SIP how to measure call per time unit

Question

I need to send a big number of SIP requests to our server for testing purposes. One solution I've found is SIPp. Now I want to measure the number of SIP requests that can be sent by my client per unit of time. SIPp gives the possibility to set the call-rate but I know that there are also physical limitations(client CPU, network card, ...). That's what I want to test first. I think that this question can be extended to : how to measure the number of packets sent by one client per unit of time. I thought about using Wireshark by counting the number of sent SIP INVITE packets during one second (using the time column) but I don't know what the precision of this method.

Answer 1

Wireshark (or tshark/tcpdump/etc) should work; they record the packets actually sent on the wire and when they were sent.