How do I pass RTP traffic of an IPSec VPN created with Fortigate equipment

I have a IPSec VPN created between 2 Fortigate devices.  The phone system is a ShoreTel system.  I have a data VLAN and a voice VLAN.  I can ping everywhere.  I have a ShoreGear90 at each location.  The ShoreGear90s can see each other and register with the Headquarter Server.  I can call locally, but when I try to call an extension on the other side of the VPN the RTP traffic is rejected.  I ran WireShark to validate this.  I have the ports for the RTP traffic dynamicallly assigned.  I can tie the RTP traffic down to a single port-5004.
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I'd bet the fortigate device is not permitting that RTP traffic over the vpn for some reason.  I've often seen VPN settings to "enable XXX pass-through".   Might want to look for one of those settings, or contact fortigate about it.

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