[Freeswitch-users] Explanation of rtp_audio_in / out fields in XML CDR's?

Mick Stevens mickstevens at yahoo.com
Wed Dec 5 19:22:31 MSK 2012 

Thank you Steve!

Additional replies still welcome...

Rgds, Mick
 


________________________________
 From: Steven Ayre <steveayre at gmail.com>
To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org> 
Sent: Wednesday, 5 December 2012, 15:20
Subject: Re: [Freeswitch-users] Explanation of rtp_audio_in / out fields in XML CDR's?
 

In vs Out are the 'listening' and 'talking' directions of the channel. They're not the same audio, and as such there's no reason they would match up. Couple that with sending/receiving before the other side, and network jitter/packet loss so that some packets arrive at different times or not at all.

As you point out using codecs can also affect them, as different codecs/ptimes will use different amounts of data/packets for the same time segment. Especially if the codec uses a VBR.

Even using the 'echo' app and matching codec settings they will differ because of timing issues.



On 5 December 2012 10:54, Mick Stevens <mickstevens at yahoo.com> wrote:

Hey Team,
>
>
>Sorry to go on about this, but really keen to understand these RTP fields in the XML CDR's better...
>
>
>1) At the risk of sounding too desperate... Please, please, please can someone explain to me what the <rtp_audio_in_skip_packet_count> & <rtp_audio_out_skip_packet_count> fields indicates?
>
>
>2) Also, for example in the extract below, why are the rtp_audio_in & rtp_audio_out bytes / packet counts not the same? Is this a red herring based on some codec interworking issue or similar, an indication of packet loss or expected/normal behaviour?
>
>
>    <rtp_audio_in_raw_bytes>436848</rtp_audio_in_raw_bytes>
>    <rtp_audio_in_media_bytes>436536</rtp_audio_in_media_bytes>
>    <rtp_audio_in_packet_count>2562</rtp_audio_in_packet_count>
>    <rtp_audio_in_media_packet_count>2538</rtp_audio_in_media_packet_count>
>    <rtp_audio_in_skip_packet_count>1904</rtp_audio_in_skip_packet_count>
>    <rtp_audio_in_jb_packet_count>0</rtp_audio_in_jb_packet_count>
>    <rtp_audio_in_dtmf_packet_count>0</rtp_audio_in_dtmf_packet_count>
>    <rtp_audio_in_cng_packet_count>24</rtp_audio_in_cng_packet_count>
>    <rtp_audio_in_flush_packet_count>0</rtp_audio_in_flush_packet_count>
>    <rtp_audio_in_largest_jb_size>0</rtp_audio_in_largest_jb_size>
>    <rtp_audio_out_raw_bytes>624570</rtp_audio_out_raw_bytes>
>    <rtp_audio_out_media_bytes>624360</rtp_audio_out_media_bytes>
>    <rtp_audio_out_packet_count>3645</rtp_audio_out_packet_count>
>    <rtp_audio_out_media_packet_count>3630</rtp_audio_out_media_packet_count>
>    <rtp_audio_out_skip_packet_count>0</rtp_audio_out_skip_packet_count>
>    <rtp_audio_out_dtmf_packet_count>0</rtp_audio_out_dtmf_packet_count>
>    <rtp_audio_out_cng_packet_count>15</rtp_audio_out_cng_packet_count>
>
>
>Please help! 
> 
> 
>Rgds, Mick
>Tel/SMS. +44(0)7967 594432
>Fax. +44(0)7053 452429
>
>Email/IM. mickstevens at yahoo.com
>Skype: mick_stevens
>www.facebook.com/mickstevens
>www.twitter.com/mickstevens
>
>
>
>
>________________________________
> From: Mick Stevens <mickstevens at yahoo.com>
>
>To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org> 
>Sent: Thursday, 29 November 2012, 20:35
>
>Subject: Re: [Freeswitch-users] Explanation of rtp_audio_in / out fields in XML CDR's?
> 
>
>
>Hi Michael &  Co,
>
>
>Many thanks for the prompt & positive response! Yes, more than happy to collate feedback from the global team & update the wiki accordingly (I'd like to be able to document what the field values between the > < indicate as well as just explain the field names if possible...) +anything else I can do to to contribute to the project...?
>
>
>Yes, now the wiki is back up I've managed to work out that cng_packet = comfort noise generation! Also from the wiki, possibly that the jb in rtp_audio_in_jb_packet_count & rtp_audio_in_largest_jb_size = jitter buffer? (apologies if everybody else already knows this!).
>
>
>To provide the background to my original enquiry, I'm trying to identify if the rtp_audio_in_skip_packet_count in the following XML CDR extract is indicative of packet loss, or perhaps more accurately noticeable audio loss (as the packets haven't been lost, just ignored/"skipped"?: If anybody knows please speak up! 
>
>
>    <rtp_audio_in_raw_bytes>1565066</rtp_audio_in_raw_bytes>
>    <rtp_audio_in_media_bytes>1564856</rtp_audio_in_media_bytes>
>    <rtp_audio_in_packet_count>9113</rtp_audio_in_packet_count>
>    <rtp_audio_in_media_packet_count>9098</rtp_audio_in_media_packet_count>
>    <rtp_audio_in_skip_packet_count>1609</rtp_audio_in_skip_packet_count>
>    <rtp_audio_in_jb_packet_count>0</rtp_audio_in_jb_packet_count>
>    <rtp_audio_in_dtmf_packet_count>0</rtp_audio_in_dtmf_packet_count>
>    <rtp_audio_in_cng_packet_count>15</rtp_audio_in_cng_packet_count>
>    <rtp_audio_in_flush_packet_count>0</rtp_audio_in_flush_packet_count>
>    <rtp_audio_in_largest_jb_size>0</rtp_audio_in_largest_jb_size>
>
>
>Thank you in anticipation of enlightenment!
>
>
>#FreeSWITCH
> 
>Rgds, Mick
>Tel/SMS. +44(0)7967 594432
>Fax. +44(0)7053 452429
>
>Email/IM. mickstevens at yahoo.com
>Skype: mick_stevens
>www.facebook.com/mickstevens
>www.twitter.com/mickstevens
>
>
>
>
>________________________________
> From: Michael Collins <msc at freeswitch.org>
>To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org> 
>Sent: Thursday, 29 November 2012, 19:14
>Subject: Re: [Freeswitch-users] Explanation of rtp_audio_in / out fields in XML CDR's?
> 
>
>Mick,
>
>This data is definitely not on the wiki - or anywhere else that I can see. I think we can crowdsource this to get the info collected and then add it to the mod_xml_curl wiki page. For the record, here's a quick dump of the fields that I took from an XML CDR:
>
>    <rtp_audio_in_raw_bytes>10664</rtp_audio_in_raw_bytes>
>    <rtp_audio_in_media_bytes>8772</rtp_audio_in_media_bytes>
>    <rtp_audio_in_packet_count>62</rtp_audio_in_packet_count>
>    <rtp_audio_in_media_packet_count>51</rtp_audio_in_media_packet_count>
>    <rtp_audio_in_skip_packet_count>18</rtp_audio_in_skip_packet_count>
>    <rtp_audio_in_jb_packet_count>0</rtp_audio_in_jb_packet_count>
>    <rtp_audio_in_dtmf_packet_count>0</rtp_audio_in_dtmf_packet_count>
>    <rtp_audio_in_cng_packet_count>0</rtp_audio_in_cng_packet_count>
>    <rtp_audio_in_flush_packet_count>11</rtp_audio_in_flush_packet_count>
>    <rtp_audio_in_largest_jb_size>0</rtp_audio_in_largest_jb_size>
>    <rtp_audio_out_raw_bytes>11524</rtp_audio_out_raw_bytes>
>    <rtp_audio_out_media_bytes>11524</rtp_audio_out_media_bytes>
>    <rtp_audio_out_packet_count>67</rtp_audio_out_packet_count>
>    <rtp_audio_out_media_packet_count>67</rtp_audio_out_media_packet_count>
>    <rtp_audio_out_skip_packet_count>0</rtp_audio_out_skip_packet_count>
>    <rtp_audio_out_dtmf_packet_count>0</rtp_audio_out_dtmf_packet_count>
>    <rtp_audio_out_cng_packet_count>0</rtp_audio_out_cng_packet_count>
>
>I think raw_bytes, media_bytes, packet_count, and media_packet_count are self-explanatory. I think cng_packet_count is probably self-explanatory too. My question on dtmf_packet_count would be whether it's only for RFC2833 packets (I suspect yes, but would like confirmation). 
>
>If anyone knows these please reply to this email and Mick and I will get them documented on the wiki (right Mick? ;)
>
>rtp_audio_in_skip_packet_count
>rtp_audio_out_skip_packet_count
>rtp_audio_in_jb_packet_count
>rtp_audio_in_flush_packet_count
>rtp_audio_in_largest_jb_size
>
>Thanks all!
>
>-MC
>
>
>On Wed, Nov 28, 2012 at 3:28 AM, Mick Stevens <mickstevens at yahoo.com> wrote:
>
>Hi Folks,
>>
>>
>>I'm trying to use FS XML CDR's to diagnose historic audio problems. I think I can work out some of the rtp_audio_in / out fields (raw bytes & media bytes being nearly equal looks like a good sign) but am wondering about the skip, cng & flush fields for example?
>>
>>
>>I have tried Googling this & can find evidence of other people having asked this question but not of the answer. I have also checked my FS 106 & Cookbook book's without success. The wiki appears to be down at the moment so my apologies if the answer lies there.
>>
>>
>>I know how to do this in real time using wireshark etc but am interested in being able to do some analysis on historic problems reported by customers that aren't willing/able to replicate the problem in order for a protocol trace to be captured.
>>
>>
>>Any help much appreciated!
>> 
>>Rgds, Mick
>>Tel/SMS. +44(0)7967 594432
>>Fax. +44(0)7053 452429
>>
>>Email/IM. mickstevens at yahoo.com
>>Skype: mick_stevens
>>www.facebook.com/mickstevens
>>www.twitter.com/mickstevens
>>
>>_________________________________________________________________________
>>Professional FreeSWITCH Consulting Services:
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>>http://www.freeswitchsolutions.com
>>
>>
>>
>>
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>
>
>-- 
>Michael S Collins
>Twitter: @mercutioviz
>http://www.FreeSWITCH.org
>http://www.ClueCon.com
>http://www.OSTAG.org
>
>
>
>_________________________________________________________________________
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>
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>
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>_________________________________________________________________________
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>
>
>
>
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