Hi all I have asterisk 1.4.12 that was working on CCM 4.0 they updated to 6.1.3 and it no longer works. I tried updating to 1.4.26.2 but still not working. I get SIP error 503 service unavailable. The guy says he has MTP enabled etc... Anyone connected to CCM 6.1.3 and have it working? Thanks, Jerry