Centrex equipment is very old, they don't need relaxdtmf , because it always increases the possibility of "talk-off", they expect humans (aka 2500 like sets and 1A2 racks locally) and not machines to do the dialing, the 80ms dtmf signal often outpaces old Nortel and AT&T switches in the US which are mostly used to provide Centrex service. My suggestions are to better duplicate such human behavior
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