SIP

SIP is a TCP-based protocol for ILSes performing basic functions of a library.

The official documentation is here. The documentation for the Evergreen ILS gives a simplified rundown of the SIP message types. The only message we're interested in at the moment is Patron Information, which verifies a patron's credentials and returns information about them.

Although archaic and restricted to barcode/PIN based authentication, SIP is ILS-independent and allows Simplified to present a simple authentication system through HTTP Basic Auth.

Implementations

Evergreen and Koha both use SIPServer as their SIP server implementation.