Subject: RE: [Sigtran] M3UA Version Control

From: Arun Panda <[email-masked]>
Date: Tue, 23 Apr 2002 10:52:24 +0530

Hi John,

please find the comments below..

I guess this will help you to clarify your doubts.
Please let me know if i'm wrong.

Rgds
Arun

-----Original Message-----
From: John McLaine [mailto:[email-masked]]
Sent: Tuesday, April 23, 2002 10:21 AM
To: [email-masked]
Subject: [Sigtran] M3UA Version Control

hi
from M3UA Version Control (Section 4.3.4.1.1) I
understand that, especially in ASP-SGP case, only SGP
will check the version field of only ASP UP message.
If it is found to be unsupported then it will behave
as specified in the draft... In other words Version
field of Common Header will never be checked, except
from ASP UP message.
Please tell me if i am mis-interpreting it.
And what ASP should do if it receives ERROR(INVALID
VERSION) when it hasn't sent ASP UP (or after receipt
of ASP UP ACK).

Arun>>>>>>
The Message Error(Invalid Verion) is sent by the SGP whenever it 
recieves a Message with an upsupported version. In the Error Message 
Common Header contains the Supported Version.
Do u mean by this statement 
" what ASP should do if it receives ERROR(INVALID
VERSION) when it hasn't sent ASP UP"
It's not the case that the Error Message(Invalid Verion) is sent only in
response to a 
ASP Up (with a unsupported version) Message. It can be sent in response to
any Message.
 like ASP Down etc..
As the Draft specifies, now only Version 1.0 is supported. But this is
useful when the network is  upgraded to a new protocol version. In which
case the nodes will support the new as well as the old versions.

regards,
John.

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