No Early Media On 302 Redirect Via Two Servers

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We have a situation where we get no early media in this call flow:

VoIP origination provider Server1 (our server)
Customer server Customer phone with call-forward set Server1 to dial the forward-to number

Then there is no early media while the forward-to number is ringing. Our server is Asterisk 1.6 and theirs is 1.8.

I tried promiscredir=yes and then the calls fail altogether because rather than using the local channel, it makes a SIP call that is not allowed. I
don’t think that the FORWARD_CONTEXT variable is used in these versions, because setting it doesn’t impact the channel selection at all.