I think the DN11 had several options available, but don't recall much about them. I have one left if you need a look at it.
Paul On Tue, Jun 4, 2019 at 9:57 PM Phil Budne via cctalk <cctalk@classiccmp.org> wrote: > See the v6 dn (IV) man page: > > http://man.cat-v.org/unix-6th/4/dn > > NAME > dn - DN-11 ACU interface > > DESCRIPTION > The dn? files are write-only. The permissible codes are: > > 0-9 dial 0-9 > : dial * > ; dial # > - 4 second delay for second dial tone > = end-of-number > > The entire telephone number must be presented in a single > write system call. > > It is recommended that an end-of-number code be given even > though not all ACU's actually require it. > .... >