We have rolled out tons of UC5xx's with Exchange 2010 UM as the voicemail. We just recently started on our first 89xx/99xx Phone / CME/ISR project and our SCCP phones can call Exchange UM w/o issues however our SIP phones just get a fast busy. No errors are generated on Exchange UM so it would appear its not even making it there.
Would it be possible for you to post your working CME config?
I've had this on a system where it has been configured to 5065 and was working for a week.
Then Exchange goes ahead and recycles itself and restarts on port 5067.
I understand this is normal operation of the service on Exchange.
It should actually work by sending our calls to 5060, then Exchange will send 302 back to CME and instruct it to go back to the currently active port 5065 or 5067. I haven't played too much with this yet, but it didn't seem to work.
I can work around with another dial peer pointing to 5067, but I'd rather get the 302 working properly.
Not sure if you encountered this after you got it working?
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