I'm running into a redesign issue because of budget. Currently, I have this:
1 Unity (main office)
2 Active Directory Sites (main & branch office)
1 Exchange server (main office)
We're going to be installing a 2nd Exchange server in our branch office and I proposed adding another Unity server at the branch office. Management does not have the budget for another Unity server and asked that I have the branch office Exchange users use the Unity server in the main office. The WAN connection is 45Mbps DS3.
They proposed this design:
1 Unity (main office)
2 Active Directory Sites (main and branch office)
2 Exchange (main and branch office)
What sort of problems should I explain to management the branch office might experience by having their Exchange and Unity across the WAN?
You can do this fine. I have designed a couple hub and spoke Unity designs. Unity is at the hub, next to an Exchange server. The remote sites vary from 5 subscribers to 100. You just need the bandwidth capacity to handle CallHandlers and voicemails. If you are using UM, it's better because everyone will stream out of Exchange, rather than using Unity port and TSP. (Outlook/Exchange has the wav file, they use media player or the builtin outlook snapin to play the file)
If the remote user picks up the phone to check VM, then you need the QOS and bandwidth for this to happen. Design your WAN accordingly and you should be fine.
Have the secondary Exchange server is not a big deal. It is a little odd for Unity to have this because it's offsite. Cisco normally does not recommend this because the time required for MWI services, etc to read the Exchange databases for new/read messages. If the roundtrip times are slow for some reason, the MWI may or may not light the lamp. Sounds like your bandwidth is good, but still provision it accordingly for voice.
Create your Exchange servers and Site links. This will cut down on replications in AD, etc.
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?
No. You will only need the SRST licenses on the primary router. Because this feature...