Interact with the server interface using FHIR's RESTful interface. For details on its version/capabilities you should connect the value in Endpoint.address and retrieve the FHIR CapabilityStatement.
hl7-fhir-msg
HL7 FHIR Messaging
Use the servers FHIR Messaging interface. Details can be found on the messaging.html page in the FHIR Specification. The FHIR server's base address is specified in the Endpoint.address property.
hl7v2-mllp
HL7 v2 MLLP
HL7v2 messages over an LLP TCP connection
secure-email
Secure email
Email delivery using a digital certificate to encrypt the content using the public key, receiver must have the private key to decrypt the content
direct-project
Direct Project
Direct Project information - http://wiki.directproject.org/