Avaya IPO 500 trunk with FreePBX

Hello there,

Im new to freePBX and recently have integrated freePBX with Avaya IPO 500. Im able to make internal calls but would like to know how can dial out from Avaya though the freePBX using the FXO lines connected on freePBX.

Can anyone please help me on the configuration required on both side please.

regards,
V