[Freeswitch-users] Codec Mismatch Because of Different Frame Size

Jan Riedinger riedinger at sns.eu
Thu Sep 30 03:25:19 PDT 2010 

  I'm using the following configuration:

vars.xml:
<X-PRE-PROCESS cmd="set" 
data="global_codec_prefs=G729,PCMU,PCMA,G723,G7221 at 32000h,G7221 at 16000h,G722,GSM"/>
<X-PRE-PROCESS cmd="set" 
data="outbound_codec_prefs=G729,PCMU,PCMA,G723,GSM"/>

external.xml (my standard sip profile):
<param name="inbound-codec-negotiation" value="greedy"/>
<param name="inbound-late-negotiation" value="false"/>
<param name="disable-transcoding" value="true"/>

With this configuration I want to restrict the allowed codecs, force the 
usage of G729 as first choice, if available and to minimize the calls 
with transcoding.  I don't want to force the usage of a specific frame size.

Now a lot of calls get rejected with "incompatible destination" by 
FreeSwitch, because the frame size of the incoming calls differs from 
the Freeswitch default (mostly 20 ms), see the debug log below.

Is this the intended behaviour? If it is, how can I circumvent it? Do I 
have to list every codec with every possible frame size in the 
global_codec_prefs list?

Thank you in advance
        Jan

2010-09-30 10:25:45.798068 [DEBUG] sofia.c:4469 Channel 
sofia/external/0049xxx at X.X.X.X entering state [received][100]
2010-09-30 10:25:45.798068 [DEBUG] sofia.c:4480 Remote SDP:
v=0

o=- 554229 1 IN IP4 X.X.X.X

s=-

c=IN IP4 X.X.X.X

t=0 0

a=sendrecv

m=audio 26044 RTP/AVP 18 4 0 8 96 101

a=fmtp:18 annexb=yes

a=rtpmap:96 G726-32/8000

a=rtpmap:101 telephone-event/8000

a=ptime:60

a=silenceSupp:off - - - -


2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [G729:18:8000:60:0]/[G729:18:8000:20:8000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [G723:4:8000:60:0]/[G729:18:8000:20:8000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [PCMU:0:8000:60:0]/[G729:18:8000:20:8000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [PCMA:8:8000:60:0]/[G729:18:8000:20:8000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [G726-32:96:8000:60:0]/[G729:18:8000:20:8000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [telephone-event:101:8000:60:0]/[G729:18:8000:20:8000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4335 Set 2833 
dtmf send/recv payload to 101
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [G729:18:8000:60:0]/[PCMU:0:8000:20:64000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [G723:4:8000:60:0]/[PCMU:0:8000:20:64000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [PCMU:0:8000:60:0]/[PCMU:0:8000:20:64000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [PCMA:8:8000:60:0]/[PCMU:0:8000:20:64000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [G726-32:96:8000:60:0]/[PCMU:0:8000:20:64000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [telephone-event:101:8000:60:0]/[PCMU:0:8000:20:64000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4335 Set 2833 
dtmf send/recv payload to 101
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [G729:18:8000:60:0]/[PCMA:8:8000:20:64000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [G723:4:8000:60:0]/[PCMA:8:8000:20:64000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [PCMU:0:8000:60:0]/[PCMA:8:8000:20:64000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [PCMA:8:8000:60:0]/[PCMA:8:8000:20:64000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [G726-32:96:8000:60:0]/[PCMA:8:8000:20:64000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [telephone-event:101:8000:60:0]/[PCMA:8:8000:20:64000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4335 Set 2833 
dtmf send/recv payload to 101
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [G729:18:8000:60:0]/[G7221:115:32000:20:48000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [G723:4:8000:60:0]/[G7221:115:32000:20:48000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [PCMU:0:8000:60:0]/[G7221:115:32000:20:48000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [PCMA:8:8000:60:0]/[G7221:115:32000:20:48000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [G726-32:96:8000:60:0]/[G7221:115:32000:20:48000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [telephone-event:101:8000:60:0]/[G7221:115:32000:20:48000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4335 Set 2833 
dtmf send/recv payload to 101
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [G729:18:8000:60:0]/[G7221:107:16000:20:32000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [G723:4:8000:60:0]/[G7221:107:16000:20:32000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [PCMU:0:8000:60:0]/[G7221:107:16000:20:32000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [PCMA:8:8000:60:0]/[G7221:107:16000:20:32000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [G726-32:96:8000:60:0]/[G7221:107:16000:20:32000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [telephone-event:101:8000:60:0]/[G7221:107:16000:20:32000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4335 Set 2833 
dtmf send/recv payload to 101
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [G729:18:8000:60:0]/[G722:9:8000:20:64000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [G723:4:8000:60:0]/[G722:9:8000:20:64000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [PCMU:0:8000:60:0]/[G722:9:8000:20:64000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [PCMA:8:8000:60:0]/[G722:9:8000:20:64000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [G726-32:96:8000:60:0]/[G722:9:8000:20:64000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [telephone-event:101:8000:60:0]/[G722:9:8000:20:64000]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4335 Set 2833 
dtmf send/recv payload to 101
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [G729:18:8000:60:0]/[GSM:3:8000:20:13200]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [G723:4:8000:60:0]/[GSM:3:8000:20:13200]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [PCMU:0:8000:60:0]/[GSM:3:8000:20:13200]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [PCMA:8:8000:60:0]/[GSM:3:8000:20:13200]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [G726-32:96:8000:60:0]/[GSM:3:8000:20:13200]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4233 Audio Codec 
Compare [telephone-event:101:8000:60:0]/[GSM:3:8000:20:13200]
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4335 Set 2833 
dtmf send/recv payload to 101
2010-09-30 10:25:45.798068 [DEBUG] sofia_glue.c:4335 Set 2833 
dtmf send/recv payload to 101
2010-09-30 10:25:45.799052 [DEBUG] 
switch_core_state_machine.c:314 (sofia/external/0049xxx at x.x.x.x) Running 
State Change CS_NEW
2010-09-30 10:25:45.799052 [DEBUG] 
switch_core_state_machine.c:320 (sofia/external/0049xxx at x.x.x.x) State NEW
2010-09-30 10:25:45.799052 [DEBUG] switch_channel.c:2359 
(sofia/external/0049xxx at x.x.x.x) Callstate Change DOWN -> HANGUP
2010-09-30 10:25:45.799052 [DEBUG] 
switch_core_state_machine.c:314 (sofia/external/0049xxx at x.x.x.x) Running 
State Change CS_HANGUP
2010-09-30 10:25:45.799052 [NOTICE] sofia.c:4686 Hangup 
sofia/external/0049xxx at x.x.x.x [CS_NEW] [INCOMPATIBLE_DESTINATION]






-- 
Jan Riedinger                           Phone :  +49-30-39 73 19 66
Dipl.-Inf. | Managing Director          Fax   :  +49-30-39 73 19 64
                                         E-Mail:  riedinger at sns.eu
SNS Consult GmbH                        ICQ   :  163-237-041
Südwestkorso 49a                        MSN   :  jan at sns-consult.de
14197 Berlin GERMANY                    Skype :  Jan Riedinger

AG Charlottenburg - HRB 71973

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