I have a setup where a SIP proxy will route through a number of applications. An application may in turn proxy the call on, or it may become a UAS. I'd like to write test code for the original proxy that allows me to take a call from Alice to Bob and string it along several proxies to an eventual endpoint and I'd like to be able to monitor the progress of the SIP traffic at each point. Here's my question: I am mostly used to test software that pretends to be an endpoint - the UAC or UAS - but not a proxy. Does anyone have any pointers on ways of asserting that SIP traffic is flowing throuh a given proxy? I'd like to be able to test that, when Alice calls Bob, the proxy being tested correctly routes the call through proxyAppA, thence back to the proxy, then proxyAppB and finally to Bob (the UAS). Any thoughts? Thanks, Tom