[Asterisk-Users] Bri problem

[Altus Snyman]

Good day all
I've installed a few systems with quad/octo bri cards
On these systems incoming numbers are ether the full number,example
12345657 or ether the last 4 digits,example 7654
But for some reason the latest installation incoming numbers comes in as
extension "s"??
Is this something to do with the telecoms provider or a asterisk config?
Please Help ore advice
Thanks
Altus