To have had enough of picking up the slack

[Coconuttreee]

I work in a small team completing tasks in regards to different clients. Part of my role involves answering incoming calls/returning voicemails. The whole team is meant to answer but me and my colleague are the "front line" who should be answering first.

This is my aibu.... Say colleague never seems to answer calls either in office or wfh. I am then left to do all call backs as they hardly do these either. It has happened again today. I did then ask last week so decided this morning I'd had enough. We then had a call from our team lead asking if we cloud deal with the calls if not already.... Who gets left to do that? Me.

Same story now this afternoon. I know AIBU in not answering and especially as I do believe in good service however AIBU for my reason why.
In the same vein I will be raising it with our manager as it's got to the point I'd rather just leave as I don't anticipate anything will change (i.e work getting done so doesn't matter who picks it up!)

Are you struggling with the volume of work or is it just the principle of it?
If you are struggling to keep up, I'd be inclined to just do what you are able to. If you are keeping up with the volume of work without any input from your colleague then I would be questioning whether her position is needed.
Either way I'd lobby the management for some sort of a log of the work completed. Make it look as though it is vital for handover and smooth business operation or something. This will soon highlight who does what.