Sip 302 Moved Temporarily

Can someone give me a concrete example of how to do a 302 diversion on an incoming call so that the carrier can forward the call without having to tie up 2 channels on my trunk? I can see this works fine when I set call forwarding on my phones, but I can’t figure out how to do it extensions.conf. I have Level3 as a carrier, and have not been able to get it to work properly for forwarding calls. Thanks.

core show application transfer

Do not use Answer.

Some ITSPs will not honour this. Most will charge you for the forwarded leg.