Note

To call another station after completing a
DISA station call, the internal party must
transfer you. Station and System Page cannot
be accessed on DISA calls.


So yeah ill probably just set a voice assistant port to get called and have a default script it runs which would be something like answer wait for user to push 1 and then have that extension dial #30 something like that.
I don't think they have anything setup for a sip phone on android and I'm sure theirs nothing that even works anymore for android to toshiba system + nothing is setup in the firewall which would make this simple request blown out of proportion with time.