SIP REFER with UCCE and CUPS SIP Proxy

I am running UCCE 8.0.1 with CVP and CUPS as the SIP proxy.  I am looking to transfer calls to PSTN and release from CVP to free CVP ports.  I am using the rfxxxxxxx method in the ICM script, which seems to work fine from CVP.  However the SIP proxy send an Invite to our SBC instead of a REFER.  Is there a way to configure SIP Proxy to send the REFER instead of the invite?  I would like to release the call from our SBC as well.
The other idea was to insert a custom header in CVP I could then pull out at the SBC and replace with a REFER.  Does anyone have any links to documentation on this?
Thanks
TC

how about check "enable send calls to originator" for the refer label routing in CVP? this would bypass proxy.

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