UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of

The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): January 9, 2013

DIALOGIC INC.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (408) 750-9400

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Item 2.05. Costs Associated with Exit or Disposal Activities

On January 9, 2013, Dialogic Inc. (the “Company”) and its affiliates executed upon a restructuring plan and notified affected employees or commenced consultation processes with affected employees that collectively can lead to a workforce reduction of approximately 95 full-time positions, or approximately 13% of the Company and its affiliates’ combined workforce. The notice periods for employees vary by country. Affected employees are eligible to receive severance payments totaling approximately $1.5 to $2.5 million, in exchange for a customary release of claims against the Company or its affiliates in those countries where the severance amounts exceed what is required under applicable law. The Company and its affiliates are undertaking this workforce reduction to reduce operating costs and so the Company can focus its resources on a restructured business model. The Company expects the majority of the reduction in its workforce to be completed by the end of the first quarter of 2013.

The Company expects to record a pre-tax charge of approximately $1.5 to $2.5 million in the fourth quarter of 2012 related to the restructuring plan. The Company estimates that future cash expenditures in connection with these restructuring actions will amount to approximately $2.3 million to $3.5 million, which is comprised of previously earned vacation as well as the aforementioned severance payments. The estimate of cash expenditures that the Company and its affiliates expect to incur and the pre-tax charge related thereto in connection with the workforce reduction is subject to a number of assumptions, and actual results may differ. The Company and its affiliates may also incur other charges not currently contemplated due to events that may occur as a result of, or associated with, the workforce reduction.

This item 2.05 contains “forward-looking” statements, including but not limited to statements with respect to the expected timing for completion of the restructuring plan and statements with respect to the expected impact and expense and costs to be incurred in connection with the restructuring plan. Any statements contained in this Item 2.05 that are not statements of historical fact may be deemed to be forward-looking statements. There are a number of important factors that could cause the results of the Company to differ materially from those indicated by these forward-looking statements, including, among others, risks and uncertainties related to the possibility that the Company may require more cash than anticipated for its operating or restructuring activities, the Company’s need to retain skilled employees and consultants, and other risks detailed from time to time in the Company’s SEC reports, including its Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2012, and other periodic filings with the SEC. The Company does not undertake any obligation to update or revise any forward-looking statements.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.