.55	D	I	See footnote
Common Stock^F1,F3	Apr 29, 2015	U	831,072	$17.55	D	I	See footnote
Common Stock^F1,F4	Apr 29, 2015	U	1,826,275	$17.55	D	I	See footnote

Table II — derivative securities

No Table II lines on this filing.

Explanation of responses

F1These shares are being disposed of upon the completion of an exchange offer by Mitel Networks Corporation ("Mitel") and Roadster Subsidiary Corporation to purchase all of the issued and outstanding shares of common stock of the Issuer, pursuant to an Agreement and Plan of Merger dated February 28, 2015 and amended through the date of this form. The tender price per share of the shares of common stock is (i) $17.55 in cash; or (ii) 1.8320 shares of common stock of Mitel, at the election of the holder and subject to proration.
F2Represents securities held of record by North Bridge Venture Partners V-A, L.P., or NBVP V-A. North Bridge Venture Management V, L.P., or NBVM V, is the sole General Partner of NBVP V-A. NBVM GP, LLC, the General Partner of NBVM V, has ultimate voting and dispositive power over the shares held of record by NBVP V-A. Shared voting and dispositive power of such shares is vested in Edward T. Anderson and Richard A. D'Amore. Each such person and entity disclaims the existence of a "group" and disclaims beneficial ownership of any securities (except to the extent of such person's or entity's pencuniary interest in such securities).
F3Represents securities held of record by North Bridge Venture Partners V-B, L.P., or NBVP V-B. North Bridge Venture Management V, L.P., or NBVM V, is the sole General Partner of NBVP V-B. NBVM GP, LLC, the General Partner of NBVM V, has ultimate voting and dispositive power over the shares held of record by NBVP V-B. Shared voting and dispositive power of such shares is vested in Edward T. Anderson and Richard A. D'Amore. Each such person and entity disclaims the existence of a "group" and disclaims beneficial ownership of any securities (except to the extent of such person's or entity's pencuniary interest in such securities)
F4Represents securities held of record by North Bridge Venture Partners VI, L.P., or NBVP VI. North Bridge Venture Management VI, L.P., or NBVM VI, is the sole General Partner of NBVP VI. NBVM GP, LLC, the General Partner of NBVM VI, has ultimate voting and dispositive power over the shares held of record by NBVP VI. Shared voting and dispositive power of such shares is vested in Edward T. Anderson and Richard A. D'Amore. Each such person and entity disclaims the existence of a "group" and disclaims beneficial ownership of any securities (except to the extent of such person's or entity's pencuniary interest in such securities)