Washington, D.C. 20549


Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB Number: 3235-0287
Estimated average burden
hours per response: 0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*
Scarfo Anthony

(Last) (First) (Middle)


(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
Ribbon Communications Inc. [ RBBN ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director 10% Owner
X Officer (give title below) Other (specify below)
EVP & GM Cloud & Edge
3. Date of Earliest Transaction (Month/Day/Year)
4. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Commoon Stock 12/15/2020 M 2,499 A (1) 85,186 D
Common Stock 12/15/2020 F 608(2) D $6.2 84,578 D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Restricted Stock Units (1) 12/15/2020 M 2,499 (3) (3) Common Stock 2,499 $0 2,500 D
Explanation of Responses:
1. The RSUs convert into common stock on a one-for-one basis.
2. Payment of tax liability by delivering securities to the issuer incident to the vesting of a security.
3. 15,000 RSUs were granted on June 15, 2018 and vest over a three-year period as follows: one-third of the RSUs vested on June 15, 2019 and one-sixth of the RSUs vested on each of December 15, 2019, June 15, 2020 and December 15, 2020. The remaining one-sixth of the RSUs will vest on June 15, 2021.
Patrick Macken, Attorney-in-Fact 12/17/2020
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
                                                                                   EXHIBIT 24

                                     POWER OF ATTORNEY

      Know all by these presents, that the undersigned hereby constitutes and appoints each of

Patrick Macken and Bruce W. McClelland, signing singly, the undersigned's true and lawful

attorney-in-fact to:

(1) prepare, execute in the undersigned's name and on the undersigned's behalf, and submit to

the U.S. Securities and Exchange Commission (the "SEC") a Form ID, including amendments thereto,

and any other documents necessary or appropriate to obtain codes and passwords enabling the

undersigned to make electronic filings with the SEC of reports required by Section 16(a) of the

Securities Exchange Act of 1934 (the "Act") or any rule or regulation of the SEC;

(2) execute for and on behalf of the undersigned, in the undersigned's capacity as an officer

of Ribbon Communications Inc. (the "Company"), Forms 3, 4, and 5 in accordance with Section

16(a) of the Act and the rules thereunder, and any other forms or reports the undersigned may

be required to file in connection with the undersigned's ownership, acquisition, or disposition

of securities of the Company;

(3) do and perform any and all acts for and on behalf of the undersigned which may be necessary

or desirable to complete and execute any such Form 3, 4, or 5, or other form or report, and

timely file such form or report with the SEC and any stock exchange or similar authority; and

(4) take any other action of any type whatsoever in connection with the foregoing which, in the

opinion of such attorney-in-fact, may be of benefit to, in the best interest of, or legally requ-

ired by, the undersigned, it being understood that the documents executed by such attorney-in-fact

on behalf of the undersigned pursuant to this Power of Attorney shall be in such form and shall

contain such terms and conditions as such attorney-in-fact may approve in such attorney-in-fact's


      The undersigned hereby grants to each such attorney-in-fact full power and authority to do

and perform any and every act and thing whatsoever requisite, necessary, or proper to be done in

the exercise of any of the rights and powers herein granted, as fully to all intents and purposes

as the undersigned might or could do if personally present, with full power of substitution or

revocation, hereby ratifying and confirming all that such attorney-in-fact, or such attorney-in-

fact's substitute or substitutes, shall lawfully do or cause to be done by virtue of this power of

attorney and the rights and powers herein granted. The undersigned acknowledges that the foregoing

attorneys-in-fact, in serving in such capacity at the request of the undersigned, are not assuming,

nor is the Company assuming, any of the undersigned's responsibilities to comply with Section 16 of

the Act. This Power of Attorney shall remain in full force and effect until the undersigned is no

longer required to file Forms 3, 4, and 5 with respect to the undersigned's holdings of and transac-

tions in securities issued by the Company, unless earlier revoked by the undersigned in a signed

writing delivered to the foregoing attorneys-in-fact.

      IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of

this 17th day of December, 2020.

/s/ Anthony Scarfo


Anthony Scarfo