How to test a new codec implemented in asterisk

Hi
can any give me an idea how to test a new codec implemented in asterisk???
I want to test the transcoding as well…
I saw aster stress testiing tool (see below…)

asteriskguru.com/tutorials/astertest.html

but the codecs their in origination and the test server are static…
(the codec i want to test is not in the list)…