the parameter GRP is not a sequence number, it is the number you dial for the Group Hunt and must be an EX number.
-- i understand that but my question is how they created the other groups 1,2,4,7 where if we dial 1 it goes to one of the extension 60624
60625, 60626. And same if i dial 4 it goes to 62708 or 62709.
What number do you dial to access the Hunt Groups 1, 2, 3 and 4?
-- we dial the hunt group numbers itself 1 or 2.