This code system http://terminology.hl7.org/CodeSystem/subscription-channel-type defines the following codes:
\n \n \n \n \n \n Code\n \n | \n \n \n \n Display\n \n | \n \n \n \n Definition\n \n | \n \n
\n \n \n \n rest-hook\n \n \n \n | \n \n Rest Hook | \n \n The channel is executed by making a post to the URI. If a payload is included, the URL is interpreted as the service base, and an update (PUT) is made. | \n \n
\n \n \n \n websocket\n \n \n \n | \n \n Websocket | \n \n The channel is executed by sending a packet across a web socket connection maintained by the client. The URL identifies the websocket, and the client binds to this URL. | \n \n
\n \n \n \n email\n \n \n \n | \n \n Email | \n \n The channel is executed by sending an email to the email addressed in the URI (which must be a mailto:). | \n \n
\n \n \n \n sms\n \n \n \n | \n \n SMS | \n \n The channel is executed by sending an SMS message to the phone number identified in the URL (tel:). | \n \n
\n \n \n \n message\n \n \n \n | \n \n Message | \n \n The channel is executed by sending a message (e.g. a Bundle with a MessageHeader resource etc.) to the application identified in the URI. | \n \n
\n \n