# freeswitch支持g729编码

> 729编码网络占用会比默认的711要好很多，很多线路都是会建议使用729编码。 729编码可以使用官方的付费方案，据说效率非常好，没有特别要求的也是使用开源版本

本篇介绍的就是开源方案的接入, 这里假设你的环境和我一样(centos7 64位+源码安装freeswitch)

``` linux

# 编译生成 mod_bcg729.so

cd /usr/local/src/freeswitch/src/mod/endpoints

git clone https://github.com/xadhoom/mod_bcg729.git

mv mod_bcg729 mod_g729

cd mod_g729

make

# 覆盖自带的g729编码模块(不支持转码)

mv /usr/lib/freeswitch/mod/mod_g729.so /usr/lib/freeswitch/mod/mod_g729.so.bak

cp mod_bcg729.so /usr/lib/freeswitch/mod/mod_bcg729.so

#在vars.xml配置文件中设置G729编码：

vim /etc/freeswitch/vars.xml

# 在vars.xml配置文件中设置编码协商

# 重新启用g729模块(直接重启也可以)

show codec

unload mod_g729

load  mod_bcg729

```

## 如何查看最终使用了哪个编码

1. 查看话单

``` linux

cat /var/log/freeswitch/cdr-csv/Master.csv | grep 'your phone'

# "Outbound Call","1111","1111","default","2019-10-25 17:57:46","2019-10-25 17:57:56","2019-10-25 17:59:00","74","64","NORMAL_CLEARING","042260af-ab50-4e45-bd18-058a9c9da704","","","G729","G729"

# 最后两个就是协商的编码

```

2. 查看日志

``` linux

cat /var/log/freeswitch/freeswitch.log | grep Codec

57e612d7-ff27-480f-b378-f4579d33bb14 2019-10-25 20:33:15.326441 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [PCMA:8:8000:20:64000:1]/[G729:18:8000:20:8000:1]

57e612d7-ff27-480f-b378-f4579d33bb14 2019-10-25 20:33:15.326441 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [PCMA:8:8000:20:64000:1]/[G722:9:8000:20:64000:1]

57e612d7-ff27-480f-b378-f4579d33bb14 2019-10-25 20:33:15.326441 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [PCMA:8:8000:20:64000:1]/[PCMU:0:8000:20:64000:1]

57e612d7-ff27-480f-b378-f4579d33bb14 2019-10-25 20:33:15.326441 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [PCMA:8:8000:20:64000:1]/[PCMA:8:8000:20:64000:1]

57e612d7-ff27-480f-b378-f4579d33bb14 2019-10-25 20:33:15.326441 [DEBUG] switch_core_media.c:4504 Audio Codec Compare [PCMA:8:8000:20:64000:1] ++++ is saved as a match

# 可以看到一个完整的编码协商过程

```

参考:

[https://blog.csdn.net/swcxy12315/article/details/79571569](https://blog.csdn.net/swcxy12315/article/details/79571569)