Asia
SIP Trunk South Korea — +82 Termination & DID Numbers
Korean handsets show a clear 'international call' notice on calls from abroad, so customers are cautious about answering unfamiliar foreign numbers. Mobiles are almost all 010, and 070 numbers are the standard range for internet telephony.
Overview
Routing calls to South Korea
Whether you are calling a desk phone in Seoul or a mobile in Incheon, Daegu and Daejeon, the call is routed by the longest matching +82 prefix and sent to the best-performing carrier for that range. When a carrier fails, the next one takes over, and the CDR shows exactly which leg carried the call.
The national telecom regulator sets the South Korea numbering plan, and our prefix tables follow it closely. Supported number types: geographic, national, mobile and toll-free. Inside the country, numbers are dialled with a 0 trunk prefix. Strip it before you send the call, and send 82 followed by the national number.
Documentation for South Korea DIDs depends on the range. Some go live with standard account details, and others need a local address. Outbound calling has no extra requirements.
What you get
What you get in South Korea
One account and one balance, with the same SBCs for termination and inbound numbers.
CLI route tier
Caller ID delivered end to end on +82 calls. Use it for sales, support and any traffic where answer rates matter.Non-CLI route tier
A lower-cost tier where caller ID delivery is not guaranteed. Suitable for internal or transactional traffic that does not depend on the CLI.Number types
Geographic, National, Mobile, Toll-free. DID availability varies by range and city.Codecs
G.711a/u and G.729 on every route, G.722 and Opus where the far end supports them. T.38 for fax.Channels on demand
Concurrent call limits are set per account and raised as your traffic grows. No fixed channel bundles.Multi-carrier failover
Every +82 prefix is mapped to more than one carrier. Failed attempts move to the next one automatically.
Number formats
How to dial South Korea from your PBX
Send E.164 digits. The sample number below shows the format only.
| Format | Example | Notes |
|---|---|---|
| International (E.164) | +82 2 1234 5678 | How the number is written and stored. |
| Sent from your PBX | 82212345678 | E.164 digits with no plus, prefixed by your tech prefix if your account uses one. |
| With 00 exit code | 00 82 2 1234 5678 | Accepted on the trunk. We normalise it to E.164. |
| National format | 02 1234 5678 | Dialled inside South Korea. Strip the trunk prefix before sending. |
Compliance
South Korea rules to know
What applies before your first call or your first DID goes live.
Compliance box
- Regulator
- The national telecom regulator
- Caller ID
- A valid CLI that you are entitled to use is required on CLI routes. Spoofed or unallocated numbers are blocked.
- DID KYC
- Sometimes required
Rules change — our team confirms current requirements before activation.
Use cases
Who uses South Korea routes
- 01
Gaming and e-commerce support calling Seoul customers
- 02
Electronics and automotive suppliers linking offices in Busan and Incheon
- 03
070 VoIP numbers for foreign companies opening a local presence
Setup
Start calling South Korea in 3 steps
- 01
Top up $200
Open a prepaid account and add balance by USDT (TRC20), BTC or card. - 02
Add your trunk
Whitelist your PBX IP or create digest credentials, then point your outbound route at our SBC. - 03
Dial +82
Send 82 + national number in E.164 and check the CDR for your first test call.
Further reading: CLI vs Non-CLI Routes: What Actually Changes for Your Calls
FAQ
South Korea SIP trunk questions
What are 070 numbers?
The range reserved for internet telephony (VoIP) services.
How do I dial Korean mobiles?
Drop the 0 and send 82 10 followed by 8 digits.
Who regulates Korean telecoms?
The national telecom regulator. We confirm current requirements before activation.
What is the Seoul area code?
02, so Seoul numbers are +82 2 followed by 7 or 8 digits.
