[Freeswitch-users] Codec negotiation issue

[Mickael Hubert]

Hi list,
I have an issue with the negociation codec in my Freeswitch.

I followed this doc: https://wiki.freeswitch.org/wiki/Codec_Negotiation

The call flow:

1) INVITE: UAC -- (G729, PCMA) --> FS -- (G729, PCMA) --> SVI Asterisk
2) 200OK UAC <-- (G729) -- FS <-- (PCMA) -- SVI Asterisk (HOMER)

I have inherit_codec=true in my dialplan and inbound-late-negotiation true
in sip-profile.
But freeswitch do not force codec learned from leg B to leg A.

*LEG B (200OK):*



*2016-04-01 11:28:16.453784 [DEBUG] switch_core_media.c:3194 Audio Codec
Compare [PCMA:8:8000:150:64000]/[G729:18:8000:20:8000]2016-04-01
11:28:16.453784 [DEBUG] switch_core_media.c:3194 Audio Codec Compare
[PCMA:8:8000:150:64000]/[PCMA:8:8000:20:64000]2016-04-01 11:28:16.453784
[DEBUG] switch_core_media.c:3248 Audio Codec Compare [PCMA:8:8000:20:64000]
++++ is saved as a match2016-04-01 11:28:16.453784 [DEBUG]
switch_core_codec.c:111 sofia/internal/06********@HOMER Original read codec
set to PCMA:8*

LEG B is in G711A, OK, next:

2016-04-01 11:28:16.453784 [NOTICE] sofia.c:6727 Channel
[sofia/internal/06*******@HOMER] has been answered
2016-04-01 11:28:16.453784 [DEBUG] switch_channel.c:3686
(sofia/internal/06*********@HOMER) Callstate Change DOWN -> ACTIVE
2016-04-01 11:28:16.473813 [DEBUG] switch_ivr_originate.c:412 *Setting
codec string on sofia/external/0326793005 at 1.1.1.1 <0326793005 at 1.1.1.1> to
PCMA at 8000h@20i*

We can see, FS set the correct codec to LEG A; good ! , next...






*2016-04-01 11:28:16.473813 [DEBUG] switch_core_media.c:3194 Audio Codec
Compare [G729:18:8000:20:8000]/[G729:18:8000:20:8000]2016-04-01
11:28:16.473813 [DEBUG] switch_core_media.c:3248 Audio Codec Compare
[G729:18:8000:20:8000] ++++ is saved as a match2016-04-01 11:28:16.473813
[DEBUG] switch_core_media.c:3194 Audio Codec Compare
[PCMA:8:8000:20:64000]/[PCMA:8:8000:20:64000]2016-04-01 11:28:16.473813
[DEBUG] switch_core_media.c:3248 Audio Codec Compare [PCMA:8:8000:20:64000]
++++ is saved as a match2016-04-01 11:28:16.473813 [DEBUG]
switch_core_media.c:2139 Set Codec sofia/external/0326793005 at 1.1.1.1
<0326793005 at 1.1.1.1> G729/8000 20 ms 160 samples 8000 bits*
Why FS compare and re set a new codec (G729) ?

Next:


*2016-04-01 11:28:16.613776 [ERR] mod_g729.c:145 This codec is only usable
in passthrough mode!2016-04-01 11:28:16.613776 [ERR] switch_core_io.c:1245
Codec G.729 decoder error!*

normal ....

*For informations:*
- FreeSWITCH Version 1.5.8b+git~20140214T000311Z~fe2a4d6d47~64bit (git
fe2a4d6 2014-02-14 00:03:11Z 64bit)

Is it a bug ? an configuration error ?

Thanks in advance


PS:

*My dialplan:*




*<condition field="${destination_number}" expression="^0([1-79][0-9]{8})$"
break="on-true"><action application="export"
data="codec_string=${ep_codec_string}"/><action application="set"
data="inherit_codec=true"/><action application="bridge"
data="sofia/internal/${destination_number}@HOMER"/></condition>*



-- 
Cordialement

HUBERT Mickaël
Ingénieur VOIP - Hexanet

-- 

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