[Sigtran] Client/Server Operation in M3UA IPSP

Hi All,

After the recent plugtest, it was suggested that this issue should be 
brought up here just for confirmation. So here goes.

In IPSP mode of M3UA, should there be any difference between how the 
client side and the server side operate?
For example, is it valid for the server side to send ASPUP?
Also, should the client send NTFY messages?

The way we interpret the RFC is that there is zero difference between 
client and server at M3UA level. The only difference is that the client 
side brings up the SCTP association.

Looking back through previous drafts of M3UA, section 1.4.8 of 
draft-ietf-sigtran-m3ua-06.txt did say "In the case of IPSP to IPSP 
communication, the peer endpoints using M3UA SHOULD be configured so 
that one always takes on the role of client and the other the role of 
server for initiating SCTP associations and M3UA messaging."
However the M3UA part was removed for draft 07 onwards.

In fact, I don't think Double Exchange would work if you dissallow the 
sending of ASPUP from the server side.

Comments?

Peter

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