I can assure you if you want reliability, Aspect is the way to go. I have been around and I have never heard of Invision. I know there is an outfit that does hosted/managed services called Invsion. Aspect is a major player in the market. It is rare that you go down; and even if you do you have full redundant systems in place to take over without any hiccup.
Invision is the application name for Intervoice, who is a major global player in IVR systems. The advantage with Intervoice is that they work with any PBX/ACD manufacturer, and any back end systems. At my old company, we had Intervoice IVRs tied to Avaya and to I3. If you are a pure Avaya shop, you may benefit from Aspect - one number to call for support, cleaner integration. If you have any other systems, or may acquire and companies with legacy systems, you may benefit from Intervoice. But from what they do, and what the customer experiences, they are both pretty similar.
Sorry - brain fart. Aspect is the PBX/ACD, Invision is an IVR. My bad. Anyway - again, it depends on what you are connecting. Intervoice connects with anyone. Aspect can be trickier to connect to other systems. We are trying to integrate legacy systems into our SAP platform. Aspect requires an additional telephony server to filter our Aspect-only traffic.
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