I currently have 4 lines coming into the house.  We currently have an Avaya 
standard analog key system which has served us well, but running extensions is 
a major pain and requires a dedicated run per extension.  I have ethernet run 
throughout the house though.

The first two lines are "home" lines, however line1 I use for my consulting 
during the day, and line2 is used by my wife for her work during the day.  
Line3 is a separate business that nobody else in the household should be 
picking up, however I would like to be able to pick it up from any extension if 
required.  Line4 is a fax, but is used for outgoing calls (like conference 
calls, etc.) so that the inbound lines can be left free.

With the current system, I can choose which outbound trunk is used by just 
selecting the line button I prefer.  My wife just picks up the phone for an 
outgoing call and it will choose line2, and if busy then line1.  She would 
never use line3 or line4.  The kids should never touch lines 3 and 4 either.  
They all know enough to only answer lines 1 and 2 and ignore lines 3 and 4, and 
can tell since each line has a different ring as well as the line lights that 
blink.  We also regularly need to be able to "barge" in on each other's calls 
converting a regular call into a conference.

I know what I'm looking for is SLA (Shared Line Appearance), and I've been 
trying to get that working for a couple of weeks.  It supposedly works 
somewhat, but I cannot find enough coherent documentation as to exactly how to 
set up each of the extensions and the physical Polycom phones.  I do see 
there's still bugs being worked on (even today) thats being tested:  
https://issues.asterisk.org/view.php?id=11688

So there's two questions here.  First, is there a way to accomplish the 
requirements I have above to a generic asterisk installation, or are we talking 
a very large and complicated configuration?  Second, is there anywhere I can 
find some detailed documentation on configuring SLA on Polycom phones?  (For 
example, for each line on the Polycom phone, does it log in with an extension 
number or specifically the string "station1_line1", and does the sip.conf get a 
numbered extension for each line on the phone, or do you specifically put 
[statsion1_line1] in there?)

Thanks in advance...


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