Given the asynchronous nature of SIP, debugging issues in a SIP application server could turn out to be a nightmare. Tools like Wireshark are widely used for tracing SIP messages in the network.

SailFin v2 implements a new feature that allows users to inspect SIP message flow in the container more effectively. Take a look at Peter's one pager and Sankar's blog on SIP Message Inspection for more details.

This new feature compliments SIP access logging, which is similar to more familiar HTTP access logging.