Exhibit 24
                                POWER OF ATTORNEY


         KNOW ALL BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints Jay Spitzen and Robert J. Zollars, and each of them, his true and
lawful attorney-in-fact to:

         (1) execute for and on behalf of the undersigned, in the undersigned's
     capacity as a representative of Vocera Communications, Inc. ("Company"),
     any and all Form 3, 4 or 5 reports required to be filed by the undersigned
     in accordance with Section 16(a) of the Securities Exchange Act of 1934, as
     amended ("Exchange Act"), and the rules thereunder with respect to
     transactions in securities of Vocera Communications, Inc.;

         (2) do and perform any and all acts for and on behalf of the
     undersigned which may be necessary or desirable to complete and execute any
     such Form 3, 4 or 5 report and timely file such report with the U.S.
     Securities and Exchange Commission and any stock exchange or similar
     authority; and

         (3) take any other action of any type whatsoever in connection with
     the foregoing which, in the opinion of such attorney-in-fact, may be of
     benefit to, in the best interest of, or legally required by, the
     undersigned, it being understood that the documents executed by such
     attorney-in-fact on behalf of the undersigned, pursuant to this Power of
     Attorney, shall be in such form and shall contain such terms and conditions
     as such attorney-in-fact may approve in his discretion.

             The undersigned hereby grants to each such attorney-in-fact full
power and authority to do and perform each and every act and thing whatsoever
requisite, necessary and proper to be done in the exercise of any of the rights
and powers herein granted, as fully to all intents and purposes as the
undersigned might or could do if personally present, with full power of
substitution or revocation, hereby ratifying and confirming all that such
attorney-in-fact, or her substitute or substitutes, shall lawfully do or cause
to be done by virtue of this Power of Attorney and the rights and powers herein
granted. The undersigned acknowledges that no such attorney-in-fact, in serving
in such capacity at the request of the undersigned, is hereby assuming, nor is
the Company hereby assuming, any of the undersigned's responsibilities to comply
with Section 16 of the Exchange Act.

             This Power of Attorney shall remain in full force and effect until
the undersigned is no longer required to file Form 3, 4 or 5 reports with
respect to the undersigned's holdings of and transactions in securities issued
by the Company, unless earlier revoked by the undersigned in a signed writing
delivered to the foregoing attorneys-in-fact.

             IN WITNESS WHEREOF, the undersigned has caused this Power of
Attorney to be executed as of the 8th day of March, 2012.

                                         /s/ William Zerella
                                         ---------------------------------------
                                         William Zerella