T48G Intercom Auto-answer

[cm21]

Hi Rob,

Thanks for jumping in with some help... you should work for Yealink Support! Your explanation makes perfect sense... However, I'm finding different results. I tried putting in a BLF DSS key as you described. It dials using "intercom" mode correctly, but the BLF indicator doesn't work... always shows grayed-out which it does when the station number being monitored is invalid. This is true for firmware 35.80.0.70 and 35.81.0.15 that I have tested on (the monitoring phone). I'm wondering if perhaps the SIP server you tested against was accepting BLF subscriptions for the extension including the dialing prefix (*80123), and it was all sorted out on the server side?

Thanks for the FAQ link describing the SIP headers... that's what I was looking for. However, I'm wondering if the phones consider "Auto-Answer" and "Intercom" to be two different things, because:
* If I set "Allow Intercom" to Disabled on a phone (and restarted just to be sure), it STILL auto-answers when given that SIP header.
* Also, at least so far, the (new?) features.intercom.headset_prior.enable setting doesn't seem to be having an effect - goal is to force speakerphone for incoming intercom calls.

Any insights?