Help understanding fax entries in extensions_additional

[lonelyadmin]

I’m trying to create some extensions that route over to an old PBX we have. Problem is that they seem to already be in use by some auto-generated [ext-fax] section in the
extensions_additional.conf file (excerpt below). I don’t recall ever setting those up, not saying I didn’t though.

Assuming I didn’t do it, where did they come from? How are they used? I can’t seem to find any reference to them poking around in the GUI. Grepping in /etc only shows that extension in that one file.

We strongly discourage faxing but do have to support it at times.

[ext-fax]
include => ext-fax-custom
exten => 146,1,Set(FAX_FOR=John Smith (146))
exten => 146,n,Noop(Receiving Fax for: ${FAX_FOR}, From: ${CALLERID(all)})
exten => 146,n,Set(FAX_RX_USER=146)
exten => 146,n,Set(FAX_RX_EMAIL_LEN=23)
exten => 146,n,ExecIf($["${DB(FAX/146/localstore)}" == "true"]?Set(ARIUSER=146))
exten => 146,n,ExecIf($["${DB(FAX/146/localstore)}" == "true"]?AGI(fax.agi))
exten => 146,n,Gosub(zulu-no-interaction,s,1())
exten => 146,n(receivefax),Goto(s,receivefax)

[lgaetz (Lorne Gaetz)]

You have fax enabled in User Management for user #146.