Voicemail status as filter

I could use extra status filters for phone voicemail such as ‘not called back’ and ‘called back’. Take callback request as example with 4 filter options. Voicemail only has 1 which is all. For teammates on call it is efficient to have a view with ‘pending voicemails, action needed’. For Team leads it is good to see for monitoring purpose how many voicemails have been left without with and without taken action.