There are three Cisco IP phones configured for a location. The customer doesn't want Cisco Unity voicemail configured on any of these devices. The customer wants that a Cisco Unity voicemail should be configured on a Dummy device. The call settings on the 3 Cisco IP phones like No Answer Internal/External should be forwarded to the voicemail of that dummy device.
The problem is that if you directly call the Directory Number of dummy device, the voicemail box works but if a call has been forwarded via any of those 3 Cisco IP phones, the voicemail doesn't work.
I hope that someone can help me to sort out this issue.
So what you need can be accomplished in at least two ways. Lets say you want the 3 numbers to route to the Dummy number's Voicemail Box when calls are not answered, you can configure a Voicemail profile (in CCM) for the Dummy number and then apply it to the 3 numbers under Directory Number Configuration > Directory Number Settings > Voice Mail Profile
Or in Unity set up Alternate Extensions so that that the 3 phones are set up as Alternate Extensions for the Dummy mailbox. Sharing a Cisco Unity Voice Mail Box between Two or More IP Phones
Configure Alternate Extensions
Open the Unity System Administrator web page.
Navigate to the subscriber's profile. Select Subscribers > Find and Select a Subscriber > Enter Subscriber Information then click Find and click the Subscriber's name for the subscriber that owns the primary phone (Phone B).
When the subscriber page comes up, select the Alternate Extensions option and click Add.
Enter the alternate extension number (in this case the 3 phones) and click the Save icon.
From this good Unity doc;
Sharing a Cisco Unity Voice Mail Box between Two or More IP Phones
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