FortiClient SSL VPN inter-communication?

Hi,

Can FortiClient SSL VPN talk to each other? We have softphones running on support staff laptop. When they connect from home via FortiClient SSL VPN, they can not call each other via the SoftPhone. The phone server is behind the Fortigate in Datacenter.

So is the inter-communication between SSL VPN Clients supported? If so, any special commands to make it work?