In bionic, that codec was added by a debian patch:
debian/patches/amr.patch
Description: Add AMR and AMR-WB codec modules supporting transcoding
That patch is present in disco and eoan, but neither have the
codec_arm.so file shipped, nor is codec_amr.c mentioned in their
respective build logs.
There is this difference in the build's configure output:
bionic (with codec):
checking for Encoder_Interface_init in -lopencore-amrnb... yes
checking opencore-amrnb/interf_enc.h usability... yes
checking opencore-amrnb/interf_enc.h presence... yes
checking for opencore-amrnb/interf_enc.h... yes
checking for D_IF_init in -lopencore-amrwb... yes
checking opencore-amrwb/dec_if.h usability... yes
checking opencore-amrwb/dec_if.h presence... yes
checking for opencore-amrwb/dec_if.h... yes
checking for E_IF_init in -lvo-amrwbenc... yes
checking vo-amrwbenc/enc_if.h usability... yes
checking vo-amrwbenc/enc_if.h presence... yes
checking for vo-amrwbenc/enc_if.h... yes
Disco (without):
checking for Encoder_Interface_init in -lopencore-amrnb... yes
checking opencore-amrnb/interf_enc.h usability... yes
checking opencore-amrnb/interf_enc.h presence... yes
checking for opencore-amrnb/interf_enc.h... yes
checking for D_IF_init in -lopencore-amrwb... yes
checking opencore-amrwb/dec_if.h usability... yes
checking opencore-amrwb/dec_if.h presence... yes
checking for opencore-amrwb/dec_if.h... yes
checking for E_IF_init in -lvo-amrwbenc... no
The file codec_amr.so is also not present in the debian buster package:
https://packages.debian.org/buster/amd64/asterisk-modules/filelist
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Server, which is subscribed to the bug report.
https://bugs.launchpad.net/bugs/1845765
Title:
asterisk-modules package built without amr_codec.so
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