Without the right tools, VoIP problems — one-way audio, dropped calls, choppy voice — are nearly impossible to diagnose after the fact. Homer SIPCapture changes that: a searchable database of every SIP transaction, visual call flow diagrams, and RTP quality statistics in one place. This guide covers setup, HEP configuration on FreeSWITCH and Asterisk, and how to use Homer to track down the most common call quality failures.