YZZGSC3565Smart Outdoor Intercom

U.S. AGENT LETTER OF ATTESTATION Date: 2026-03-23 FEDERAL COMMUNICATIONS COMMISSION Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Ref: Attestation Statements CFR 47 §2.911(d)(7) Filing FCC ID: YZZGSC3565 Grandstream Networks, Inc. certifies that, as of the date of the filing of the application, Grandstream Networks, Inc. is our designated U.S. 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 the equipment. Grandstream Networks, Inc. accepts, as of the date of the filing of the application, the obligation of the designated U.S. agent for service of process for the above referenced FCC ID. Designated U.S. Agent and Applicant Information: Name: Grandstream Networks, Inc. Address: 126 Brookline Ave., 3rd Floor Boston, MA 02215, USA FRN: 0020352431 Tel.: +1 617-566-9300 Email: [email protected] Signed by (printed name): Junwei Wang Signature:

Grandstream Networks, Inc. www.grandstream.com 126 Brookline Avenue -3 rd Floor Tel: +1-617-566-9300 Boston, MA 02215 USA Boston, MAI Los Angeles, CAI Dallas, TXICasablanca, MoroccoIValencia, VenezuelaIHangzhou, China IShenzhen, ChinaI Selangor, Malaysia I Madrid, Spain Confirmation Letter We hereby confirm that any of our production units bearing the following model numbers are identical in electrical, mechanical and physical design. The main board of GSC3560,GSC3565 shares the same PCB layout, except that the main control chip GSC3565 is RV1106G3, and the main control chip of GSC3560 is RV1106G2. In addition, GSC3565 contains a camera sensor module,but GSC3560 doesn’t have it. Confirmed by: Company： Grandstream Networks, Inc 126 Brookline Ave., 3rd Floor Boston, MA 02215,USA Name/Title：Junwei Wang/VP of HW Engineering Signature： Date of issue：January 15,2026 FED ERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Product Name: Smart Outdoor Intercom Model: GSC3565, GSC3560 FCC ID: YZZGSC3565

Grandstream Networks, Inc. Address: 126 Brookline Ave., 3rd Floor Boston, MA 02215, USA Email: [email protected] TEL: +1 617-566-9300 CFR 47 §2.911(d)(5)(i) Attestation Letter Attestation Letter Date: 2026-03-23 FEDERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Ref: Attestation Statements CFR 47 §2.911(d)(5)(i) Filing FCC ID: YZZGSC3565 Grandstream Networks, Inc. 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. Sincerely, Signature Contact Person: Junwei Wang Title: VP of HW Engineering

Grandstream Networks, Inc. Address: 126 Brookline Ave., 3rd Floor Boston, MA 02215, USA Email: [email protected] TEL: +1 617-566-9300 CFR 47 §2.911 (d)(5)(ii) Attestation Letter Attestation Letter Date: 2026-03-23 FEDERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Ref: Attestation Statements CFR 47 §2.911(d)(5)(ii) Filing FCC ID: YZZGSC3565 Grandstream Networks, Inc. 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. We also certify that, as of the date of the filing of the application, the equipment does not utilize cyber-security or anti-virus software from Kaspersky Lab, Inc, or any of its successors and assignees, which is also on the “covered list”. Sincerely, Signature Contact Person: Junwei Wang Title: VP of HW Engineering

Grandstream Networks, Inc. Address: 126 Brookline Ave., 3rd Floor Boston, MA 02215, USA Email: [email protected] TEL: +1 617-566-9300 QA-FR-170-B 7/29/2014 FCC Authorization Date: 2026-03-23 FEDERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Subject: Agent Authorization To whom it may concern: We Grandstream Networks, Inc., the undersigned, hereby authorizes Shenzhen Accurate Technology Co., Ltd. to act on its behalf in all matters relating to application for Equipment authorization, including the signing of all documents relating to these matters. All acts carried out by Shenzhen Accurate Technology Co., Ltd. on our behalf shall have the same effect as our own action. We, the undersigned, hereby certify that we are not subject to a denial of federal benefits, that includes FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C. 862. This authorization is valid until further written notice from the applicant. Sincerely Yours, Signature: Junwei Wang VP of HW Engineering

Grandstream Networks, Inc. Address: 126 Brookline Ave., 3rd Floor Boston, MA 02215, USA Email: [email protected] TEL: +1 617-566-9300 FCC Confidential Authorization Date: 2026-03-23 FEDERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Subject: Confidentiality Request regarding application for certification of FCC ID: YZZGSC3565 In accordance with Sections 0.457 and 0.459 of the Commission’s Rules, Grandstream Networks, Inc. hereby requests long-term confidential treatment of information accompanying this application as outlined below: • Block Diagram • Schematics • Operation Description As well as short-term confidential treatment of information accompanying this application for a period of 180 days after grant is issued as outlined below: • Internal Photos • User’s Manual • External Photos • Test Set-up Photos The above materials contain proprietary and confidential information not customarily released to the public. The public disclosure of these materials provides unjustified benefits to its competitors in the market. Sincerely Yours, Signature: Junwei Wang VP of HW Engineering

Model: GSC3560 R1 53.00 mm 28.00 mm 5 Label Label location

Model: GSC3560 R1 53.00 mm 28.00 mm 5 Label Label location

Note: This report must not be used by the customer to claim product certification, approval, or endorsement by A2LA, or any agency of the Federal Government. The information marked “#” is provided by the applicant, the laboratory is not responsible for its authenticity and this information can affect the validity of the result in the test report. Customer model name, addresses, names, trademarks etc. are included but no need marked. This report cannot be reproduced except in full, without prior written approval of the Company. Unless otherwise stated the results shown in this test report refer only to the sample(s) tested. This report is valid only with a valid digital signature. The digital signature may be available only under the Adobe software above version 7.0. Shenzhen Accurate Technology Co., Ltd. Floor 1, KuMaKe Building, Dongzhou Community, Guangming Street, Guangming District, Shenzhen, Guangdong, China. Tel: +86 755-26503290 Web: www.atc-lab.com Rev:A/4.0(2024/11/01) Page 1 of 43 TR-4-E-R000 TEST REPORT Applicant Name: Grandstream Networks, Inc. Address: 126 Brookline Ave., 3rd Floor Boston, MA 02215, USA Report Number: 2504A24498E-EM-00A FCC ID: YZZGSC3565 Test Standard (s) FCC Rules and Regulations Part 15 Subpart B Class B Sample Description Product Name: Smart Outdoor Intercom Model No.: GSC3565, GSC3560 Trade Mark: GRANDSTREAM Date Received: 2025-12-30 Report Date: 2026-03-16 Test Result: The EUT complied with the standards above. Prepared and Checked By: Approved By: Ronour Huang Bob.Liao EMC Engineer EMC Engineer Shenzhen Accurate Technology Co., Ltd. Report No.: 2504A24498E-EM-00A Rev:A/4.0(2024/11/01) Page 2 of 43 TR-4-E-R000 TABLE OF CONTENTS DOCUMENT REVISION HISTORY ................................................................................................................ 3 GENERAL INFORMATION ............................................................................................................................ 4 PRODUCT DESCRIPTION FOR EQUIPMENT UNDER TEST (EUT) ........................................................................ 4 OBJECTIVE ................................................................................................................................................... 4 TEST METHODOLOGY .................................................................................................................................... 4 TEST FACILITY .............................................................................................................................................. 4 MEASUREMENT UNCERTAINTY ....................................................................................................................... 5 SYSTEM TEST CONFIGURATION ............................................................................................................... 6 DESCRIPTION OF TEST CONFIGURATION ......................................................................................................... 6 EUT EXERCISE SOFTWARE ........................................................................................................................... 6 SPECIAL ACCESSORIES ................................................................................................................................. 6 EQUIPMENT MODIFICATIONS .......................................................................................................................... 6 SUPPORT EQUIPMENT LIST AND DETAILS ....................................................................................................... 6 EXTERNAL I/O CABLE .................................................................................................................................... 6 BLOCK DIAGRAM OF TEST SETUP .................................................................................................................. 7 SUMMARY OF TEST RESULTS ................................................................................................................... 9 TEST EQUIPMENT LIST ............................................................................................................................. 10 CONDUCTED EMISSIONS .......................................................................................................................... 11 APPLICABLE STANDARD ............................................................................................................................... 11 EUT SETUP ................................................................................................................................................ 11 EMI TEST RECEIVER SETUP ........................................................................................................................ 11 TEST PROCEDURE ...................................................................................................................................... 12 CALCULATION ............................................................................................................................................. 12 TEST DATA ................................................................................................................................................. 12 RADIATED EMISSIONS .............................................................................................................................. 22 APPLICABLE STANDARD ............................................................................................................................... 22 EUT SETUP ................................................................................................................................................ 22 EMI TEST RECEIVER & SPECTRUM ANALYZER SETUP .................................................................................. 23 TEST PROCEDURE ...................................................................................................................................... 23 CA…

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