I am putting a T1 on a partner, I have it connected and I can access the the lines, they are 12-21, I have set them for T1-E&M, then I went into the lines area and set them all for DID, then I went into DID mapping and setup my DID's to extensions, but I cannot get the DID to ring the extension, do I have to put the lines 12-21 on the phones or take all lines off the phones?? The customer just wants the DID to ring their phone, and if they are busy have the voicemail answer. Maybe I missed something easy, as I am used to working on Legends/Magix's.