How to force codec transcoding?

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Hi, we are working on a new codec for asterisk. It’s early stages and
the main goal is just to be able to “hear it” using normal client end
points. So what I want is to be able to take a couple of normal G711
extensions, but have asterisk internally force a transcode to my new
codec. In this way we can easily run up a bunch of listening tests with
a wide variety of users very easily

Ok, so how do I force this transcode in the middle, ideally without
using two asterisk boxes?

I clearly need two extensions to have (say) allow=g711, which means I
need to persuade asterisk to route the call via a middle extension which
is set to only allow the new codec. What are my options to achieve
this? (meetme just occurred to me? could that work?) Any suggestions?

Thanks

Ed W