Subject: [Sigtran] M2PA Draft 7 comment

From: "John Li" <[email-masked]>
Date: Wed, 29 Jan 2003 23:06:58 -0500

I have the following comments on the draft. Thanks,
John

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1.	In section 1.5: the following statement is somewhat confusing.
“The SG is an IPSP equipped with both traditional SS7 and IP
network connections. In effect, the Signaling Gateway acts as a
Signal Transfer Point (STP)” 

Perhaps we can say "The SG interconnects SS7 and IP networks by converting signaling traffic" or just refer to the definition in section 1.2

2.	Section 2.1.5 Message length
Should we specify the valid value range of the length?

3.	Section 2.3.1 User Data

statement "M2PA does not add padding to the MTP3 message.". I think we should make it a requirement: “M2PA should not add padding to the MTP3 message.”

4.	In section 4.1.3 Link alignment

perhaps we can specify the recommended practice for choosing emergency proving vs. normal proving during alignment procedure.

5.	Section 4.1.8: 
"If a Link Status Alignment message with an unsupported
received by the newer version, the receiving end's M2PA
SHALL NOT complete the alignment procedure."

can we clearly define the behavior of not completing the alignment procedure?

6.	section 4.2.1 sending and receiving messages
When M2PA receives a User Data message with Backward Sequence Number
equal to 'n', it may remove all messages with Forward Sequence Number
<= n from its queue.

This is incorrect. Consider at the time SN is cycled to 0 from 127 (assume 128 buffers), there are 127, 126, etc are waiting for acknowledgement. We should replace it with “The message n and all outstanding (not yet acknowledged) messages sent before the message n may be removed from its queue.

7.	section 4.2.1
If M2PA receives an empty User Data message, it SHALL NOT send an
acknowledgement of that message.

What is empty User Data message? FISUs? 

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