Hello all;
I need some Clarification about timestamp header in RFC 3261; i need to use
it to estimate the RTT value;
how it is work in this scenario?:
Invite
UA --------------------> Proxy1
| | Invite
| | ------------------------------
--------->Proxy2
| 100 trying
| |
| <---------------------------|
| invite
|
| |
| |
|
--------------------------------------->UA2
| | <-------100 trying-------------------
| |
|
| | <--------180
Ringing-------------- |
| | <---------------180 Ringing-------
| |
|
| |
|
|<---180 Ringing----------|
| |
UA send invite to proxy1 with timestamp=10 ; then the Proxy1 send the invite
message to proxy2 and reply with provisional response (100 trying) and with
timestamp=10 0.5;
When UA receive 100trying; UA will adapt its retransmition timer T1 to the
calculated value from timestamp;
then UA adapt T2 Timer value; is This true?
Here Can Proxy1 send invite message with timestamp header?;
for example timestamp=8 and when proxy2 recive invite request, it send it
to UA and he send 100 trying to proxy1 with
timestamp=8 0.4;
Please Help me;
Thanks;
Mustafa AL Rifaee
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