Extension: "IsTTY"
URL: "http://help.caredove.com/developer-integrations/fhir-extension-istty"
Value: valueBoolean

Description:

This extension is used with Telecom, to define whether or not the phone system is Text Telephone enabled.

Resource & Resource Element Locations:

This extension is located under HealthcareService.telecom 

Example:

"resource": {
    "resourceType": "HealthcareService",
    "id": "16907",
        {
            "extension": [
                {
                    "url": "http://help.caredove.com/developer-integrations/fhir-extension-istty",
                    "valueBoolean": true
                }
            ],
        }
    }
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