[cisco-voip] MWI Collisions

[Todd Franklin]

Yesterday we had a failure with the system whereby calls coming in on the
PRI were not happening, but we could call out on the PRI.
The entire event lasted maybe 15 minutes.
When I looked at the Unity event viewer, I see many THOUSANDS of these
during that timeframe (on average it looks like 60 every second were
logged):

"Cisco Unity-CM TSP device 20 (Cisco Unity port 16): An attempt to turn ON
the message waiting indicator (MWI) for extension 1212 failed because a
collision occurred with an incoming call on the same port.

The MWI request will be retried. But to prevent collisions, we recommend
that ports setting MWIs be isolated from ports handling incoming calls. If
the MWI status remains unchanged for an extended period of time or if there
are many of these warnings from Cisco Unity in a short period of time, there
may be an MWI misconfiguration or another problem."

---

Any ideas anyone?  Unity looks quiet today, but this was a bizarre failure
right out of the blue.  If I need to do something to avoid a repeat of this,
I'm more than willing!!

Thanks!
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