dialCtlPeerCfgLowerIf 1.3.6.1.2.1.10.21.1.2.1.1.3

ifIndex value of an interface the peer will have to be called on. For example, on an ISDN interface, this can be the ifIndex value of a D channel or the ifIndex value of a B channel, whatever is appropriate for a given peer. As an example, for Basic Rate leased lines it will be necessary to specify a B channel ifIndex, while for semi-permanent connections the D channel ifIndex has to be specified. If the interface can be dynamically assigned, this object has a value of zero.