CUCM 9.1 has included a new edition of the iDivert feature. The legacy iDivert does still exist and is the Default setting in CUCM.

Legacy iDivert allows you to essentially divert incomming calls to your extension to your voicemail. The new iDivert now prompts you with a menu to either divert the call o your voicemail or to the voicemail inbox of the extension that may have forwarded the call to your extension.

Scenario, Phone A with extension 1001 had CFA set to Phone B with extension 1002. A call comes into Phone A which then is forwarded to Phone B. User at Phone sees that this call is originally for Phone A. By pressing iDivert, Phone B has the option to divert the call to either Phone A’s voicemail or Phone B’s voicemail. Phone B user elects to divert the call to Phone A’s mailbox by toggling to Phone A on the iDivert Menu and pressing Select.

NOTE: This will only work if CUC is configured to look at the first redirecting number rather thatn the last redirecting number. (image below) Otherwise the iDivert menu will only be able to divert calls to the their own voicemail inbox.