Alcatel Unleashed

Someone please to help me. I change today the position of PRA card. Now i can make calls and i can have incoming calls but i can make only one call same time. If i try from 2nd phone same time to make outgoing call i take busy trunk call failed. Which option i have to change?

As I understand - you use OXO system?
In external lines/ list of access - for your access/ details - you can see "No of B-ch". Change B channel quantity