[SIPForum-discussion] RTT estimation in SIP

[mustafa rifaee]

Hi all;
I would like to ask you if there is any important in SIP to find a mechanism
to estimate and calculate RTT (T1 timer).
for example in RFC 3261 we can estimate RTT using provisional response 100
Trying and TimeStamp for INVITE Transaction.
and if choice an error value for RTT  ( T1 Timer), is this will effect in
Call setup time Delay?

Please Help me;
Thanks
Mustafa
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