I have the a PBX that has a T1 line that goes to my IP412. I have the IP412 connect to IP406 by IP. I am unable to get CID to work on the IP406. Is that because CID can't pass on IP.
in the dial setup (shortcode) to use the IP line you need to set the phone number as .SS and this will forward the caller ID (or number dialed). Check the help and this will have a definitive answer.. This is only via IP calls, otherwise check with your carrier
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