I'm looking to spec out a 38xx replacement for a 3640 and am reviewing the 3640 config. In the config it has voice-ports 3/0/0-3/0/7 and then 3/0/14-
3/0/17. Show dial indicates that sot 3 is an NM-HDA-4FXS. I'm trying to a) figure out the physical what the external interface is on slot 3 (is it an 25 pair RJ-21) b) Why is there not a 3/0/8-3/0/13 port range. From that, I can figure out whether I can just move this module into the new 38XX so I don't have to worry about terminations if it is an RJ-21 interface.