Asia
SIP Trunk Thailand — +66 Termination & DID Numbers
Thailand receives a lot of inbound international calls through tourism and hospitality, centred on Bangkok and Phuket. Mobiles have ten digits starting 06, 08 or 09, and Bangkok landlines use area code 02.
Overview
Routing calls to Thailand
Calling windows matter: Thailand runs on Bangkok time, and we route +66 calls for Bangkok, Chiang Mai and Phuket, Pattaya and Khon Kaen across several carriers so a peak-hour congestion event on one network does not take your campaign down.
Inside the country, numbers are dialled with a 0 trunk prefix. Strip it before you send the call, and send 66 followed by the national number. On the rate sheet, Thailand is split into geographic, mobile and toll-free prefixes, following the plan set by NBTC, so your LCR can tell a cheap fixed-line call from a pricier mobile one.
Some Thailand number ranges can be activated with basic company details, while others need proof of address. Tell us the city and number type, and we will confirm what is needed before you order.
What you get
What you get in Thailand
One account and one balance, with the same SBCs for termination and inbound numbers.
CLI route tier
Caller ID delivered end to end on +66 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, 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 +66 prefix is mapped to more than one carrier. Failed attempts move to the next one automatically.
Number formats
How to dial Thailand from your PBX
Send E.164 digits. The sample number below shows the format only.
| Format | Example | Notes |
|---|---|---|
| International (E.164) | +66 2 123 4567 | How the number is written and stored. |
| Sent from your PBX | 6621234567 | E.164 digits with no plus, prefixed by your tech prefix if your account uses one. |
| With 00 exit code | 00 66 2 123 4567 | Accepted on the trunk. We normalise it to E.164. |
| National format | 02 123 4567 | Dialled inside Thailand. Strip the trunk prefix before sending. |
Compliance
Thailand rules to know
What applies before your first call or your first DID goes live.
Compliance box
- Regulator
- NBTC
- 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 Thailand routes
- 01
Hotels and travel agencies in Phuket and Bangkok taking international calls
- 02
Regional e-commerce support calling Thai mobiles
- 03
1800 toll-free lines for national services
Setup
Start calling Thailand 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 +66
Send 66 + national number in E.164 and check the CDR for your first test call.
Further reading: ASR and ACD Explained: How to Judge a VoIP Route
FAQ
Thailand SIP trunk questions
How do I dial Thai mobiles?
Drop the 0 and send 66 + 9 digits.
Who regulates Thai telecoms?
The NBTC (National Broadcasting and Telecommunications Commission).
What is the Bangkok area code?
02, so Bangkok numbers are +66 2 followed by 7 digits.
Can I get Bangkok DIDs?
Yes, subject to stock. Documents may be requested.
