# 13258: Dial->Sim not supported in this realm

Log Type: APPLICATION

Log Level: ERROR

## Description

This error occurs when Twilio receives a `<Sim>` noun inside a `<Dial>` verb in a realm that does not support that behavior. Twilio's current `<Dial>` documentation lists the supported nouns for `<Dial>`, and Twilio's regional availability guidance explains that features unavailable in a target Region will not work in that Region.

### Possible causes

* Your TwiML response includes `<Sim>` nested inside `<Dial>`.
* The call is being executed in a Twilio realm or Region where `<Dial><Sim>` is not supported.
* The application was moved to, tested in, or routed through a different Region without verifying Voice feature availability for that Region.

### Possible solutions

* Update the call flow to use a currently documented `<Dial>` noun that matches your use case, such as `<Number>`, `<Client>`, `<Conference>`, `<Sip>`, `<Application>`, `<WhatsApp>`, or `<Queue>`.
* Verify which Twilio realm or Region is handling the call and confirm that the required Voice feature is supported there before returning the TwiML.
* If you need to keep using `<Dial><Sim>`, move that workflow to a realm that supports it; otherwise redesign the flow around supported Programmable Voice nouns in the target Region.

#### Additional resources

* [TwiML Voice: `<Dial>`](/docs/voice/twiml/dial)
* [Regional product availability](/docs/global-infrastructure/regional-product-and-feature-availability)
* [Understanding Twilio Regions](/docs/global-infrastructure/understanding-twilio-regions)