Need help regarding local policy

I need to distribute outgoing traffic between multiple sessions agents equally using a local policy. How can i do that ?

Right now I am using below :

local-policy
        from-address                            *
        to-address                              *
        source-realm                            A-PBX-LAN
        description                             A LAN TO WAN
        activate-time                           
        deactivate-time                         
        state                                   enabled
        policy-priority                         normal
        policy-attribute
                next-hop                                PRO-SIP-1
                realm                                   External_Vlan70
                action                                  replace-uri
                terminate-recursion                     disabled
                carrier                                 
                start-time                              0000
                end-time                                2400
                days-of-week                            U-S
                cost                                    0
                state                                   enabled
                app-protocol                            
                methods                                 
                media-profiles                          
                lookup                                  multi
                next-key                                
                auth-user-lookup                        
                eloc-str-lkup                           disabled
                eloc-str-match                          
        policy-attribute
                next-hop                                PRO-SIP-2
                realm                                   External_Vlan71
                action                                  replace-uri
                terminate-recursion                     disabled
                carrier                                 
                start-time                              0000
                end-time                                2400
                days-of-week                            U-S
                cost                                    100
                state                                   enabled
                app-protocol                            
                methods                                 
                media-profiles                          
                lookup                                  single
                next-key                                
                auth-user-lookup                        
                eloc-str-lkup                           disabled

But it is not helping, this policy is only sending the outgoing calls to PRO-SIP-1 , not distributing calls equally.