How to configure asterisk to support SLA(shared line appear)

I read a topic that asterisk could support shared line appearance(someone call it bridge line appearance). I don’t know if it is just same as the single line extension flow. And I want to test the snom phone’s shared line function.

So,does asterisk’s sla is same as the snom’s and cisco’s barge?

that topic introduce how to use a line and zap to make sla. I just want to make a simple account to test sla,with 3 ip phone. could it possible? What should I do?

I just want to realize the call flow of the single line extension which sample is in the www.tech-invite.com。

I knew that asterisk could support replace with invite, so I want to know that if it supports join to realize the sla-shared line appearance