We have two Call Manager clusters using site codes to dial between. Each site has Unity 5 system with Digital Networking (in UM config).
When user in site A calls user in Site B, we prepend the site code on caller ID, so user in site B can easily call back from call lists and it works great.
The problem is when user in Site A leaves a voicemail message for user in Site B. Since caller ID includes site codes, Unity in site B cannot properly recognize the caller and email delivered to Site B subscriber is "Message from an unidentified caller"....
Obviously, if we stop prepending site codes on caller ID, Unity identification starts working, but then to call back users need to edit the number and prepend the site codes manually....
I had been scratching my head about it, but I can't seem to find a solution that can solve it.
Does anyone have an idea?