1. AMHS Workshop Chennai, India December 15-16, 2008
AMHS Protocols
Tom McParland
BCI

2. AMHS Protocols X.400 Model X.400 Protocols X.400 Protocol List
X.400 Messaging Network with Supporting Network Infrastructure
X.400 and Network Infrastructure Protocols
X.400 Protocol Stacks
X.400 over OSI
X.400 over IPS
AFTN Network
AFTN Protocols
X.400/AFTN Network
AFTN Switch with AFTN/AMHS Gateway

3. X.400 Message Handling System

4. X.400 Protocols
P1 Protocol
The P1 protocol handles the layout of a message sent from one Message Transfer Agent (MTA) to another Message Transfer Agent.
Using the “letter and envelope” analogy, P1 is the ‘envelope’ while P2 is the ‘letter’ or the message to be sent.
P2 Protocol
The P2 protocol is the way in which the originator and the recipient know the format of the message is being transmitted.

5. X.400 Protocols
P3 Protocol
The P3 protocol is how the Message Transfer Agent (MTA) communicates with the User Agent (UA). A UA prepares a message and using P3 submits it to the MTA. P3 is used to deliver a message directly to the UA from the MTA.
It is not necessary to implement P3 from a point of view of interoperability between X.400 Message Servers. This function could be implemented for example as a Web Browser.
P7 Protocol
Because the User Agent is not always available there is a Message Store (MS). The P7 Protocol is for communication between the UA and the MS. . P7 provides facilities to select messages selectively from the MS.
It is likewise not necessary to implement P7 for interoperability. This function for example could be implemented using data base access techniques.

6. X.400 Protocol Specifications
Name
Specification
Abstract Service
PICS/ISP P2
Interpersonal
Messaging
X.420
(ISO/IEC )
AMH21
X.481
(ISO/IEC ) P1
MTS Transfer Protocol
X.419
(ISO/IEC )
X.411
(ISO/IEC )
AMH11
X.482
(ISO/IEC ) P3
MTS Access Protocol
AMH12, AMH14
X.483
(ISO/IEC ) P7
MS Access Protocol
X.413
(ISO/IEC )
AMH13,AMH15
X.484
(ISO/IEC ,
ISO/IEC )

7. X.400 Messaging Network with Supporting Network Infrastructure

8. X.400 and Network Infrastructure Protocols

9. X.400 Protocol Stack – OSI

10. OSI – Upper Layer Structure

11. X.400 Protocol Stack – IPS

12. AFTN Network

13. AFTN Protocols

14. X.400/AFTN Network

15. AFTN Switch with AFTN/AMHS Gateway