Hi Michael,

Thanks you for your input.

I can confirm that inserting a silence stream prior to the recording works in the same way that playing some actual audio does, resulting in a successful recording. Worth noting is that there appears to be a duration threshold where if the duration is too short (in my case <100ms) then the recording come out blank - presumably this is because the stream has not had enough time to prepare the channel before recording starts.

In response to your question the call is a remotely registered VOIP handset (OpenSIPS) dialling directly into FreeSWITCH with all call control handled by ESL. When I stated "initialise the RTP stream for recording" that is my way of trying to communicate that its my understanding that this is what playing the audio file (or silence stream following your comment) was performing in FreeSWITCH.

I feel that you have answered my question however i wanted to post some fs_cli output to confirm that this is expected behaviour (or something I should learn to expect!). The lines in red are what i have called "RTP stream initialise".

Call with a silence stream (This records successfully)

2013-10-01 15:10:35.830044 [DEBUG] switch_ivr.c:612 sofia/internal/3333320116@x-onsip.com Command Execute playback(silence_stream://1000)

EXECUTE sofia/internal/3333320116@x-onsip.com playback(silence_stream://1000)

2013-10-01 15:10:35.830044 [DEBUG] switch_ivr_play_say.c:1308 Codec Activated L16@8000hz 1 channels 20ms

2013-10-01 15:10:35.860032 [DEBUG] switch_core_session.c:998 Send signal sofia/internal/3333320116@x-onsip.com [BREAK]

2013-10-01 15:10:35.880047 [DEBUG] switch_rtp.c:3704 Correct ip/port confirmed.

2013-10-01 15:10:35.880047 [DEBUG] sofia.c:5685 Channel sofia/internal/3333320116@x-onsip.com entering state [ready][200]

2013-10-01 15:10:36.820081 [DEBUG] switch_ivr_play_say.c:1693 done playing file silence_stream://1000

2013-10-01 15:10:36.820081 [DEBUG] switch_ivr.c:612 sofia/internal/3333320116@x-onsip.com Command Execute record(/usr/share/sounds/recordings/test.wav 10 200)

EXECUTE sofia/internal/3333320116@x-onsip.com record(/usr/share/sounds/recordings/test.wav 10 200)

2013-10-01 15:10:36.820081 [DEBUG] switch_ivr_play_say.c:599 Raw Codec Activated

2013-10-01 15:10:36.820081 [DEBUG] switch_core_codec.c:219 sofia/internal/3333320116@x-onsip.com Push codec L16:70

2013-10-01 15:10:39.920081 [DEBUG] switch_core_session.c:998 Send signal sofia/internal/3333320116@x-onsip.com [BREAK]

2013-10-01 15:10:39.940081 [NOTICE] sofia.c:716 Hangup sofia/internal/3333320116@x-onsip.com [CS_EXECUTE] [NORMAL_CLEARING]

Call without a silence stream (This records silence)

2013-10-01 15:13:06.660045 [DEBUG] switch_ivr.c:612 sofia/internal/3333320116@x-onsip.com Command Execute playback(silence_stream://10)

EXECUTE sofia/internal/3333320116@x-onsip.com playback(silence_stream://10)

2013-10-01 15:13:06.660045 [DEBUG] switch_ivr_play_say.c:1308 Codec Activated L16@8000hz 1 channels 20ms

2013-10-01 15:13:06.680011 [DEBUG] switch_ivr_play_say.c:1693 done playing file silence_stream://10

2013-10-01 15:13:06.680011 [DEBUG] switch_ivr.c:612 sofia/internal/3333320116@x-onsip.com Command Execute record(/usr/share/sounds/recordings/test.wav 10 200)

EXECUTE sofia/internal/3333320116@x-onsip.com record(/usr/share/sounds/recordings/test.wav 10 200)

2013-10-01 15:13:06.680011 [DEBUG] switch_ivr_play_say.c:599 Raw Codec Activated

2013-10-01 15:13:06.680011 [DEBUG] switch_core_codec.c:219 sofia/internal/3333320116@x-onsip.com Push codec L16:70

2013-10-01 15:13:06.760081 [DEBUG] switch_core_session.c:998 Send signal sofia/internal/3333320116@x-onsip.com [BREAK]

2013-10-01 15:13:06.780071 [DEBUG] switch_rtp.c:3704 Correct ip/port confirmed.

2013-10-01 15:13:06.780071 [DEBUG] sofia.c:5685 Channel sofia/internal/3333320116@x-onsip.com entering state [ready][200]

2013-10-01 15:13:09.680081 [DEBUG] switch_core_codec.c:244 sofia/internal/3333320116@x-onsip.com Restore previous codec PCMA:8.

2013-10-01 15:13:09.680081 [DEBUG] switch_ivr.c:612 sofia/internal/3333320116@x-onsip.com Command Execute park()

Please do let me know if there is anything interesting about the output i am seeing above or that i should apply caution to!

Thanks,

Callum

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On 1 October 2013 13:21, Michael Jerris <mike@jerris.com> wrote:

On Oct 1, 2013, at 5:51 AM, Callum Guy <callum.guy@x-on.co.uk> wrote:

I am trying to understand how audio streams are initialised in FreeSWITCH. I'm working with ESL (inbound and outbound) and trying to record some audio. Through testing i have proven that audio is working correctly for bridged calls, conferences and file playback however not for single legged audio recording - that is, until I play a file first.

In my example the playback application is executed from an outbound socket, the call is then parked and the inbound socket captures the park event and starts recording. With the playback in place i get audio, and without it I simply get a silent file of the correct duration presumably meaning that the the RTP stream is not active.

You can try a brief silence_stream at the start of the call to address this.

My question therefore is: How can I initialise the RTP stream for recording, without having played a file first? Is there a command for this, or an argument I can pass to the record application?

FreeSWITCH already does this, its likely whatever your talking to does not. What is on the other end of the call.

My objective is to understand how RTP streams are initialised in FreeSWITCH and any input would be greatly appreciated.

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