[Freeswitch-users] Garbled audio solved on polycom phone

[Karl Schmidt]

Play back of audio with the 'playback' command produced garbled audio.  First, I found a message 
complaining that the sample rate was 8K instead of 16K - re-sampling brought no joy. (This begs the 
questions - what is the best audio format for playback of messages? File type - sample rate? etc  -
If I record via the 'record' application, the file is :
Sample Rate    : 8000
Precision      : 16-bit
Bit Rate       : 128k
Sample Encoding: 16-bit Signed Integer PCM

But is seems to expect 16000 sample rates to play back? What is the internal audio traffic in 
freeswitch based on? )


<back to main issue >


Then I noticed that the garbling occurred on a polycom IP560 phone as the zrtp utils messages were 
getting dumped in the log.

Doing a

  global_setvar zrtp_secure_media=false

Fixes the problem.  Seems like this should fail more gracefully?

I have the latest Debian - 1.2.12~2-1~wheezy+1

( Placing       <variable name="zrtp_secure_media" value="false" /> in the directory entry also 
fixes the problem )





EXECUTE sofia/internal/11 at hostname playback(mysounds/answer.wav)
2013-10-10 00:53:44.989857 [DEBUG] switch_ivr_play_say.c:1315 Codec Activated L16 at 16000hz 1 channels 
20ms
2013-10-10 00:53:45.010017 [DEBUG] switch_core_session.c:999 Send signal sofia/internal/11 at hostname 
[BREAK]
2013-10-10 00:53:45.010017 [DEBUG] switch_core_session.c:999 Send signal sofia/internal/11 at hostname 
[BREAK]
2013-10-10 00:53:45.010017 [DEBUG] switch_core_session.c:999 Send signal sofia/internal/11 at hostname 
[BREAK]
2013-10-10 00:53:45.029906 [DEBUG] sofia.c:5720 Channel sofia/internal/11 at hostname entering state 
[ready][200]
2013-10-10 00:53:45.049900 [DEBUG] switch_rtp.c:928  [  zrtp utils]:    Send <HELLO> ssrc=307819312 
seq=36849 size=144. Stream 39:CLEAR:START
2013-10-10 00:53:45.129740 [DEBUG] switch_rtp.c:3706 Correct ip/port confirmed.
2013-10-10 00:53:45.149778 [DEBUG] switch_rtp.c:928  [  zrtp utils]:    Send <HELLO> ssrc=307819312 
seq=36850 size=144. Stream 39:CLEAR:START
2013-10-10 00:53:45.349846 [DEBUG] switch_rtp.c:928  [  zrtp utils]:    Send <HELLO> ssrc=307819312 
seq=36851 size=144. Stream 39:CLEAR:START
2013-10-10 00:53:45.549840 [DEBUG] switch_rtp.c:928  [  zrtp utils]:    Send <HELLO> ssrc=307819312 
seq=36852 size=144. Stream 39:CLEAR:START
2013-10-10 00:53:45.749841 [DEBUG] switch_rtp.c:928  [ zrtp engine]: WARNING! HELLO have been resent 
5 times without a response. Raising ZRTP_EVENT_NO_ZRTP_QUICK event. ID=39
2013-10-10 00:53:45.749841 [DEBUG] switch_rtp.c:928  [  zrtp utils]:    Send <HELLO> ssrc=307819312 
seq=36853 size=144. Stream 39:CLEAR:START
2013-10-10 00:53:45.949840 [DEBUG] switch_rtp.c:928  [  zrtp utils]:    Send <HELLO> ssrc=307819312 
seq=36854 size=144. Stream 39:CLEAR:START
2013-10-10 00:53:46.149819 [DEBUG] switch_rtp.c:928  [  zrtp utils]:    Send <HELLO> ssrc=307819312 
seq=36855 size=144. Stream 39:CLEAR:START
2013-10-10 00:53:46.349793 [DEBUG] switch_rtp.c:928  [  zrtp utils]:    Send <HELLO> ssrc=307819312 
seq=36856 size=144. Stream 39:CLEAR:START
2013-10-10 00:53:46.549841 [DEBUG] switch_rtp.c:928  [  zrtp utils]:    Send <HELLO> ssrc=307819312 
seq=36857 size=144. Stream 39:CLEAR:START
2013-10-10 00:53:46.749792 [DEBUG] switch_rtp.c:928  [  zrtp utils]:    Send <HELLO> ssrc=307819312 
seq=36858 size=144. Stream 39:CLEAR:START
2013-10-10 00:53:46.969846 [DEBUG] switch_rtp.c:928  [  zrtp utils]:    Send <HELLO> ssrc=307819312 
seq=36859 size=144. Stream 39:CLEAR:START
2013-10-10 00:53:47.169786 [DEBUG] switch_rtp.c:928  [  zrtp utils]:    Send <HELLO> ssrc=307819312 
seq=36860 size=144. Stream 39:CLEAR:START
2013-10-10 00:53:47.369841 [DEBUG] switch_rtp.c:928  [  zrtp utils]:    Send <HELLO> ssrc=307819312 
seq=36861 size=144. Stream 39:CLEAR:START
2013-10-10 00:53:47.569842 [DEBUG] switch_rtp.c:928  [  zrtp utils]:    Send <HELLO> ssrc=307819312 
seq=36862 size=144. Stream 39:CLEAR:START
2013-10-10 00:53:47.769850 [DEBUG] switch_rtp.c:928  [  zrtp utils]:    Send <HELLO> ssrc=307819312 
seq=36863 size=144. Stream 39:CLEAR:START
2013-10-10 00:53:47.969844 [DEBUG] switch_rtp.c:928  [  zrtp utils]:    Send <HELLO> ssrc=307819312 
seq=36864 size=144. Stream 39:CLEAR:START
2013-10-10 00:53:48.169838 [DEBUG] switch_rtp.c:928  [  zrtp utils]:    Send <HELLO> ssrc=307819312 
seq=36865 size=144. Stream 39:CLEAR:START
2013-10-10 00:53:48.369839 [DEBUG] switch_rtp.c:928  [  zrtp utils]:    Send <HELLO> ssrc=307819312 
seq=36866 size=144. Stream 39:CLEAR:START
2013-10-10 00:53:48.569849 [DEBUG] switch_rtp.c:928  [  zrtp utils]:    Send <HELLO> ssrc=307819312 
seq=36867 size=144. Stream 39:CLEAR:START
2013-10-10 00:53:48.769843 [DEBUG] switch_rtp.c:928  [ zrtp engine]: WARNING! HELLO Max 
retransmissions count reached (20 retries). ID=39
2013-10-10 00:53:48.769843 [DEBUG] switch_rtp.c:928  [        zrtp]:    Stream ID=39 CLEAR switching 
<START> ---> <NOZRTP>.
2013-10-10 00:53:51.569844 [DEBUG] switch_core_session.c:999 Send signal sofia/internal/11 at hostname 
[BREAK]



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Karl Schmidt                                  EMail Karl at xtronics.com
Transtronics, Inc.                              WEB http://secure.transtronics.com
3209 West 9th Street                             Ph (785) 841-3089
Lawrence, KS 66049                              FAX (785) 841-0434

Borrow money from pessimists - they don't expect it back.
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