Asterisk error on cent OS

I am trying to use the asterisk server for the first time. I have got a project to build a dialer based on asterisk server. But I started getting errors while using asterisks server. While using the “asterisk” I am getting error:
dahdi-linux-2.4.1.2-1_centos5.x86_64 from asterisk-current has depsolving problems
–> Missing Dependency: dahdi-firmware is needed by package dahdi-linux-2.4.1.2-1_centos5.x86_64 (asterisk-current)
Error: Missing Dependency: dahdi-firmware is needed by package dahdi-linux-2.4.1.2-1_centos5.x86_64 (asterisk-current)
How will I fix this issue?
