Control Inbound/outbound call numbers on SIP/IAX

I need to be able to control the number of inbound and outbound calls a IAX2 peer can make.


                    Incomming           |              Outgoing

Peer 1 1call 1call
Peer2 10calls 1call
Peer3 unlimited 1call
peer4 unlimited 5 calls

so pretty much decide exactly how many incomming and outgoing calls a peer can make. SIP has Incominglimit and Outgoinglimit but how do you control this with IAX2 as I have been unable to find info on this.