Only getting one-way VoIP through Sonicwall

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    Hi, my first post!

    I could do with some help. We have purchased a Dell Sonicwall TZ500 and I-, having problems getting VoIP to work fully.
    The PBX is cloud based and I have allowed all the relevant SIP UDP ports for inbound (Outbound is open).

    The phone registers ok and when making a test call, I can hear them but they cant hear me.
    From what I can gather I need to set up a NAT policy(s) but have no idea what to do!

    Thanks
    Sebtuttino

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