[Freeswitch-dev] Conference call without media

Hi, I am having a specific requirement with respect to conference. I want to transfer a call to an existing conference ignoring media or codec parameters of that call leg. Is there any channel-variable that can be set for this call leg or during transfer so that call is joined to conference even without passing any media or codec information. I can resolve my situation even if there is a way to ignore media transmission (details) when first conference call is created. Thanks & Regards Suneel