Asterisk GUI: outbound callerid not in users.conf, where?

Every setting for an extension seems to be kept in users.conf, when you make a change in the gui it updates the file. Likewise when using the bulk upload it adds entries to it as expected.

all settings except for outbound caller id

when you add an outbound caller id with the gui, it does not show in users.conf

Where is this setting kept?

how to include it with the bulk upload then if we cant see it in users.conf to figure out the name of the variable.

searched every file in /etc/asterisk with grep, the number entered through the gui is not in any of the files. Is it in a database ?