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REVENUE RECOGNITION - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
REVENUE RECOGNITION |  |  |  |
Total revenue | $ 220,583 | $ 192,620 | $ 401,862 | $ 372,284
United States |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 116,222 | 81,469 | 198,917 | 152,583
Europe, Middle East and Africa |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 52,113 | 58,918 | 97,612 | 126,001
Asia Pacific |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 41,752 | 38,437 | 84,931 | 68,238
Other |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 10,496 | 13,796 | 20,402 | 25,462
Product revenue |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 115,057 | 99,133 | 197,048 | 186,743
Product revenue | Cloud and Edge |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 56,112 | 39,586 | 87,973 | 71,099
Product revenue | IP Optical Networks |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 58,945 | 59,547 | 109,075 | 115,644
Product revenue | Sales to enterprise customers |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 39,052 | 38,040 | 62,284 | 75,910
Product revenue | Sales to service provider customers |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 76,005 | 61,093 | 134,764 | 110,833
Product revenue | Indirect sales through channel partner program |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 38,988 | 31,282 | 61,723 | 76,957
Product revenue | Direct sales |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 76,069 | 67,851 | 135,325 | 109,786
Product revenue | United States |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 59,101 | 35,368 | 88,442 | 61,975
Product revenue | Europe, Middle East and Africa |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 25,534 | 33,239 | 44,994 | 74,928
Product revenue | Asia Pacific |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 27,966 | 26,081 | 59,005 | 42,714
Product revenue | Other |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 2,456 | 4,445 | 4,607 | 7,126
Service |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 105,526 | 93,487 | 204,814 | 185,541
Service revenue (maintenance) |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 68,297 | 67,520 | 134,719 | 135,901
Service revenue (maintenance) | Cloud and Edge |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 51,816 | 52,663 | 102,584 | 105,859
Service revenue (maintenance) | IP Optical Networks |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 16,481 | 14,857 | 32,135 | 30,042
Service revenue (maintenance) | United States |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 33,546 | 32,639 | 66,870 | 65,486
Service revenue (maintenance) | Europe, Middle East and Africa |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 18,362 | 17,491 | 35,745 | 35,187
Service revenue (maintenance) | Asia Pacific |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 9,708 | 9,759 | 19,108 | 20,000
Service revenue (maintenance) | Other |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 6,681 | 7,631 | 12,996 | 15,228
Service revenue (professional services) |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 37,229 | 25,967 | 70,095 | 49,640
Service revenue (professional services) | Cloud and Edge |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 29,120 | 18,306 | 54,082 | 35,266
Service revenue (professional services) | IP Optical Networks |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 8,109 | 7,661 | 16,013 | 14,374
Service revenue (professional services) | United States |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 23,575 | 13,462 | 43,605 | 25,122
Service revenue (professional services) | Europe, Middle East and Africa |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 8,217 | 8,188 | 16,873 | 15,886
Service revenue (professional services) | Asia Pacific |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 4,078 | 2,597 | 6,818 | 5,524
Service revenue (professional services) | Other |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | $ 1,359 | $ 1,720 | $ 2,799 | $ 3,108

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