Anyone know the DIALnet/subnet character to cause a delay in dialing out?

[Shepard@MCKENZIE.S&C.Dialnet.Symbolics.COM (Tom Shepard)]

    Date: Mon, 9 Sep 91 10:28 EDT
    From: pan@ATHENA.PANGARO.dialnet.symbolics.com (Paul Pangaro)

    In the subnets file, isn't there a character to insert in the phonenumber patterns
    to make the modem pause before continuing? This would be used after dialing "9",
    to give the local PBX a chance to return a dialtone before continuing.

    I am pretty sure that there used to be one, but I can't find it in the Rel 8 doc,
    and I dont have sources handy. Any advice most welcome, am trying to gain contact
    with my colleague now on-site at a client. Thanks.

For the CDS224 it's "O".