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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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<SEC-DOCUMENT>0000950138-05-000475.txt : 20050611
<SEC-HEADER>0000950138-05-000475.hdr.sgml : 20050611
<ACCEPTANCE-DATETIME>20050526213458
ACCESSION NUMBER:		0000950138-05-000475
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050524
FILED AS OF DATE:		20050526
DATE AS OF CHANGE:		20050526

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			TEKELEC
		CENTRAL INDEX KEY:			0000790705
		STANDARD INDUSTRIAL CLASSIFICATION:	RADIO & TV BROADCASTING & COMMUNICATIONS EQUIPMENT [3663]
		IRS NUMBER:				952746131
		STATE OF INCORPORATION:			CA
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		26580 W AGOURA RD
		CITY:			CALABASAS
		STATE:			CA
		ZIP:			91302
		BUSINESS PHONE:		8188805656

	MAIL ADDRESS:	
		STREET 1:		26580 W AGOURA RD
		CITY:			CALABASAS
		STATE:			CA
		ZIP:			91302

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Stirling Trustees Limited, as Trustee of The Natinec Trust under The Natinec Settlement Trust Deed dated January 9, 2003
		CENTRAL INDEX KEY:			0001310115

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-15135
		FILM NUMBER:		05861475

	BUSINESS ADDRESS:	
		STREET 1:		VICTORIA CHAMBERS
		STREET 2:		1-3 ESPLANADE
		CITY:			ST. HELIER, JERSEY CHANNEL ISL
		STATE:			XX
		ZIP:			JE4 0SZ
		BUSINESS PHONE:		011-44-1534-877-500

	MAIL ADDRESS:	
		STREET 1:		P. O. BOX 801
		STREET 2:		VICTORIA CHAMBERS, 1-3 ESPLANADE
		CITY:			ST. HELIER, JERSEY CHANNEL ISL
		STATE:			XX
		ZIP:			JE4 0SZ

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			NATINCO S A
		CENTRAL INDEX KEY:			0001214764
		STATE OF INCORPORATION:			N4

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-15135
		FILM NUMBER:		05861476

	BUSINESS ADDRESS:	
		STREET 1:		5, BOULEVARD DE LA FOIRE
		CITY:			L-1528 LUXEMBOURG
		STATE:			N4
		ZIP:			00000
		BUSINESS PHONE:		011 352 45 123 1

	MAIL ADDRESS:	
		STREET 1:		5, BOULEVARD DE LA FOIRE
		CITY:			L-1528 LUXEMBOURG
		STATE:			N4
		ZIP:			00000
</SEC-HEADER>
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<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-05-24</periodOfReport>

    <issuer>
        <issuerCik>0000790705</issuerCik>
        <issuerName>TEKELEC</issuerName>
        <issuerTradingSymbol>TKLC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001214764</rptOwnerCik>
            <rptOwnerName>NATINCO S A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>5, BOULEVARD DE LA FOIRE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>L-1528 LUXEMBOURG</rptOwnerCity>
            <rptOwnerState>N4</rptOwnerState>
            <rptOwnerZipCode></rptOwnerZipCode>
            <rptOwnerStateDescription>LUXEMBOURG</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001310115</rptOwnerCik>
            <rptOwnerName>Stirling Trustees Limited, as Trustee of The Natinec Trust under The Natinec Settlement Trust Deed dated January 9, 2003</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>P.O. BOX 801</rptOwnerStreet1>
            <rptOwnerStreet2>28-30 THE PARADE</rptOwnerStreet2>
            <rptOwnerCity>ST HELIER, JERSEY CHANNEL ISL</rptOwnerCity>
            <rptOwnerState></rptOwnerState>
            <rptOwnerZipCode>JE4 0SZ</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</value>
            </securityTitle>
            <transactionDate>
                <value>2005-05-24</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>X</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>77600</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>12.15</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>8875136</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F2"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2005-05-26</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>X</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F3"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>73836</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>12.53</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>8801300</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F2"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Contract to Sell (Prepaid Variable Forward Contract)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2005-05-24</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>X</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>110000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2005-05-24</value>
            </exerciseDate>
            <expirationDate>
                <value>2005-05-24</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>110000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F2"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Contract to Sell (Prepaid Variable Forward Contract)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F3"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2005-05-26</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>X</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F3"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>110000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2005-05-26</value>
            </exerciseDate>
            <expirationDate>
                <value>2005-05-26</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>110000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F2"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">On May 24, 2005, Natinco, S.A. (&quot;Natinco&quot;) settled its obligation to deliver shares of Tekelec Common Stock under a prepaid forward sale contract entered into with an unaffiliated third party buyer (the &quot;Buyer&quot;) on May 7, 2003 pursuant to a Rule 10b5-1 trading plan adopted by Natinco.

Pursuant to the contract, on or about May 16, 2003, Natinco received a cash payment in the total amount of $942,544.52.  In exchange for the cash payment, Natinco pledged and agreed to deliver to the Buyer on May 24, 2005 up to 110,000 shares of Tekelec Common Stock.  The number of shares to be delivered by Natinco to the Buyer at settlement depended upon the price of Tekelec Common Stock on May 24, 2005 (the &quot;Settlement Price&quot;) as follows:  (i) if the Settlement Price were less than or equal to $9.2696 per share, then Natinco would be required to deliver all 110,000 shares to the Buyer; (ii) if the Settlement Price were greater than $9.2696 but less than $16.2218 per share, then Natinco would be required to deliver a number of shares equal to the product of 110,000 times $9.2696, divided by the Settlement Price; and (iii) if the Settlement Price were greater than $16.2218, then Natinco would be required to deliver a number of shares equal to 110,000 multiplied by a fraction, the numerator of which
 would be the sum of $9.2696 plus the difference between the Settlement Price and $16.2218, and the denominator of which would be the Settlement Price.  In lieu of the delivery of shares, Natinco also had the option to settle the contract by the delivery of cash.

The Settlement Price upon settlement of the contact on May 24, 2005 was $13.14.  Accordingly, Natinco transferred 77,600 shares and retained and was not required to deliver 32,400 shares.</footnote>
        <footnote id="F2">These securities were or are owned (i) directly by Natinco and (ii) indirectly by Stirling Trustees Limited, as trustee of the Natinec Trust under The Natinec Settlement Trust Deed dated January 9, 2003 (the &quot;Natinec Trust&quot;).  The Natinec Trust owns substantially all of the equity interest in Natinco.</footnote>
        <footnote id="F3">On May 26, 2005, Natinco, S.A. (&quot;Natinco&quot;) settled its obligation to deliver shares of Tekelec Common Stock under a prepaid forward sale contract entered into with an unaffiliated third party buyer (the &quot;Buyer&quot;) on May 7, 2003 pursuant to a Rule 10b5-1 trading plan adopted by Natinco.

Pursuant to the contract, on or about May 20, 2003, Natinco received a cash payment in the total amount of $924,811.31.  In exchange for the cash payment, Natinco pledged and agreed to deliver to the Buyer on May 26, 2005 up to 110,000 shares of Tekelec Common Stock.  The number of shares to be delivered by Natinco to the Buyer at settlement depended upon the price of Tekelec Common Stock on May 26, 2005 (the &quot;Settlement Price&quot;) as follows:  (i) if the Settlement Price were less than or equal to $9.0952 per share, then Natinco would be required to deliver all 110,000 shares to the Buyer; (ii) if the Settlement Price were greater than $9.0952 but less than $15.9166 per share, then Natinco would be required to deliver a number of shares equal to the product of 110,000 times $9.0952, divided by the Settlement Price; and (iii) if the Settlement Price were greater than $15.9166, then Natinco would be required to deliver a number of shares equal to 110,000 multiplied by a fraction, the numerator of which
 would be the sum of $9.0952 plus the difference between the Settlement Price and $15.9166, and the denominator of which would be the Settlement Price.  In lieu of the delivery of shares, Natinco also had the option to settle the contract by the delivery of cash.

The Settlement Price upon settlement of the contact on May 26, 2005 was $13.55.  Accordingly, Natinco transferred 73,836 shares and retained and was not required to deliver 36,164 shares.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Pierre Lentz, as a Director of Natinco, S.A.</signatureName>
        <signatureDate>2005-05-26</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>John Seil, as a Director of Natinco, S.A.</signatureName>
        <signatureDate>2005-05-26</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Paul W. Elliott, as Director of Stirling Trustees Limited, Trustee of the Natinec Trust under The Natinec Settlement Trust Deed dated January 9, 2003</signatureName>
        <signatureDate>2005-05-26</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----