||== RUE Interface (this document)
                           ||
                           \/
  +------+   +------+      -       +--------+     -      +-------+
  |User  |   |RUE   |    (   )     |Provider|    (  )    |User   |
  |who is|   |Device|<-(Internet)->|        |            |who is |
  |Deaf  |<->|      |              |        |<-( PSTN )->|Hearing|
  +------+   +------+   --------   +--------+   ------   +-------+
                                        ^
                                        |
                                +--------------+
                                |Communications|
                                |Assistant     |
                                +--------------+