Have CME system. Internally works fine transferring to voice mail on busy or noan. PSTN calls to system, likewise no problem. Have a pbx connected via t1 at another site using voip to get calls to cme. Calls work find however on busy or noan disconnect rather than transfer to voice mail. I have allow connections coded for h323 to sip and sip to h323 but it doesn't appear to work. Thoughts thks.