[Sip] Proposed closure of open issue #71: RTT estimation w/ Timestamp

Hi,

I am proposing closure of open issue #71 on RTT estimation using the 
Timestamp header.
The open issue is that the spec doesn't describe how to estimate RTT in the 
face of retransmits.

I propose changing the following text to make this a local implementation 
issue:

From:
"The timestamp is used by the client to compute the RTT to the server so it 
can adjust the timeout value for retransmission"

To:
"The timestamp MAY be used ...

this clarifies that this is purely optional behavior and local 
implementation heuristics.

comments or objections?

thanks,
-rohan

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