When your're on a call, you press Conference, get internal dial tone, dial the extension you want or 9 plus the whole outside number you want, then press Conference again to tie the calls together. Some exts only have access to one call at a time, so if you can't make 2 calls at a time, this feature won't work.
SOURCE: Programming speed dial numbers into NEC DTU-32D-1A phone
hit feature key,hit a line key,dial 9 plus the number,hit feature
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