[megaco] Update the app file and some docs

OTP-15882

4 files changed, 18 insertions, 6 deletions

diff --git a/lib/megaco/doc/src/megaco_edist_compress.xml b/lib/megaco/doc/src/megaco_edist_compress.xml
index 16443e469c..8461c59a00 100644
--- a/lib/megaco/doc/src/megaco_edist_compress.xml
+++ b/lib/megaco/doc/src/megaco_edist_compress.xml
@@ -43,8 +43,8 @@
       <name since="">Module:encode(R, Version) -> T</name>
       <fsummary>Encode (compress) a megaco component.</fsummary>
       <type>
-        <v>R = megaco_message() | transaction() | action_reply() | action_request() | command_request()</v>
-        <v>Version = integer()</v>
+	<v>R = megaco_encoder:megaco_message() | megaco_encoder:transaction() | megaco_encoder:action_reply() | megaco_encoder:action_request() | megaco_encoder:command_request()</v>
+        <v>Version = megaco_encoder:protocol_version()</v>
         <v>T = term()</v>
       </type>
       <desc>
@@ -57,8 +57,8 @@
       <fsummary>Decode (decompress) a megaco component.</fsummary>
       <type>
         <v>T = term()</v>
-        <v>Version = integer()</v>
-        <v>R = megaco_message() | transaction() | action_reply() | action_request() | command_request()</v>
+        <v>Version = megaco_encoder:protocol_version()</v>
+        <v>R = megaco_encoder:megaco_message() | megaco_encoder:transaction() | megaco_encoder:action_reply() | megaco_encoder:action_request() | megaco_encoder:command_request()</v>
       </type>
       <desc>
         <p>Decompress a megaco component. </p>
diff --git a/lib/megaco/doc/src/megaco_encoder.xml b/lib/megaco/doc/src/megaco_encoder.xml
index cc8270440b..af1baa6661 100644
--- a/lib/megaco/doc/src/megaco_encoder.xml
+++ b/lib/megaco/doc/src/megaco_encoder.xml
@@ -42,7 +42,16 @@
 
   <section>
     <title>DATA TYPES</title>
+    <description>
+      <p>Note that the actual definition of (some of) these records depend on
+      the megaco protocol version used. For instance, the
+      <c>'TransactionReply'</c> record
+      has two more fields in version 3, so a simple erlang type definition
+      cannot be made here. </p>
+    </description>
     <code type="none"><![CDATA[
+protocol_version() = integer()
+segment_no()       = integer()
 megaco_message() = #'MegacoMessage{}'
 transaction() = {transactionRequest,     transaction_request()}      |
                 {transactionPending,     transaction_reply()}        |
@@ -57,6 +66,8 @@ transaction_ack() = #'TransactionAck'{}
 segment_reply() = #'SegmentReply'{}
 action_request() = #'ActionRequest'{}
 action_reply() = #'ActionReply'{}
+command_request() = #'CommandRequest'{}
+error_desc()   = #'ErrorDescriptor'{}
     ]]></code>
 
     <marker id="encode_message"></marker>
diff --git a/lib/megaco/src/app/megaco.app.src b/lib/megaco/src/app/megaco.app.src
index c54c80351c..5fb7273b4a 100644
--- a/lib/megaco/src/app/megaco.app.src
+++ b/lib/megaco/src/app/megaco.app.src
@@ -107,6 +107,7 @@
 	megaco_udp,
 	megaco_udp_server,
 	megaco_udp_sup,
+	megaco_user,
 	megaco_user_default
        ]},
   {registered, [megaco_config, megaco_monitor, 
diff --git a/lib/megaco/src/engine/megaco_edist_compress.erl b/lib/megaco/src/engine/megaco_edist_compress.erl
index 0451a48358..968ab6f16e 100644
--- a/lib/megaco/src/engine/megaco_edist_compress.erl
+++ b/lib/megaco/src/engine/megaco_edist_compress.erl
@@ -31,12 +31,12 @@
                  megaco_encoder:action_reply() | 
                  megaco_encoder:action_request() | 
                  megaco_encoder:command_request(),
-      Version :: integer(),
+      Version :: megaco_encoder:protocol_version(),
       T       :: term().
 
 -callback decode(T, Version) -> R when
       T       :: term(),
-      Version :: integer() | dynamic,
+      Version :: megaco_encoder:protocol_version() | dynamic,
       R       :: megaco_encoder:megaco_message() |
                  megaco_encoder:transaction() | 
                  megaco_encoder:action_reply() |