T48G Intercom Auto-answer

[cm21]

1) So if configuring the DSS Intercom key with the web interface, I would put something like *80123 into the "Value" field and just leave the "Extension" field blank? I've tried that, and one problem is that then the station status (green for idle, red for busy, etc) does not work anymore because of the prefix. Is there a way to configure it to allow using the real extension number for showing station status (BLF), but include the prefix when actually dialing?

2) The same issue applies to a DSS key type of "BLF". So it appears to me that as far as the Yealink phone, there is no difference in how it places the call to Asterisk between a "BLF" key and an "Intercom" key. Either way, it just places a call to the given extension number. Correct? Then the ONLY difference is what icon shows up on the phone's screen?

3) What flags/fields does the phone look for on an incoming call to recognize it as an Intercom call, and utilize the Intercom features? ("Allow Intercom", "Intercom Mute", etc...) I am configuring the Asterisk server, so I need to know what to send to the phone.