BRW, telrad maniac, just noticed your question. I started out at Inter-tel and worked on a lot of various systems, including some Telrads! not much though.

Call manager stuff is pretty simple in reality and 6.1.2 I like even much better than pre 5.0 stuff. You don't need a CCNA to install and maintain a CCM and Unity. I'm not saying you shouldn't get it, by all means get that sucker!