Caller ID Name

I'm a little new to telefony but I'm basically using Phono to dial into a Tropo app which redirects to a 3rd party conferencing service. This service shows the names of the participants and their caller IDs. I can implement the caller IDs fine, but the participants "name" is always "SIP-" + their caller ID. I'm trying to override this with a name and I'm not sure what to use. It is purely SIP and I don't need to support anything else, but any attempts to set a SIP header, such as "from", cause it to break... I suspect because there is no "tag" portion in the header I'm sending. Is there an equivalent to :callerID like :callerIDName that can be used to override? Thanks!


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