Here are the codecs can instantly change to without a build.
G. 711 (64 kbps)
G. 729 (8 kbps)
G. 723.1 (6.3 kbps)
G. 723.1 (5.3 kbps)
G. 726 (32 kbps)
G. 726 (24 kbps)
G. 728 (16 kpbs)
Now to decide which would be more appropriate. Also need to check if single audio channel or concurrent sep. channels is best. The test duration has been increased from 10 to 25 seconds. For satellite users I may increase that to 45 seconds for grins.