Vietnam voice guidelines
Voice calling guidelines for Vietnam (VN), covering reachability, caller ID formats, DTMF support, and emergency services.
Locale overview
| Field | Value |
|---|---|
| Country | Vietnam |
| ISO code | VN |
| Region | Asia-Pacific |
| Dialing code | +84 |
Reachability
Outbound calls to Vietnam must originate from an international number.
| Call type | Inbound | Outbound |
|---|---|---|
| Domestic | Not supported | Not supported |
| International | Supported | Supported (best effort, not guaranteed) |
| Toll-free | Supported | Not supported |
Caller ID
| Call type | Direction | Format |
|---|---|---|
| International | Inbound | +E.164 |
| International | Outbound | +E.164 (not guaranteed) |
| Toll-free | Inbound | +E.164 |
| Toll-free | Outbound | Not applicable |
DTMF support
RFC 2833 DTMF is supported for outbound calls, though delivery is not guaranteed due to carrier routing variability in Vietnam.
Emergency services
Calling emergency services in Vietnam is not supported. Do not rely on this integration for emergency calling.
Compliance note
These guidelines summarize carrier requirements at the time of publication and do not constitute legal counsel. Verify that your implementation complies with all applicable telecommunications regulations in Vietnam.