Sonicwall TZ 500 config for SIP phone traffic

We're a new PureCloud customer and have a SonicWall TZ 500. Our WebRTC phones work great but I can't get our Polycom VVX 400 SIP phones to work (they work from my home LAN but not our corporate LAN). 

We Opened SIP traffic UDP ports 5060-5061 from WAN->LAN in Firewall Access Rules Enabled Consistent NAT in VoIP ->Settings

Any insigt would be appreciated.