Though I never got a reply in this forum but still looking for with new topicsā¦I have created Meet me in Conference extension (1800) and it is working fine. How I check the call logging for this Particular extension like how many callers are using this extension, how long, from where (caller ID) etc. etc.
This Conference extension is not mentioned in Diagnostic or call log, only physical or IVR extensions are showed up there. 
In the CDRs, āmeetmeā will be in the LASTAPP field and <room_no>| will be stored in the ālastdataā field.