Our roam times from Wi-Fi to cellular were much longer than the seven to 10 seconds DiVitas promised. We had roam times as short as 45 seconds, but in some instances we were subjected to more than two minutes of hold music. However, this was partly because our PBX interfaced to Syracuse University's Centrex lines, which had an abnormally long 20- to 30-second post-dial delay for long distance.
We experienced varied success in roaming from cellular back to Wi-Fi. The TyTn was the worst offender, but all the handsets failed at least once. Unfortunately, the underpinnings of the roaming algorithm were not available to us, and DiVitas was unable to provide satisfactory explanations for every failure.
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Feature Set
DiVitas offers a few PBX features, including call transfer, hold and abbreviated dialing (that is, just dialing an extension). They all performed well, though transfer and hold only work in Wi-Fi mode. The software also supports basic presence and secure IM between clients. When we lacked data connectivity, any IMs we sent disappeared and we were not notified that they had been lost. DiVitas plans on addressing this in a future release.
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