I am trying to do two types of measurements on a packet (say an INVITE or BYE) that arrives at a kamailio proxy.

1) The time that packet is spending in Kamailio to be processed

2) The total time from when the packet arrives at the machine that runs the proxy till it leaves that machine.

I believe kamailio shall be able to help me with (1) and for (2) , I may need to use some linux tools 

Have anybody tried to measure response time with either definition? and in case that you have, how have you done it?

Thanks

Alireza