What happens inside Asterisk when a shared line key is pressed?
When the key for Shared Line 1 is pressed on the Aastra phone, it causes an INVITE to be sent to Asterisk. The target number of the INVITE will be “8*4003_line1” so it will match the corresponding line in the dial plan and call the command SLAStation(8*4003_line1). What this does depends on what you configured for the “Device” parameter of line1 in SLA.CONF.
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