How to use external relay controller?

[dan]

I am not sure how you plan to control the relays from the Pi without using the GPIO pins but there is a PDF file which lists the HTTP GET commands for SIP on the SIP wiki:
https://github.com/Dan-in-CA/SIP/wiki

Click this link: "SIP HTTP GET Command Reference (download PDF)"
[url=https://github.com/Dan-in-CA/SIP/wiki/SIP_GET_commands.pdf][/url]
Dan