13D Filing: Gardner Lewis Asset Management LP and ShoreTel Inc (SHOR)

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CUSIP No. 825211105                                                                                                                                                                 Page 6 of 6

EXHIBIT A

JOINT FILING AGREEMENT

In accordance with
Rule 13d-1(k)(1) under the Securities exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing with all
other reporting persons on behalf of each of them of a statement on Schedule 13D (including amendments thereto) with respect to
the Common Stock, par value $0.001 per share, of ShoreTel, Inc. and that this Agreement be included as an Exhibit to such joint
filing. This Agreement may be executed in any number of counterparts all of which taken together shall constitute one and the same
instrument.

IN WITNESS
WHEREOF, the undersigned hereby execute the Agreement this 26st day of September, 2017.

Gardner Lewis Asset Management,
L.P.

By: Gardner Lewis Asset Management, Inc., its general
partner

Dated: September 26, 2017                                              By:
/s/ W. Whitfield Gardner

                                                                                               W.
Whitfield Gardner

                                                                                               Chairman and CEO

Gardner Lewis Asset Management,
Inc.

Dated: September 26, 2017                                                 By:
/s/ W. Whitfield Gardner

                                                                                               W.
Whitfield Gardner

                                                                                               Chairman and CEO

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