I have these very phones and took me a while to figure this out myself.
The phone considers each line registration to be a line with a second
line. So, call line while someone is on a call and another instance
will appear below. That means you only need one registered instance
for the phones to get two incoming calls. If however you want to have a
second registered extension rung if the first is busy, you have to
configure that in Asterisk and the phone so that it moves to the next
Dial command on a busy from the phone. However, to get a busy from the
phone, you have to configure the phone not to have the second ringing
instance for the single registration.
Confused? I was... So... Your phone display looks some6thing like this...
LINE 1> LINE 2> BLAH >
In order to make line 1 toll into line 2, you need to make the phone SIP
back that it is busy when Line 1 is engaged. Default out of the box is
to show the incoming call on line below the current call on line one.
Hi Wiley -
Thanks for the research! I've tried out a couple of the "divert" settings, but haven't yet found one that'll get the IP500's to send a busy message when only one call is active on a line. I'll keep trying, and I'll let you know if I come up with anything. I thought I should let you know, too, that another gentleman showed me a tricky way to accomplish the same end result by using a number of different contexts on the external lines, and then some fancy settings in the dialplan. I'm not sure I understand his configs yet, but he got it to work. If you want those config files, just let me know.
Thanks Again, Noah
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