YZZGRP2670V2IP Phone

1/1 US Agent for Service of Process LETTER OF ATTESTATION TO: Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 US Agent for Service of Process: Company Name: Grandstream Networks, Inc. FRN: 0020352431 Contact Name: Ning Wei Address: 126 Brookline Ave., 3rd Floor Boston, MA 02215, USA Telephone No: +1 617-566-9300 Email: [email protected] Applicant: Company name: Grandstream Networks, Inc. Product Description: IP Phone Grantee code: YZZ FCC ID: YZZGRP2670V2 FRN：0020352431 Contact Name: Ning Wei Address: 126 Brookline Ave., 3rd Floor Boston, MA 02215, USA Telephone No: +1 617-566-9300 Email: [email protected] [Grandstream Networks, Inc.] certifies that, as of the date of this filing of the application with the TCB, [Grandstream Networks, Inc.] is our designated US agent for service of process for the above referenced FCC ID. [Grandstream Networks, Inc.] accepts to maintain an agent for no less than one year after the grantee has terminated all marketing and importation or the conclusion of any commission related proceeding involving equipment. [Grandstream Networks, Inc.] accepts, as of the date of the filing of the application, the obligation of the designated US agent for service of process for the above reference FCC ID. The US Agent for Service of Process is aware of and agrees to comply with the requirements outlined in the FCC Equipment Authorization Program, Report and Order FCC 22-84, and clause § 2.911. The Applicant is aware of and agrees to comply with the requirements outlined in the FCC Equipment Authorization Program, Report and Order FCC 22-84, and clause § 2.911. Date:2024/07/03 Applicant’s Name: Ning Wei US Agent’s Name: Ning Wei Title: Manager Title: President Manage Signature Signature

C5266091_X24_Ed.2 1/1 “Attestation Statements” TO: Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 The Commission adopted rules that prohibit equipment authorization for “covered” telecommunications equipment and video surveillance equipment produced by entities identified on the Commission’s Covered List 1 , which is periodically updated. See the Covered List for more details. This Attestation Statement is to confirm that we follow the Section 2.911(d)(5)(i)-(ii) Applicant Company name: Grandstream Networks, Inc. Grantee code: YZZ FRN: 0020352431 FCC ID: YZZGRP2670V2 Contact Name: Ning Wei Address: 126 Brookline Ave., 3rd Floor Boston, MA 02215, USA Telephone No: +1 617-566-9300 Fax No: N/A Email: [email protected] i. [Grandstream Networks, Inc.] (“the applicant”) certifies that the equipment for which authorization is sought is not “covered” equipment prohibited from receiving an equipment authorization pursuant to section 2.903 of the FCC rules. The applicant must sign this certification. ii. [Grandstream Networks, Inc.] (“the applicant”) certifies that, as of the date of the filing of the application, the applicant [ is not] (as a specifically named entity or any of its subsidiaries or affiliates) identified on the Covered List as an entity producing “covered” equipment. The applicant must sign this certification. [Grandstream Networks, Inc.]] (“the applicant”) certifies that, as of the date of the filing of the application, the applicant [is not] identified on the Covered List as an entity producing “covered” equipment . Date:2024/07/03 Applicant’s Name: Ning Wei Title: Manager Signature 1 The Commission’s Covered List is published by the Public Safety and Homeland Security Bureau and posted on the Commission’s website. This Covered List, which is periodically updated, identifies particular equipment, produced by particular entities, that constitutes “covered” equipment. https://www.fcc.gov/supplychain/coveredlist

C5266091_X8_Ed.1 1/1 Grandstream Networks, Inc. 126 Brookline Ave., 3rd Floor Boston, MA 02215, USA Letter of Authorization Company: Grandstream Networks, Inc. Address: 126 Brookline Ave., 3rd Floor Boston, MA 02215, USA Model Number: GRP2670 FCC Identifier: YZZGRP2670V2 We authorize LGAI Technological Center S.A., Ronda de la Font del Carme, s/n, 08193 Bellaterra, Spain, to act on our behalf on all matters concerning the above named equipment. Any individual within LGAI Technological Center S.A. is authorized to act on our behalf and take action on the application. We declare that authorize LGAI Technological Center S.A., Ronda de la Font del Carme, s/n, 08193 Bellaterra, Spain, is allowed to forward all information related to the approval project to the Federal Communication Commission and to discuss any issues concerning the approval application. Any and all acts carried out by LGAI Technological Center S.A. on our behalf shall have the same effect as acts of our own. Name: Ning Wei Date: July 03, 2024 Title: Manager Signature of applicant:

C5266091_X10_Ed.1 1/1 Grandstream Networks, Inc. 126 Brookline Ave., 3rd Floor Boston, MA 02215, USA Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 Date: July 03, 2024 Subject: Request for Confidentiality FCC ID: YZZGRP2670V2 To Whom It May Concern, Pursuant to the provisions of Sections 0.457 and 0.459 of Commission's rules (47CFR0.457, 0.459), we are requesting the Commission to withhold the following attachment(s) as confidential document from public disclosure. Exhibits Long-Term Confidentiality Short-Term Confidentiality ID Label/Location No No Attestation Statement No No External Photos No Block Diagram Schematics Test Report No No Test Setup Photos No User’s Manual Internal Photos Operational Description Cover Letter(s) No No SDR Software / Security Info No NOTE 1: Long-Term Confidentiality may be permitted under special conditions (See II. LONG-TERM CONFIDENTIALITY, Section 3 of KDB 726920, use last in force) NOTE 2: Short-Term Confidentiality can be requested for a maximum of 180 days from the date of the grant. Above mentioned document contains detailed system and equipment description are considered as proprietary information in operation of the equipment. The public disclosure of above documents might be harmful to our company and would give competitor an unfair advantage in the market. In case of short-term Confidentiality, the applicant requests the exhibits selected above are withheld from public view for a period of _180_____ days from the date of the Grant of Equipment Authorization and prior to marketing. It is our understanding that all measurement test reports, FCC ID label format and correspondent during certification review process cannot be granted as confidential documents and those information will be available for public review once the grant of equipment authorization is issued. Sincerely, Signature: Name: Ning Wei Title: Manager

C5266091_X13_Ed.1 1/1 Grandstream Networks, Inc. 126 Brookline Ave., 3rd Floor Boston, MA 02215, USA FCC Software Configuration Control Declaration Date: July 03, 2024 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Attn: OET Dept. Product/ Model Number: IP Phone / GRP2670 Regarding FCC Country Code Selection guidelines identified in KDB 594280. “All applications for equipment authorization for transmitters that can have radio parameters, or other technical parameters, reported to the Commission set by software must have an attestation indicating that no third party will have software, or configuration control, to program the device out of compliance of the technical rules under which it has been certified.” We declare that no third party will have software, or configuration control, to program the device out of compliance of the technical rules under which it has been certified. Signature of applicant Name: Ning Wei Title: Manager

宋娟娟 周鹏云 褚 滔 GRP2670FCC贴纸 设计人 制图人 审核人 比例 型号类型 料号 V3.0 1：1 版本 20240325日期 1/1页数 / 版本号变更记录日期 V1.0原始版本 V2.0更新为V2版本，取消UKCA图标20240117 20210824 V3.0添加Wi-Fi 6标识20240325 技术要求： 1.尺寸：53*28mm，四周倒角R=1mm，C=5mm，厚度0.1±0.05mm； 2.公差：±0.3mm； 3.材质：AW3209 80G铜版纸，印刷后过雾膜，背面带胶。要求高温70°C，高湿90%， 低温-25°C，时间各8小时环境下不脱落不翘起不起泡； 4.颜色：黑底白字； 5.量产前需样品承认，所有材料需符合环保规定。 R1 53.00 mm 28.00 mm 5 Label Location