Hi, I don't understand how "Timestamp" header must be parsed. SIP ABNF says:
-----------------
Timestamp = "Timestamp" HCOLON 1*(DIGIT) [ "." *(DIGIT) ] [ LWS delay ]
; example:
; Timestamp: 54
delay = *(DIGIT) [ "." *(DIGIT) ]
-----------------
It allows values like:
- Timestamp: 1.123
- Timestamp: 0.4 12.55 => delay = 12.55 seconds
RFC 3261 says:
---------------
20.38 Timestamp
The Timestamp header field describes when the UAC sent the request to
the UAS.
---------------
And:
--------------
8.2.6.1 Sending a Provisional Response
When a 100 (Trying) response is generated, any Timestamp header field
present in the request MUST be copied into this 100 (Trying)
response. If there is a delay in generating the response, the UAS
SHOULD add a delay value into the Timestamp value in the response.
This value MUST contain the difference between the time of sending of
the response and receipt of the request, measured in seconds.
-------------
I understand the "delay" value. For example:
- Timestamp: 0.4 12.55
It means that it took to the server 12.55 seconds to generate the 100.
My question is:
- What does the first value mean?
1*(DIGIT) [ "." *(DIGIT) ]
In the example above it's 0.4. What is it?
Thanks for any explanation.
--
Iñaki Baz Castillo
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