Anything digital is in delay .... listen to digital radio or watch digital tv of a game same time as analogue radio.
Web streaming even more so, to varying degrees from 7 seconds to minutes.
Calling a game via wifi rather than phone line does the same.
Not sure why, just is.
There is solution. ...... add a narrowband broadcast to the stream,
ie on 88.2FM within a couple of km's of the broadcast point
It had already been done at SANFL level both in Adelaide and when LifeFM goes interstate to enable boundary riders to hear the live call for crosses.
No reason why Life FM can't do this as well and then they can do away with ISDN lines just calling wirelessly.
Then it can be promoted that regardless of who is doing the calling at the game
you can hear a LIVE call on 88.2FM