tp-logger is a headless Observer client that logs information received by the Telepathy framework. It features pluggable backends to log different sorts of messages, in different formats. tp-logger features a Telepathy-style D-Bus API to expose logs and interesting information related to logging (most frequent contacts, etc.). It also provides a GLib-compatible client API for making bulk log requests (e.g. for display logs in applications without having to provide lots of information over D-Bus).
WWW: http://telepathy.freedesktop.org/wiki/Logger