Having an issue with our yealink W70p phone (the W70B base and W59rR phone).

It was working until today. We have 3 phones for 3 different extensions. Extension 2 goes to cordless phone 1 (W59R- the one phone that is auto provisioned, the other 2 are manually provisioned). 

The caller cannot hear us but we can hear them. The other 2 phones are not having this issue. 

I am assuming it has to be some kind of setting with the IP address server or something along those lines. Or maybe a setting on the Admin portal?

I could use some help.