[Asterisk-Users] wav instead of gsm for vm-sounds?

[Kevin P. Fleming]

Damon Estep wrote:

> Is there a reference of codec to preferred format somewhere? What is the
> best format match for g.711u?

They are all pretty obvious:

G.711 mu-law: ulaw (or ul)
G.711 A-law: alaw (or al)
GSM: gsm
G.729: g729
Signed Linear (raw): sln (or raw)

Just look at the source files in the formats directory to see which 
extensions map to which formats.