Which codes use GSM modem

Joined: Fri 06 of Jan, 2017

Which codes use GSM modem

Posted:Fri 06 of Jan, 2017 (17:36 UTC)
Hello to all!

Which rules Asterisk use when get incoming call from GSM modem connected to server?

My GSM modem Huawei E1550.
When the call is active i have run this command:

core show channel Dongle/1212

NativeFormats: (slin)
WriteFormat: slin
ReadFormat: slin

What if I want to use another codec in this channel? If f.i. g711 will be prefer if on another end user dont have slin decoder.

Maybe i dont fuly understand how Asterisk use codecs. Sorry.