Allstar acces via cellphone?

Hello someone logged into my Allstar node. instead of a number it gave his callsign.
He advised that he accessed it via his cellphone! called a number and came in that way. anyone heard of anything like this? I am doubting this because he did not want to give the number…

do you use the asl tel portal ?
do you have echolink enabled and running ?

I would say possibly you do not have invalid connects trapped out of your system if it is ringing a extension.
our setup is ‘permit only’ - list of valid nodes registered.

Can’t say more till I know more.