Digi APPLICATION NOTE 34 - Manual (Page 7)

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Configuration - Interfaces > PPP > PPP 0 - 4 > PPP 4 > Advanced
The PSTN interface needs to be configured so that if PPP 1 (ADSL) is up and in service (i.e. passing data)
then this interface is not allowed to initiate a connection.
Parameter Setting Description
Inhibit auto-activation when these
PPPs are active
1
Inhibit auto-activation of PPP 4 when PPP
1 is active
Inhibit mode
Inhibit if other PPP is
active and not OOS
Only inhibit if PPP 1 is passing data