I am going to be putting an STS with voice mail behind a PBX. The PBX is supplying 4 analog extensions that will be going into my CO card. The AA on the voice mail will be answering all incoming calls.

The problem I am going to have is disconnect supervision (Sandman calls it: Open Loop Disconnect or Calling Party Control). When the calling party hangs up, the voice mail never releases the analog port on the PBX.


I found a CPC Generator (MIS1I) from Sandman. I was wondering if anybody has used this product or knows of another product that fixes this problem. The MIS1I only supports one line, so I am going to have to get 4 of these devices. I was hoping that there was a product that was a single unit that accepted multiple lines.

Any help would be appreciated!