This number is part of the WebEx video conferencing system.  WebEx users can often times have WebEx call them (instead of having you dial into the conference call).  If you receive a call from this number and did not request that a WebEx conference call you then most likely a WebEx user typedin the wrong number for them to be called at (or the number was spoofed).  Either way, it is not a call I would be concerned about missing.