Yes, using In-Band. But only for call ID. Aspect does not have a way to tun on the MWI. Aspect has an internal voicemail system, and that is the only application that can turn on the MWI. We set the Octel to outcall the Aspect voicemail, and they would get a MWI because the Aspect would record teh Octel outcall prompts as a messae and turn on the MWI. This was a little messy, but it did work. This has also been several years ago, so Aspect may have changed something, so I would check out the MWI stuff for updates. Also, Aspect is not a PBX, it is a ACD system, they do not suport a lot of the traditional PBX features.