That doesn't sound entirely normal, but Unity has no control over what calling or called numbers are going to show up. That's a function of CallManager. What calling ID shows up if the forward was a no-answer condition?
If you could reproduce it with only IP phones (no Unity in the picture), then I would say yes. However, it might not be possible to reproduce it with just IP phones; the TSP in Unity is a heck of a lot faster than any human.
Just for grins, try this (you'll need several IP phones)...
With the same call scenario you have described, replace Unity by transferring the call to the busy phone with another IP Phone. Also, instead of forwarding that busy phone to Unity, forward it to another phone (look at the display of this phone after the transfer is done to see what shows up for the calling number).
When doing the transfer to the busy phone from another phone, press tranfser, dial the extension, press transfer again and immediately hang up. That's about as close as you can get to emulating Unity.
I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...
If you have 2 ISR routers, one acting as Failover, do we need to have both the same number of SRST licenses on the 2 routers?
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