GSM Codec in Asterisk: which one exactly is it?


Does anyone know which is the exact GSM codec that Asterisk uses? Does it use several? I can think of these options:

Full Rate
Enhanced Full Rate
Half Rate
AMR X.X (where X.X is some number)

Thanks, bowzee

According to the asterisk sourcecode documentation its the GSM codec from Jutta Degener, TU Berlin/Germany (GSM 06.10 RPELTP).

So it “should” be half rate.

Hi RichardHH,

Thanks for your reply, you solved the issue! There is a slight discrepancy though, the GSM 6.10 codec is the Full Rate one.