As part of lab-project (roaming PBX), I’ve compiled SILK and AMR codecs for Asterisk. AMR by googling and researching and SILK following instructions in this repository: https://github.com/mordak/codec_silk.

## Update (20 March, 2013)

Tested SILK8 (SILK-NB) on Android (with CSIPSimple and Bria) – it does not work well, quality is not fantastic definitaly. Have tried both versions: compiled by myself and official Digium SILK codec.

Testing AMR-NB!

## Update #2 (21 March, 2013)

SILK8 are okay with Bria @ android, I had to modify codecs.conf and put following code:

[silk8]
type=silk
samprate=8000
fec=true
packetloss_percentage=10
maxbitrate=20000 ; Default value was 10000
dtx=false        ; Encode using discontinuous transmission mode or not. Turning this
; on will save bandwidth during periods of silence at the cost of
; increased computational complexity. Off by default.


Have little issues with AMR-NB, will post update later.

### Update #2 (15 April, 2013)

AMR-NB works way better, I will try to describe installation steps in a separate post. Quality is amazing and bandwidth it consuming is so little. Unfortunately due to licensing issues it can’t be included as a part of official Asterisk distribution.