-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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<SEC-DOCUMENT>0001019056-10-000376.txt : 20100330
<SEC-HEADER>0001019056-10-000376.hdr.sgml : 20100330
<ACCEPTANCE-DATETIME>20100330100314
ACCESSION NUMBER:		0001019056-10-000376
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20100324
FILED AS OF DATE:		20100330
DATE AS OF CHANGE:		20100330

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Heslop Ryan
		CENTRAL INDEX KEY:			0001438751

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-30865
		FILM NUMBER:		10712414

	MAIL ADDRESS:	
		STREET 1:		C/O FIREFLY VALUE PARTNERS, LP
		STREET 2:		551 FIFTH AVENUE, 36TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10176

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Warszawski Ariel
		CENTRAL INDEX KEY:			0001438752

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-30865
		FILM NUMBER:		10712415

	MAIL ADDRESS:	
		STREET 1:		C/O FIREFLY VALUE PARTNERS, LP
		STREET 2:		551 FIFTH AVENUE, 36TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10176

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SOAPSTONE NETWORKS INC.
		CENTRAL INDEX KEY:			0001094895
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-PREPACKAGED SOFTWARE [7372]
		IRS NUMBER:				020493372
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		296 CONCORD ROAD
		STREET 2:		SUITE 308
		CITY:			BILLERICA
		STATE:			MA
		ZIP:			01821
		BUSINESS PHONE:		978 715-2337

	MAIL ADDRESS:	
		STREET 1:		296 CONCORD ROAD
		STREET 2:		SUITE 308
		CITY:			BILLERICA
		STATE:			MA
		ZIP:			01821

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	AVICI SYSTEMS INC
		DATE OF NAME CHANGE:	20000516

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			FVP US-Q LP
		CENTRAL INDEX KEY:			0001397671
		STATE OF INCORPORATION:			DE

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-30865
		FILM NUMBER:		10712416

	BUSINESS ADDRESS:	
		STREET 1:		C/O FVP GP LLC
		STREET 2:		551 FIFTH AVENUE, 36TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10176
		BUSINESS PHONE:		212-672-9600

	MAIL ADDRESS:	
		STREET 1:		C/O FVP GP LLC
		STREET 2:		551 FIFTH AVENUE, 36TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10176

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			FVP Master Fund LP
		CENTRAL INDEX KEY:			0001407275
		STATE OF INCORPORATION:			E9

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-30865
		FILM NUMBER:		10712417

	BUSINESS ADDRESS:	
		STREET 1:		FVP GP LLC
		STREET 2:		551 FIFTH AVENUE, 36TH FLOOR
		CITY:			New York
		STATE:			NY
		ZIP:			10176
		BUSINESS PHONE:		212-672-9600

	MAIL ADDRESS:	
		STREET 1:		FVP GP LLC
		STREET 2:		551 FIFTH AVENUE, 36TH FLOOR
		CITY:			New York
		STATE:			NY
		ZIP:			10176

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Firefly Value Partners, LP
		CENTRAL INDEX KEY:			0001438637
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-30865
		FILM NUMBER:		10712420

	BUSINESS ADDRESS:	
		STREET 1:		551 FIFTH AVENUE, 36TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10176
		BUSINESS PHONE:		212-672-9600

	MAIL ADDRESS:	
		STREET 1:		551 FIFTH AVENUE, 36TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10176

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			FVP GP, LLC
		CENTRAL INDEX KEY:			0001438718
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-30865
		FILM NUMBER:		10712418

	BUSINESS ADDRESS:	
		STREET 1:		C/O FIREFLY VALUE PARTNERS, LP
		STREET 2:		551 FIFTH AVENUE, 36TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10176
		BUSINESS PHONE:		212-672-9600

	MAIL ADDRESS:	
		STREET 1:		C/O FIREFLY VALUE PARTNERS, LP
		STREET 2:		551 FIFTH AVENUE, 36TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10176

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Firefly Management CO GP, LLC
		CENTRAL INDEX KEY:			0001438719
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-30865
		FILM NUMBER:		10712419

	BUSINESS ADDRESS:	
		STREET 1:		C/O FIREFLY VALUE PARTNERS, LP
		STREET 2:		551 FIFTH AVENUE, 36TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10176
		BUSINESS PHONE:		212-672-9600

	MAIL ADDRESS:	
		STREET 1:		C/O FIREFLY VALUE PARTNERS, LP
		STREET 2:		551 FIFTH AVENUE, 36TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10176
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2010-03-24</periodOfReport>

    <issuer>
        <issuerCik>0001094895</issuerCik>
        <issuerName>SOAPSTONE NETWORKS INC.</issuerName>
        <issuerTradingSymbol>SOAP</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001438637</rptOwnerCik>
            <rptOwnerName>Firefly Value Partners, LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>551 FIFTH AVE, 36TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10176</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001438719</rptOwnerCik>
            <rptOwnerName>Firefly Management CO GP, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>551 FIFTH AVE, 36TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10176</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001438718</rptOwnerCik>
            <rptOwnerName>FVP GP, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>551 FIFTH AVE, 36TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10176</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001407275</rptOwnerCik>
            <rptOwnerName>FVP Master Fund LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>551 FIFTH AVE, 36TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10176</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001397671</rptOwnerCik>
            <rptOwnerName>FVP US-Q LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>551 FIFTH AVE, 36TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10176</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001438752</rptOwnerCik>
            <rptOwnerName>Warszawski Ariel</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>551 FIFTH AVE, 36TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10176</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001438751</rptOwnerCik>
            <rptOwnerName>Heslop Ryan</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>551 FIFTH AVE, 36TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10176</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, par value $0.0001</value>
            </securityTitle>
            <transactionDate>
                <value>2010-03-24</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>7777</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>.755</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1541808</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By FVP Master Fund, L.P.</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, par value $0.0001</value>
            </securityTitle>
            <transactionDate>
                <value>2010-03-24</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>9723</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>.755</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1451481</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By FVP US-Q, LP</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, par value $0.0001</value>
            </securityTitle>
            <transactionDate>
                <value>2010-03-29</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>2222</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>.765</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1544030</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By FVP Master Fund, L.P.</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, par value $0.0001</value>
            </securityTitle>
            <transactionDate>
                <value>2010-03-29</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>2778</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>.765</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1454259</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By FVP US-Q, LP</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Firefly Value Partners, LP (&quot;Firefly Partners&quot;) serves as investment manager to FVP Master Fund, L.P. (the &quot;FVP Master Fund&quot;), the direct owner of the subject securities.  FVP GP, LLC (&quot;FVP GP&quot;) serves as the general partner of the FVP Master Fund and Firefly Management Company GP, LLC (&quot;Firefly Management&quot;) serves as the general partner of Firefly Partners.  Messrs. Ryan Heslop and Ariel Warszawski are the managing members of FVP GP and Firefly Management.  Each Reporting Person disclaims beneficial ownership of all securities reported herein, except to the extent of their pecuniary interest therein, if any, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the shares for purposes of Section 16 of the Securities Exchange Act of 1934 (&quot;Exchange Act&quot;) or for any other purpose.</footnote>
        <footnote id="F2">Firefly Partners serves as investment manager to FVP US-Q, LP (the &quot;FVP Fund&quot;), the direct owner of the subject securities.  FVP GP serves as the general partner of the FVP Fund and Firefly Management serves as the general partner of Firefly Partners.  Messrs. Ryan Heslop and Ariel Warszawski are the managing members of FVP GP and Firefly Management.  Each Reporting Person disclaims beneficial ownership of all securities reported herein, except to the extent of their pecuniary interest therein, if any, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the shares for purposes of Section 16 of the Exchange Act or for any other purpose.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Ariel Warszawski               Ariel Warszawski, for himself, as Managing
Member of FVP GP (for itself and as general
partner of the FVP Master Fund and the FVP Fund)
and of Firefly Management (for itself and as general
partners of Firefly Partners</signatureName>
        <signatureDate>2010-03-30</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Ryan Heslop</signatureName>
        <signatureDate>2010-03-30</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----