Currently, each component stores logs in some different locations.
Calamar SipProxy - Can store logs where ever you have configured (or no logs at all). The SipProxy currently is able to log both General Messages and all Sip Traffic to two log files. These logs can also be redirected to any program or pipe.
MediaProxy - The Media Proxy generally only logs Errors, SipProxy Connections, Startup and Shutdown.
TerraPBX MediaGateway - Logs are split to two logs, Sip Traffic and general logging status.