add key request and response opcodes (not implemented yet);

docs/TN.1000 - FNE Network.adoc

@@ -142,6 +142,14 @@ The function parameter of the extension header defines the major operation opcod
 |$7B
 |This function is a Master -> Peer request, for In-Call control operations (usually to terminate a call in progress).
 
+|Encryption Key Request
+|$7C
+|This function is a Peer -> Master request, for an encryption key.
+
+|Encryption Key Response
+|$7D
+|This function is a Master -> Peer response, for an encryption key.
+
 |Ack
 |$7E
 |This function is a general acknowledgment.

src/common/network/RTPFNEHeader.h

@@ -64,6 +64,8 @@ namespace network
 
             GRANT_REQ = 0x7AU,                      //! Grant Request
             INCALL_CTRL = 0x7BU,                    //! In-Call Control
+            KEY_REQ = 0x7CU,                        //! Encryption Key Request
+            KEY_RSP = 0x7DU,                        //! Encryption Key Response
 
             ACK = 0x7EU,                            //! Packet Acknowledge
             NAK = 0x7FU,                            //! Packet Negative Acknowledge