We use SIP trunking between our Mitel environment and our Teams environment, with an SBC tying it all together. For calls from Mitel to Teams, the 'From' and 'P-asserted Identity' fields in the SIP INVITE include the calling user's name. We want the DN/extension instead. I've been through the SIP Peer Profile extensively, as well as the COS settings. Nothing! If I can get the DN to show up somewhere in the INVITE, I can massage things in the SBC, but it's nowhere to be found. Any help would be greatly appreciated!
