I want to write a Slack command to open Skype For Business (SfB).
The command will be something along the lines of:
/sfb my.colleague@company.com
SfB recognises the sip
protocol, so I can type sip:my.colleague@company.com
in my browser and it will open a conversation with my colleague in SfB.
However, on inspection of the Slack Integration pages, it seems that commands have to call a public url starting with http://.
There is an official Skype command for Slack, so I assume that what I'm trying to do is possible, and I'm just missing a step.