brianchandotcom/liferay-plugins — pull request #2461 by eepp (2013-12-17 04:23:29+00:00)
Title: LPS-40873 Add initiated timestamp to WebRTCConnection

I think `initiatedTimestampMs` explains the purpose of this attribute.
According to Wikipedia, a timestamp is:

a sequence of characters or encoded information identifying when a
certain event occurred, usually giving date and time of day,
sometimes accurate to a small fraction of a second.

The `Ms` suffix is added to specify that it's a timestamp in
milliseconds since Unix timestamps are most commonly in seconds.