[asterisk-users] What does pct mean?

[Eric Wieling]

Could this gap in sequence numbers caused by a codec change generate 
errors like the one below?

[2018-02-13 12:57:43] WARNING[4917][C-0004c2cb] codec_sangoma.c: 
[526559][g722toulaw] Got Seq 15944 but expecting 10106 (time since last 
read = 0ms), dropped 5838 packets

On 02/13/2018 01:24 PM, Andres wrote:
> On 2/13/18 11:55 AM, Michael Maier wrote:
>> On 02/13/2018 at 08:41 AM Floimair Florian wrote:
>>> No you're reading it wrong.
>>>
>>> There are 188K received with no loss, and 16441K transmitted.
>> This doesn't make any sense to me, either. There can't be more packages
>> transmitted than received. It's the same codec in and out and it's been
>> running exactly the same time.
> Lost and Percent (pct) are not calculated by counting packets. Those 
> are calculated from the sequence numbers in the RTP frame.
>
> For example let's say you start the receiver (Asterisk) at Sequence 
> #1....then something happens and it jumps to sequence #5000.  The 
> audio might be fine, but now the stats say 4998 packets were lost. Why 
> is there a bizarre sequence jump?  Hard to say.  I have seen it 
> because of bugs that eventually get fixed on the CPE, or even when 
> there is a change of codec (or re-invite) mid-call.  I would not worry 
> too much about this unless you can reproduce it and can address it 
> properly at the CPE level.  A packet capture will clearly confirm what 
> I am referring to here. Just look at every Sequence # in the RTP flow 
> and you will see the jump.
>>
>>> ...........Receive......... .........Transmit..........
>>> Count    Lost Pct  Jitter   Count    Lost Pct    Jitter RTT....
>>> 188K      0    0   0.000    188K   16641K 8809   0.000   0.026
>>    ^^^^                        ^^^^
>> There are 188K received and 188K transmitted. Pct is unknown - what's 
>> Pct?
>>
>>
>>> Still 8809 does not sound like a percentage to me 😉 so there is 
>>> something wrong with either the label or the value.
>>>  From what's in the code, you can see it's clearly a lost Packet 
>>> count not a percentage.
>>> So I guess Pct in this case is short for "Packet".
>>>
>>>     With best regards
>>>
>>> Florian Floimair
>>> Innovation - Software-Development
>>>
>>> COMMEND INTERNATIONAL GMBH
>>> http://www.commend.com
>>>
>>> Security and Communication by Commend
>>>
>>> FN 178618z | LG Salzburg
>>>
>>> -----Ursprüngliche Nachricht-----
>>> Von: asterisk-users-bounces at lists.digium.com 
>>> [mailto:asterisk-users-bounces at lists.digium.com] Im Auftrag von 
>>> Michael Maier
>>> Gesendet: Montag, 12. Februar 2018 17:46
>>> An: asterisk-users at lists.digium.com
>>> Betreff: Re: [asterisk-users] What does pct mean?
>>>
>>> Hi Carsten,
>>>
>>> On 02/11/2018 at 07:46 PM Carsten Bock wrote:
>>>> Hi,
>>>>
>>>> Lost percent (%)....
>>> Are you sure? I'm seeing here:
>>>
>>> ...........Receive......... .........Transmit..........
>>> Count    Lost Pct  Jitter   Count    Lost Pct    Jitter RTT....
>>> 188K      0    0   0.000    188K   16641K 8809   0.000   0.026
>>>
>>> => This doesn't sound reliable to me: there are 188K packets and 
>>> 16641K of them are lost?! The Pct value is fluctuating between about 
>>> 6009 and 9009.
>>>
>>> Thanks,
>>> Michael
>>>
>>>
>>>>
>>>> Am 11.02.2018 19:27 schrieb "Michael Maier" <m1278468 at mailbox.org>:
>>>>
>>>>> Hello,
>>>>>
>>>>> could somebody please tell me the meaning of "Pct" as seen in 
>>>>> asterisk cli:
>>>>>
>>>>> ...........Receive......... .........Transmit..........
>>>>> Count    Lost Pct  Jitter   Count    Lost Pct  Jitter RTT....
>>>>>
>>>>>
>>>>> Thanks,
>>>>> Michael
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>>
>
>