Exhibit 10.27

AMENDMENT NO. 4 TO

CREDIT AGREEMENT

AMENDMENT NO. 4, dated as of May 31, 2012 (this “Fourth Amendment”), to the Credit Agreement, dated as of August 23, 2006 (as amended, amended and restated, supplemented or otherwise modified from time to time, the “Credit Agreement”), among BROADVIEW NETWORKS HOLDINGS, INC., a Delaware corporation (“Holdings”), BROADVIEW NETWORKS, INC., a Delaware corporation (“Broadview Networks”), BROADVIEW NETWORKS OF MASSACHUSETTS, INC., a Delaware corporation (“Broadview MA”), BROADVIEW NETWORKS OF VIRGINIA, INC., a Virginia corporation (“Broadview VA”), BRIDGECOM INTERNATIONAL, INC., a Delaware corporation (“Bridgecom International” and, together with Holdings, Broadview Networks, Broadview MA, Broadview VA, and Bridgecom International, the “Borrowers”), the various financial institutions and other Persons from time to time parties thereto (collectively, the “Lenders”), and THE CIT GROUP/BUSINESS CREDIT, INC. (“CIT”), as administrative agent (in such capacity, the “Administrative Agent”), collateral agent, and documentation agent for the Lenders.

BACKGROUND

The Borrowers, the Lenders, and the Administrative Agent are parties to the Credit Agreement, as amended by (i) that certain Amendment No. 1 dated as of July 27, 2007, (ii) that certain Amendment No. 2 dated as of November 12, 2010, and (iii) that certain Amendment No. 3 dated as of December 8, 2011 (as in effect prior to this Fourth Amendment, the “Existing Credit Agreement” and as amended hereby and from time to time hereafter, the “Credit Agreement”).

Immediately prior to the execution and delivery of this Fourth Amendment, (i) Jefferies Finance LLC (“Jefferies”) (in its capacity as a Lender), as assignor, and CIT (in its capacity as a Lender), as assignee, entered into an Assignment and Assumption of even date herewith (the “Jefferies Assignment”), pursuant to which Jefferies assigned to CIT 100% of Jefferies’ Assigned Interests (as defined in the Jefferies Assignment) and thereby ceased to be a Lender under the Existing Credit Agreement, and (ii) Jefferies & Company, Inc. resigned as Syndication Agent and has not been replaced.

The Borrowers have requested that the Administrative Agent and the Lenders extend the Maturity Date under and further amend the Existing Credit Agreement, all as more fully set forth herein.

The Administrative Agent and the Lenders are amenable to the foregoing requests, all as more fully set forth and on the terms and conditions contained herein.

NOW THEREFORE, in consideration of the mutual promises and agreements contained herein and other good and valuable consideration, the receipt and adequacy of which are hereby acknowledged, each of the parties hereto hereby agrees as follows:

Each defined term used herein and not otherwise defined herein shall have the meaning ascribed to such term in the Existing Credit Agreement.

2.1 Amendment and Addition of Certain Defined Terms. Section 1.1 of the Existing Credit Agreement shall be amended to (a) add the following new defined terms: “Fourth Amendment”, “Fourth Amendment Effective Date”, and “Senior Note Refinancing Reserve”, and (b) amend and restate the following defined terms: “Additional Reserves”, and “Maturity Date”, all of which are deemed inserted in their proper alphabetical order, as set forth below:

“Additional Reserves” means (i) the Senior Note Refinancing Reserve and (ii) such reserves as the Administrative Agent may reasonably deem proper and necessary from time to time (but without duplication of exclusions of Receivables (or portions of Receivables) or other amounts from the Borrowing Base Amount pursuant to the definition of “Eligible Receivables” in this Article I.

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“Fourth Amendment” means that certain Fourth Amendment to Credit Agreement, dated on or about May 31, 2012, among the Administrative Agent, the Lenders and the Borrowers.

“Fourth Amendment Effective Date” has the meaning assigned thereto in the Fourth Amendment.

“Maturity Date” means the earliest to occur of (a) August 1, 2012, (b) the date that the Revolving Credit Commitment is reduced to $0 pursuant to Section 2.5, or (c) the date of termination of the Revolving Credit Commitment by the Administrative Agent on behalf of the Lenders pursuant to Section 10.2(a).

“Senior Note Refinancing Reserve” means such amount to be included within Additional Reserves, determined and subject to automatic adjustment from time to time, as may be necessary to insure that from and after the Fourth Amendment Effective Date and continuing until the Maturity Date, the aggregate amount of all outstanding Revolving Credit Loans may not at any time exceed $14,000,000.

2.2 Field Examination Reimbursement. Notwithstanding anything contained in the Credit Agreement to the contrary and without in any way limiting the Administrative Agent’s right to reimbursement for (or payment by the Borrowers of) collateral audits and field examinations to the extent contemplated by Section 12.3 thereof or otherwise, the Borrowers will be responsible to pay all costs and expenses incurred by the Administrative Agent in connection with collateral appraisals, collateral audits and field examinations performed or to be performed in connection with this Fourth Amendment and hereafter from time to time through and including the Maturity Date, as determined by and in the discretion of the Administrative Agent.

2.3 Waiver of Certain Trigger Event. Commencing on the Fourth Amendment Effective Date and continuing thereafter through and until the Maturity Date, so long as no Default or Event of Default shall have occurred, the Administrative Agent agrees that the event described in clause (c) of the definition of “Trigger Event” set forth in the Credit Agreement shall not be deemed a Trigger Event and as such its occurrence shall not result in the commencement of a Trigger Period.

3.1 Release. In consideration of, among other things, the Lenders’ execution and delivery of this Fourth Amendment, each of the Credit Parties, on behalf of itself and its successors and assigns (collectively, “Releasors”), hereby forever waives, releases and discharges to the fullest extent permitted by law, and hereby agrees to hold each Releasee (as defined below) harmless from, any and all claims (including, without limitation, crossclaims, counterclaims, rights of set-off and recoupment), causes of action, demands, suits, costs and expenses, and damages (collectively, the “Claims”), that any Releasor now has or hereafter may have, of whatsoever nature and kind, whether known or unknown, whether now existing or hereafter arising, whether arising at law or in equity, against the Administrative Agent, the Lenders and their respective affiliates, shareholders and “controlling persons” (within the meaning of the federal securities laws), and their respective successors and assigns and each and all of the officers, directors, employees, consultants, agents, attorneys and other representatives of each of the foregoing (collectively, the “Releasees”), based in whole or in part on facts, whether or not now known, existing on or before the execution of this Fourth Amendment; provided that (a) such release shall only relate to Claims arising directly and primarily from or relating directly and primarily to the Loan Documents and (b) such release shall not apply to Claims resulting from the gross negligence or willful misconduct of the Releasee relating directly and primarily to the Loan Documents. In entering into this Fourth Amendment, each of the Credit Parties, has consulted with, and been represented by, legal counsel and expressly disclaims any reliance on any representations, acts or omissions by

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any of the Releasees and hereby agree and acknowledge that the validity and effectiveness of the releases set forth above do not depend in any way on any such representations, acts and/or omissions or the accuracy, completeness or validity hereof. The provisions of this Section 3.1 shall survive the termination of the Credit Agreement and the other Loan Documents and payment in full of the Obligations.

3.2 Indemnity. Each of the Credit Parties, hereby agrees that its obligation to indemnify and hold the Releasees harmless as set forth in the immediately preceding Section 3.1, shall include an obligation to indemnify and hold Releasees harmless with respect to any and all liabilities, obligations, losses, penalties, actions, judgments, suits, costs, expenses (including, without limitation, reasonable attorney’s fees and expenses) or disbursements of any kind or nature whatsoever incurred by the Releasees, or any of them, whether direct, indirect or consequential, as a result of or arising from or relating to any proceeding by, or on behalf of any Person, including, without limitation, the respective officers, directors, agents, trustees, creditors, partners or shareholders of any of the Credit Parties, whether threatened or initiated, asserting any claim for legal or equitable remedy under any statute, regulation or common law principle arising from or in connection with the negotiation, preparation, execution, delivery, performance, administration and enforcement of this Fourth Amendment or any other document executed in connection herewith; provided that none of the Credit Parties, shall have any indemnification obligation to any Releasee pursuant to this Section with respect to liabilities to the extent resulting from the gross negligence or willful misconduct of any Releasee. If and to the extent that the foregoing undertaking is adjudged by a final judicial determination to be unenforceable for any reason, each of the Credit Parties jointly and severally agrees to make the maximum contribution to the payment and satisfaction thereof which is permissible under applicable law. The foregoing indemnity shall survive the termination of the Credit Agreement and the other Loan Documents and the payment in full of the Obligations.

3.3 Ratification of Liability. Subject to the terms of the Credit Agreement and this Fourth Amendment, each of the Credit Parties, as debtors, grantors, pledgors, guarantors, assignors, or in other similar capacities in which such Person grants liens or security interests in its properties or otherwise act as accommodation parties or guarantors, as the case may be, hereby ratifies and reaffirms all of its payment and performance obligations, contingent or otherwise, under each of the Loan Documents (as amended hereby) to which it is a party (including, without limitation, the obligation to pay interest at the rate of interest contemplated by Section 4.1(c) of the Credit Agreement on account of Events of Default heretofore occurring, currently pending or hereafter arising) and, to the extent such Credit Party granted liens on or security interests in any of its properties pursuant to any such Loan Document as security for or otherwise guaranteed any or all Obligations under or with respect to the Loan Documents, each of the Credit Parties hereby ratifies and reaffirms such guarantee and grant of security interests and liens and confirms and agrees that such security interests and liens hereafter secure all of the Obligations as amended hereby. Each of the Credit Parties hereby consents to this Fourth Amendment. Except as otherwise provided herein, the execution of this Fourth Amendment shall not operate as a waiver of any right, power or remedy of the Lender, constitute a waiver of any provision of any of the Loan Documents or serve to effect a novation of the Obligations.

Each of the Borrowers hereby represents and warrants to the Administrative Agent and the Lenders as follows:

4.1 The Fourth Amendment. The execution, delivery and performance by each Credit Party of this Fourth Amendment, (i) have been duly authorized by all necessary action, and (ii) do not and will not contravene its charter or by-laws, its limited liability company or operating agreement or its certificate of partnership or partnership agreement, as applicable, or any applicable law or any contractual restriction binding on or otherwise affecting it or any of its properties. This Fourth Amendment has been duly and validly executed by an authorized executive officer of each of the Borrowers and constitutes the legal, valid and binding obligation of each of the Borrowers enforceable against each of the Borrowers in accordance with its terms. The Credit Agreement, as amended by this Fourth Amendment, remains in full force and effect and is the valid and binding obligation of each of the Borrowers enforceable against each of the Borrowers in accordance with its terms. Each of the Borrowers hereby ratifies and confirms the Credit Agreement, as amended by this Fourth Amendment.

4.2 No Default or Event of Default. No Default or Event of Default has occurred or now exists under the Credit Agreement, as amended by and after giving effect to this Fourth Amendment, and no Default or Event of Default will occur as a result of the effectiveness of this Fourth Amendment.

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4.3 Solvency. After giving effect to the consummation of the transactions contemplated in this Fourth Amendment and the other Loan Documents, and excepting the obligation of the Borrowers to discharge all amounts due in respect of the Senior Secured Notes on or about September 1, 2012, the Credit Parties on a consolidated basis are Solvent.

4.4 Restatement of Representations and Warranties. The representations and warranties of each of the Borrowers contained in the Credit Agreement, as amended by and after giving effect to this Fourth Amendment, and the other Loan Documents are true and correct on and as of the date of this Fourth Amendment as though made on the date of this Fourth Amendment, it being understood and agreed that any representation or warranty which by its terms was made as of a specified date shall be required to be true and correct only as of such specified date; provided, however that during the period from and after the Fourth Amendment Effective Date through and until the Maturity Date, the representation and warranty of the Borrowers set forth in Section 6.1(q) of the Credit Agreement shall be deemed to be made excepting the obligation of the Borrowers to discharge all amounts due in respect of the Senior Secured Notes on or about September 1, 2012.

4.5 Special Representation and Warranty Regarding Deposit Accounts. The Borrowers represent and warrant to the Administrative Agent and the Lenders that the Administrative Agent has received control agreements, duly authorized, executed and delivered among the applicable Credit Parties, the Administrative Agent and the applicable depositary bank, as required by (but with such exceptions as are provided in) the Collateral Agreement, each in form and substance satisfactory to the Administrative Agent.

The date and time of the effectiveness of this Fourth Amendment (the “Fourth Amendment Effective Date”) is subject to the satisfaction of each and all of the following conditions precedent (unless waived in writing by the Administrative Agent and the Lenders):

5.1 Loan Documents. The Administrative Agent shall have received an executed copy of (i) the Jefferies Assignment, (ii) this Fourth Amendment, and (iii) Secretary’s Certificate(s) with respect to the Credit Parties, confirming the due authorization of the transactions contemplated by the Fourth Amendment, together with copies of the authorizing resolutions, all in form and substance satisfactory to the Administrative Agent.

5.2 Prepayment of Obligations. The Administrative Agent shall have received a payment against and in reduction of the Revolving Credit Loans, in an amount not less than the aggregate Extensions of Credit of Jefferies Finance LLC outstanding immediately prior to the Jefferies Assignment.

5.3 Other. All corporate and other proceedings, and all documents, instruments and other legal matters in connection with the transactions contemplated by this Fourth Amendment shall be satisfactory in form and substance to the Administrative Agent and its counsel.

5.4 Amendment Fee. Borrowers shall pay to Administrative Agent for its sole benefit, an amendment fee in the amount of Two Hundred Fifty Thousand Dollars ($250,000.00) (the “Fourth Amendment Fee”), which shall be deemed fully earned and immediately due and payable upon the execution of this Fourth Amendment and which shall be paid either directly by Borrowers or by the Administrative Agent’s making a Revolving Credit Loan and retaining the proceeds in satisfaction of such Fourth Amendment Fee; provided, however, that so long as from and after the Fourth Amendment Effective Date no Default or Event of Default shall have occurred, if and to the extent that CIT is a lender in a transaction to refinance or replace the credit accommodations set forth in the Credit Agreement, CIT agrees that up to one half of such Fourth Amendment Fee may be credited against and in reduction of (but not to exceed) the closing facility fee otherwise payable to CIT on the closing date under or in connection with such refinancing transaction. The foregoing undertaking by CIT with respect to the Fourth Amendment Fee shall not be construed to create any obligation or commitment by CIT to extend or participate in any new financing, refinancing or other credit accommodations whatsoever to the Borrowers, beyond the terms of the Credit Agreement and the failure or refusal by CIT for any or no reason to extend or participate in any such new financing, refinancing or other credit accommodations shall not in any way oblige CIT to return any portion of the Fourth Amendment Fee to Borrowers.

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In order to induce the Administrative Agent and the Lenders to enter into this Fourth Amendment and to provide the accommodations set forth herein, and in consideration of such accommodations, each Guarantor hereby: (i) consents to the provisions of this Fourth Amendment; (ii) confirms, agrees and certifies that as of the date of this Fourth Amendment (a) such Guarantor’s obligations under the Guaranty Agreement and the Collateral Agreement, relating to the Guaranteed Obligations (as defined in the Guaranty Agreement) and/or the Obligations, as amended by this Fourth Amendment shall be unimpaired hereby, (b) such Guarantor has no defenses or set-offs against the Administrative Agent or the Lenders, or any of their officers, directors, employees, agents or attorneys with respect to its Guaranty, (c) all of the terms, conditions and covenants in the Guaranty Agreement remain unaltered and in full force and effect and are hereby ratified and confirmed; (iii) reaffirms the Guaranty Agreement in accordance with its terms; (iv) acknowledges that the Guaranty Agreement extends to each and every obligation due and owing from the Borrowers to the Administrative Agent and the Lenders under the Credit Agreement; (vi) certifies that as of the date of this Fourth Amendment all of the representations and warranties made in the Guaranty Agreement and the Collateral Agreement are true and correct in all material respects; and (vii) ratifies and confirms the indemnification and waiver of jury trial provisions contained in the Guaranty Agreement and the Collateral Agreement

7.1 Governing Law. This Fourth Amendment shall be governed by and construed and enforced in accordance with the laws of the State of New York without giving effect to the conflict of laws rules thereof.

7.2 Severability. Any provision of this Fourth Amendment which is prohibited or unenforceable shall be ineffective to the extent of such prohibition or unenforceability without invalidating the remaining provisions of this Fourth Amendment.

7.3 Counterparts. This Fourth Amendment may be executed in any number of counterparts and by different parties hereto and separate counterparts, each of which when so executed and delivered shall be deemed to be an original, and all of which taken together shall constitute but one and the same instrument.

7.4 Headings. Section headings used in this Fourth Amendment are for the convenience of reference only and are not a part of this Agreement for any other purpose.

7.5 Negotiations. The Credit Parties acknowledge and agree that all of the provisions contained herein were negotiated and agreed to in good faith after discussion with the Administrative Agent and the Lenders.

7.6 Non-waiver. Except as otherwise provided in this Fourth Amendment, the execution, delivery, performance and effectiveness of this Fourth Amendment shall not operate as, or be deemed or construed to be, a waiver: (i) of any right, power or remedy of the Lenders or the Administrative Agent under the Credit Agreement or the other Loan Documents, or (ii) of any term, provision, representation, warranty or covenant contained in the Credit Agreement or any other Loan Document. Further, none of the provisions of this Fourth Amendment shall constitute, be deemed to be or construed as, a waiver of any Default or Event of Default under the Credit Agreement, except as provided by this Fourth Amendment.

7.7 Reference to and Effect on the Credit Agreement. Upon the effectiveness of this Fourth Amendment, each reference in the Credit Agreement to “this Agreement,” “hereunder,” “hereof,” “herein,” or words of like import shall mean and be a reference to the Credit Agreement as amended by this Fourth Amendment and each reference to the Credit Agreement in any other document, instrument or agreement executed and/or delivered in connection with the Credit Agreement shall mean and be a reference to the Credit Agreement, as amended by this Fourth Amendment.

7.8 Further Assurances. The Borrowers agree that they will, promptly upon the request of the Administrative Agent, make, execute and deliver all such additional and further acts, things, deeds and instruments as the Administrative Agent or the Required Lenders (through the Administrative Agent) may reasonably require to

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document and consummate the transactions contemplated hereby and to vest completely in and insure the Administrative Agent and the Lenders their respective rights under the Credit Agreement and the other Loan Documents.

IN WITNESS WHEREOF, the parties hereto have caused this Fourth Amendment to be duly executed by their respective officers or Administrative Agent thereunto duly authorized as of the date first written above.

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