Filing Details

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1 )* ZOOM TELEPHONICS, INC. (Name of Issuer) COMMON STOCK (Title of Class of Securities) 98978K107 (CUSIP Number) May 15, 2018 (Date of Event Which Requires Filing of This Statement) Check the Appropriate box to designate the rule pursuant to which this Schedule is filed: [ ] Rule 13d-1(b) [x ] Rule 13d-1(c) [ ] Rule 13d-1(d) * The remainder of this cover page shall be filled out for a reporting persons initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page. The information required in the remainder of this cover page shall not be deemed to be filed for the purpose of Section 18 of the Securities Exchange Act of 1934 (Act) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No. 98978K107 1. Names of Report Persons SF Investors LP 13-3793258 2. Check the Appropriate Box if a Member of a Group (a) [ ] (b) [ ] 3. SEC Use Only 4. Citizenship or Place of Organization United States 5. Sole Voting Power Number of Shares 408,258 Beneficially 6. Shared Voting Power Owned by 0 Each Reporting 7. Sole Dispositive Power Person with 408,258 8. Shared Dispositive Power 0 9. Aggregate Amount Beneficially Owned by Each Reporting Person 408,258 10. Check if Aggregate Amount in Row (9) Excludes Certain Shares(See Inst). [ ] 11. Percent of Class Represented by Amount in Row (9) 2.57% 12. Type of Reporting Person (See Instructions) PNItem 1. (a) Name of Issuer Zoom Telephonics, Inc. (b) Address of Issuers Principal Executive Offices 99 High Street Boston, MA 02110 Item 2. (a) Name of Person Filing SF Investors LP (b) Address of Principal Business Office or, if None, Residence 8 South Acres Road Plattsburgh, NY 12901-3719 (c) Citizenship United States (d) Title of Class of Securities Common Stock (e) CUSIP Number 98978K107 Item 3. If This Statement is Filed Pursuant to Rule 13d- 1(b), or 13d-2(b) or (c), Check Whether the Person Filing is a: (a) [ ] Broker or dealer registered under Section 15 of the Act (15 U.S.C. 78o). (b) [ ] Bank as defined in Section 3(a)(6) of the Act (15 U.S.C. 78c). (c) [ ] Insurance Company as defined in Section 3(a)(19) of the Act (15 U.S.C. 78c). (d) [ ] Investment Company registered under section 8 of the Investment Co. Act of 1940 (15 U.S.C. 80a- 8). (e) [ ] An investment advisor in accordance with Rule 240.13d-1(b)(1)(ii)(E); (f) [ ] An employee benefit plan or endowment fund in Accordance with Rule 240.13d- 1(b)(1)(ii)(F); Item 3. (cont.) (g) [ ] A parent holding company or control person in accordance With Rule 240-13d-1(b)(1)(ii)(G); (h) [ ] A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813; (i) [ ] A church plan that is excluded from the definition of an Investment company under Section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3); (j) [ ] Group, in accordance with Rule 240.13d- 1(b)(1)(ii)(J). If this statement is filed pursuant to Rule 13d-1(c), check this box [] Not Applicable Item 4. Ownership Provide the following information regarding the aggregate number and percentage of the class of the issuer identified in Item 1. (a) Amount Beneficially Owned: SF Investors LP, in its capacity as owner, may be deemed to beneficially own 408,258 shares of the Issuer. (b) 2.57% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote: (ii) shared power to vote or to direct the vote 0 (iii) sole power to dispose or direct disposition of 408,258 (iv) shared power to dispose or direct disposition of 0 Item 5. Ownership of Five Percent or Less of Class. If this statement is being filed to report the fact that as of the date hereof Reporting person has ceased to be the beneficial owner of more than five Percent of the class of securities, check the following: [ X ] Item 6. Ownership of More than Five Percent on Behalf of Another Person. Not Applicable Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company. Not Applicable Item 8. Identification and Classification of Member of the Group. Not Applicable Item 9. Notice of Dissolution of Group. Not Applicable Item 10. Certification. By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transactions having that purpose or effect. SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. By: ______________________________________ Name: Stuart Friedman Title: General Partner Date: May 15, 2018