Unable to get G729 codec works

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Chee-Yang Chau

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Mar 31, 2015, 10:47:43 AM3/31/15

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I am trying to setup an IAX2 trunking on FreePBX using G729 codec only to communicate with Yeastar MyPBX U100. The IAX2 trunk configuration should be fine as it works for ulaw or alaw codec. When I use G729 codec, the MyPBX shows these message:

WARNING[1972]: chan_iax2.c:10395 socket_process: Call rejected by 192.168.0.15: Unable to negotiate codec
NOTICE[5898]: channel.c:3015 __ast_read: Dropping incompatible voice frame on SIP/500-00000573 of format slin since our native format has changed to 0x100 (g729)

This indicates that the G729 codec on FreePBX may has some issue. I then discover my FreePBX may not have G729 codec installed. I try install the G729 codec:

# asterisk -V
Asterisk 11.15.0

# uname -a
Linux pbx.com 2.6.32-431.el6.x86_64 #1 SMP Fri Nov 22 03:15:09 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

# cd ~
# wget http://asterisk.hosting.lv/bin/codec_g729-ast110-gcc4-glibc-x86_64-core2.so
# cd /usr/lib64/asterisk/modules
# mv ~/codec_g729-ast110-gcc4-glibc-x86_64-core2.so codec_g729.so

# /etc/init.d/asterisk restart

And "core show translation" look nice:

pbx*CLI> core show translation
Translation times between formats (in microseconds) for one second of data
Source Format (Rows) Destination Format (Columns)

gsm ulaw alaw g726 adpcm slin lpc10 g729 ilbc g726aal2 g722 slin16 testlaw
gsm - 15000 15000 15000 15000 9000 15000 15000 15000 15000 17250 26250 15000
ulaw 15000 - 9150 15000 15000 9000 15000 15000 15000 15000 17250 26250 15000
alaw 15000 9150 - 15000 15000 9000 15000 15000 15000 15000 17250 26250 15000
g726 15000 15000 15000 - 15000 9000 15000 15000 15000 15000 17250 26250 15000
adpcm 15000 15000 15000 15000 - 9000 15000 15000 15000 15000 17250 26250 15000
slin 6000 6000 6000 6000 6000 - 6000 6000 6000 6000 8250 17250 6000
lpc10 15000 15000 15000 15000 15000 9000 - 15000 15000 15000 17250 26250 15000
g729 15000 15000 15000 15000 15000 9000 15000 - 15000 15000 17250 26250 15000
ilbc 15000 15000 15000 15000 15000 9000 15000 15000 - 15000 17250 26250 15000
g726aal2 15000 15000 15000 15000 15000 9000 15000 15000 15000 - 17250 26250 15000
g722 15600 15600 15600 15600 15600 9600 15600 15600 15600 15600 - 9000 15600
slin16 21600 21600 21600 21600 21600 15600 21600 21600 21600 21600 6000 - 21600
testlaw 15000 15000 15000 15000 15000 9000 15000 15000 15000 15000 17250 26250 -

The incoming setting for IAX2 trunk is:

type=user
context=from-internal
disallow=all
allow=g729

However, after reboot the FreePBX machine and try to dial to a FreePBX extension using IAX2 trunk, I still receive "All curcuit are busy now" prompt:

WARNING[1972]: chan_iax2.c:10395 socket_process: Call rejected by 192.168.0.15: Unable to negotiate codec
NOTICE[5898]: channel.c:3015 __ast_read: Dropping incompatible voice frame on SIP/500-00000573 of format slin since our native format has changed to 0x100 (g729)

Is there anything I miss when configure the G729 codec?

I notice the codec shown in MyPBX and FreePBX are different:

MyPBX U100

MyPBX*CLI> core show codecs

Disclaimer: this command is for informational purposes only.

It does not indicate anything about your configuration.

INT BINARY HEX TYPE NAME DESC

--------------------------------------------------------------------------------

1 (1 << 0) (0x1) audio g723 (G.723.1)

2 (1 << 1) (0x2) audio gsm (GSM)

4 (1 << 2) (0x4) audio ulaw (G.711 u-law)

8 (1 << 3) (0x8) audio alaw (G.711 A-law)

16 (1 << 4) (0x10) audio g726aal2 (G.726 AAL2)

32 (1 << 5) (0x20) audio adpcm (ADPCM)

64 (1 << 6) (0x40) audio slin (16 bit Signed Linear PCM)

128 (1 << 7) (0x80) audio lpc10 (LPC10)

256 (1 << 8) (0x100) audio g729 (G.729A)

512 (1 << 9) (0x200) audio speex (SpeeX)

1024 (1 << 10) (0x400) audio ilbc (iLBC)

2048 (1 << 11) (0x800) audio g726 (G.726 RFC3551)

4096 (1 << 12) (0x1000) audio g722 (G722)

65536 (1 << 16) (0x10000) image jpeg (JPEG image)

131072 (1 << 17) (0x20000) image png (PNG image)

262144 (1 << 18) (0x40000) video h261 (H.261 Video)

524288 (1 << 19) (0x80000) video h263 (H.263 Video)

1048576 (1 << 20) (0x100000) video h263p (H.263+ Video)

2097152 (1 << 21) (0x200000) video h264 (H.264 Video)

FreePBX

pbx*CLI> core show codecs

Disclaimer: this command is for informational purposes only.

It does not indicate anything about your configuration.

ID TYPE NAME DESCRIPTION

-----------------------------------------------------------------------------------

100001 audio g723 (G.723.1)

100002 audio gsm (GSM)

100003 audio ulaw (G.711 u-law)

100004 audio alaw (G.711 A-law)

100011 audio g726 (G.726 RFC3551)

100006 audio adpcm (ADPCM)

100019 audio slin (16 bit Signed Linear PCM)

100007 audio lpc10 (LPC10)

100008 audio g729 (G.729A)

100009 audio speex (SpeeX)

100016 audio speex16 (SpeeX 16khz)

100010 audio ilbc (iLBC)

100005 audio g726aal2 (G.726 AAL2)

100012 audio g722 (G722)

100021 audio slin16 (16 bit Signed Linear PCM (16kHz))

300001 image jpeg (JPEG image)

300002 image png (PNG image)

200001 video h261 (H.261 Video)

200002 video h263 (H.263 Video)

200003 video h263p (H.263+ Video)

200004 video h264 (H.264 Video)

200005 video mpeg4 (MPEG4 Video)

400001 text red (T.140 Realtime Text with redundancy)

400002 text t140 (Passthrough T.140 Realtime Text)

100013 audio siren7 (ITU G.722.1 (Siren7, licensed from Polycom))

100014 audio siren14 (ITU G.722.1 Annex C, (Siren14, licensed from Polycom))

100017 audio testlaw (G.711 test-law)

100015 audio g719 (ITU G.719)

100028 audio speex32 (SpeeX 32khz)

100020 audio slin12 (16 bit Signed Linear PCM (12kHz))

100022 audio slin24 (16 bit Signed Linear PCM (24kHz))

100023 audio slin32 (16 bit Signed Linear PCM (32kHz))

100024 audio slin44 (16 bit Signed Linear PCM (44kHz))

100025 audio slin48 (16 bit Signed Linear PCM (48kHz))

100026 audio slin96 (16 bit Signed Linear PCM (96kHz))

100027 audio slin192 (16 bit Signed Linear PCM (192kHz))

Best regards,

Chee-Yang Chau

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