iPhone Voices sound strange on a call

[aphexacid]

has anyone experienced strange sounding effect on the other callers voice on a regular call?

Someone called me the other day, and for the first 5 seconds or so, their voice was time stretched, and then it went super fast, as if to catch up to real time.
This happened to me 2 more times after that.
I’ve never had this before iOS 13.
could it be AT&T being funky?

 

[Helmsley]

Yes, I've had this on the Three network here in the UK. My thoughts is it could be something to do with VoLTE.

 

[aphexacid]

Yes, I've had this on the Three network here in the UK. My thoughts is it could be something to do with VoLTE.

Interesting. Has it happened to you before ios13?

 

[5KDan]

Same thing has happened to me twice in the past few days - once while running 13.1.3, and once again after updating to 13.2. WiFi Calling was enabled both times.

EDIT: I'm using an iPhone XS on T-Mobile USA.