SEJONG Networksview more
30+ years of connecting global partners
to Korea with carrier-grade connectivity
Nationwide Coverageview more
Seamless Connectivity Across the Nation
Powered by 17,200 km of fiber
Leased Lineview more
Reasonable prices, stable, and high-quality network services

Cutstomized services for business success

A corporate network for fast and reliable data transmission
Data Networkview more
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Rapid corporate telephony over a stable network for customer connection
Voice Serviceview more
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Find the services
required for our company

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I wish to make high-quality calls with international customers
OOGlobal
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I want to send a variety of messages to customers all at once
OOCommerce
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I want to smoothly handle large traffic volumes at a low cost
OOMedia
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We need an independent and stable network between major hubs
OO Securities

Providing various information about SEJONG Networks