From page 303 of programming ops manual for BCM3.7
Not as conclusive as the 3.0 docs though.
But in direct opposition with a fine wine Nortel does not get better with age.
• Answer with DISA cannot be administer to voice over IP (VoIP), since they do not connect
systems outside the private network. However, a user calling in remotely on another system on
the network can use the trunk to access the system or a user calling in on a PSTN line can use
the trunk to access the private network. To provide control for this type of access, ensure that
you specify remote access packages for the trunk.
This also from 3.7 docs specifically IP Telephony guide
88 Chapter 5 Configuring local VoIP trunks
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You cannot program DISA for voice over IP (VoIP) trunks, therefore, you cannot use COS
passwords to remotely access features over your system. The exception to this would be a
tandemned call, where a call comes into system A over the PSTN, then tandems to system B
over an VoIP trunk. In this case, the remote access package set up for the COS password will
determine which system features are available to the caller.