For the past month or so I've been having random landline calls drop - some days would be worst than others. There would also be (at times) a lot of crackling noise on the line.

As of this morning my landline is down (i.e. no dial tone) - Have tried all the points. Have also attempted using a corded phone which I kept for emergencies, a Uniden FP098 and I don't get anything at all - not even the background noise, unless I use the optional 4xAAA slot. I'm assuming no power is coming from the exchange?

My VF UFB Cable service is unaffected (Ex TCL Cable wiring - in ChCh). I'm in a old house (Built 1908, phone wiring redone in late 1980s) with an aerial drop type connection. I'm thinking something has gone wrong here due to wear and tear. I do have wiring and maintenance on my VF service however I'm unsure if the aerial drop connection portion would be included in this.

Does it make sense than my landline is down but my UFB service is still up? 

Thanks.