Grandstream GXW-4108

Have any of you deployed a Grandstream GXW-4108 on asterisk?

Before I purchase one these, I have a question: I need to be able send a Flash() to get new dial tone after I’ve made one call in my dialplan to cause a 3-way call. Is this ability in GWX-4108 firmware?

legacy pbx station copper <=> GXW-4108 <=> FreePBX via SIP on VPS

Thanks, Bart