[SR-Users] how to track down issue with shared lines

[mark li]

I have a scenario where calls that are transferred to a shared line doesn't trigger the "in use" light to show up on both phones that have the shared line. 
but when i make an outgoing call, let's say, using the shared line, the "in use" light lights up on both phones that have the shared line. 
Phone - polycom 650s.
Just a noob with SIP, kamailio and telecom, so not sure where to start debugging. 

Any suggestions would be appreciated. 

thanks in advance for your time. 
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