Calling Groups and Hunt Groups are really one in the same. Although in a Merlin system they refer to "hunt groups" of extensions as "calling groups". If you download the Feature Reference Manual from the Avaya website for the Processor firmware you have - there will be about a 30-page chapter explaining "calling groups" and how they are set up. Some people refer to Hunt Groups - when talking about Telephone Company lines and how they are usually setup in a "circular" hunt group - both by the Phone companies when ordering multiple business lines - and when your lines are setup in a Pool of lines - when running a phone system in Hybrid/PBX mode.
Tom Daugirdas,
President
STCG, Inc.
stcg.com