/lib/udev/rules.d/xpp.rules is in dahdi-linux 1:2.5.0.1+dfsg-1ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | # Load firmware into the Xorcom Astribank device:
SUBSYSTEM=="usb", ACTION=="add", \
ENV{PRODUCT}=="e4e4/11[3456][013]/*", ENV{DEVTYPE}!="usb_interface", \
RUN+="/usr/share/dahdi/xpp_fxloader udev $env{PRODUCT}"
# Hotplug hook for Astribank up/down
# If you need this functionality, copy the astribank_hook.sample
# to $XPP_INIT_DIR/astribank_hook
#
# By default XPP_INIT_DIR="/usr/share/dahdi"
KERNEL=="xbus*", RUN+="%E{XPP_INIT_DIR}/astribank_hook udev $kernel $sysfs{status} $sysfs{connector}"
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