[asterisk-users] RTP address learning and timing problem

Wed Apr 19 19:36:51 CDT 2023

Thank you Joshua.

On Tue, 18 Apr 2023 at 21:18, Joshua C. Colp <jcolp at sangoma.com> wrote:

> I don't know in that specific output what happened. Your best course of
> action is to add further logging or step through the logic with all of the
> knowledge you have of the RTP streams to understand what is happening.
>
> On Mon, Apr 17, 2023 at 8:52 PM David Cunningham <
> dcunningham at voisonics.com> wrote:
>
>> Hi Joshua,
>>
>> Thank you for that. From the code it kind of looks like
>> STRICT_RTP_LEARN_TIMEOUT is a minimum, not a maximum:
>>
>> if (!ast_sockaddr_isnull(&rtp->strict_rtp_address)
>> && STRICT_RTP_LEARN_TIMEOUT < ast_tvdiff_ms(ast_tvnow(),
>> rtp->rtp_source_learn.start)) {
>> ast_verb(4, "%p -- Strict RTP learning complete - Locking on source
>> address %s\n",
>>
>> Our call shows:
>>
>> # grep C-00024cd5 full.log | egrep 'Strict RTP'
>> [Feb 22 11:16:41] VERBOSE[29023][C-00024cd5] res_rtp_asterisk.c:        >
>> 0x2b308c074f80 -- Strict RTP learning after remote address set to:
>> xx.xx.154.111:18578
>> [Feb 22 11:17:00] VERBOSE[29023][C-00024cd5] res_rtp_asterisk.c:        >
>> 0x2b315c01cbc0 -- Strict RTP learning after remote address set to:
>> xx.xx.0.12:16498
>> [Feb 22 11:17:00] VERBOSE[28191][C-00024cd5] res_rtp_asterisk.c:        >
>> 0x2b308c074f80 -- Strict RTP switching to RTP remote address
>> xx.xx.154.111:18578 as source
>> [Feb 22 11:17:00] VERBOSE[28191][C-00024cd5] res_rtp_asterisk.c:        >
>> 0x2b308c074f80 -- Strict RTP learning complete - Locking on source address
>> xx.xx.154.111:18578
>> [Feb 22 11:17:00] VERBOSE[28194][C-00024cd5] res_rtp_asterisk.c:        >
>> 0x2b315c01cbc0 -- Strict RTP switching source address to xx.xx.114.237:16498
>> [Feb 22 11:17:01] VERBOSE[28194][C-00024cd5] res_rtp_asterisk.c:        >
>> 0x2b315c01cbc0 -- Strict RTP learning complete - Locking on source address
>> xx.xx.114.237:16498
>>
>> I'm a bit confused because the second "Strict RTP learning after remote
>> address set" should reset the rtp_source_learn.start timestamp, and yet the
>> "Strict RTP learning complete" messages are less than 5000ms after that.
>> What could be happening?
>>
>> Thanks again.
>>
>>
>> On Tue, 18 Apr 2023 at 10:40, Joshua C. Colp <jcolp at sangoma.com> wrote:
>>
>>> It's probably best if you read the logic[1]. There's an entire comment
>>> that talks about how it works.
>>>
>>> [1]
>>> https://github.com/asterisk/asterisk/blob/20/res/res_rtp_asterisk.c#L8158
>>>
>>> On Mon, Apr 17, 2023 at 7:10 PM David Cunningham <
>>> dcunningham at voisonics.com> wrote:
>>>
>>>> Hi Joshua,
>>>>
>>>> Could you confirm if the 5 second period for learning a new audio
>>>> stream is a minimum or a maximum? The unusual call flow in question results
>>>> in Asterisk learning a new audio stream when we don't want it to, and
>>>> having a minimum of say 2 seconds of audio would help avoid this.
>>>>
>>>> Thank you!
>>>>
>>>>
>>>> On Thu, 2 Mar 2023 at 12:32, Joshua C. Colp <jcolp at sangoma.com> wrote:
>>>>
>>>>> On Tue, Feb 28, 2023 at 9:51 AM Joshua C. Colp <jcolp at sangoma.com>
>>>>> wrote:
>>>>>
>>>>>> On Tue, Feb 28, 2023 at 9:50 AM David Cunningham <
>>>>>> dcunningham at voisonics.com> wrote:
>>>>>>
>>>>>>> Hello,
>>>>>>>
>>>>>>> Does anyone know if one of the "strictrtp" options disables RTP
>>>>>>> learning? As far as I can tell from the documentation the values "no" and
>>>>>>> "seqno" are more permissive in allowing other sources rather than less, but
>>>>>>> I thought I'd check.
>>>>>>>
>>>>>>
>>>>>> Setting it to "no" disables the learning.
>>>>>>
>>>>>
>>>>> Since I haven't gotten the email yet I'll just reply to my own.
>>>>>
>>>>> The "no" option disables strict RTP protection. Learning is part of
>>>>> strict RTP protection, it is what determines what the source of media is
>>>>> and then blocks other packets. There is no ability to set it
>>>>> per-peer/per-endpoint.
>>>>>
>>>>> --
>>>>> Joshua C. Colp
>>>>> Asterisk Project Lead
>>>>> Sangoma Technologies
>>>>> Check us out at www.sangoma.com and www.asterisk.org
>>>>> --
>>>>> _____________________________________________________________________
>>>>> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>>>>>
>>>>> Check out the new Asterisk community forum at:
>>>>> https://community.asterisk.org/
>>>>>
>>>>> New to Asterisk? Start here:
>>>>>       https://wiki.asterisk.org/wiki/display/AST/Getting+Started
>>>>>
>>>>> asterisk-users mailing list
>>>>> To UNSUBSCRIBE or update options visit:
>>>>>    http://lists.digium.com/mailman/listinfo/asterisk-users
>>>>
>>>>
>>>>
>>>> --
>>>> David Cunningham, Voisonics Limited
>>>> http://voisonics.com/
>>>> USA: +1 213 221 1092
>>>> New Zealand: +64 (0)28 2558 3782
>>>> --
>>>> _____________________________________________________________________
>>>> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>>>>
>>>> Check out the new Asterisk community forum at:
>>>> https://community.asterisk.org/
>>>>
>>>> New to Asterisk? Start here:
>>>>       https://wiki.asterisk.org/wiki/display/AST/Getting+Started
>>>>
>>>> asterisk-users mailing list
>>>> To UNSUBSCRIBE or update options visit:
>>>>    http://lists.digium.com/mailman/listinfo/asterisk-users
>>>
>>>
>>>
>>> --
>>> Joshua C. Colp
>>> Asterisk Project Lead
>>> Sangoma Technologies
>>> Check us out at www.sangoma.com and www.asterisk.org
>>> --
>>> _____________________________________________________________________
>>> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>>>
>>> Check out the new Asterisk community forum at:
>>> https://community.asterisk.org/
>>>
>>> New to Asterisk? Start here:
>>>       https://wiki.asterisk.org/wiki/display/AST/Getting+Started
>>>
>>> asterisk-users mailing list
>>> To UNSUBSCRIBE or update options visit:
>>>    http://lists.digium.com/mailman/listinfo/asterisk-users
>>
>>
>>
>> --
>> David Cunningham, Voisonics Limited
>> http://voisonics.com/
>> USA: +1 213 221 1092
>> New Zealand: +64 (0)28 2558 3782
>> --
>> _____________________________________________________________________
>> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>>
>> Check out the new Asterisk community forum at:
>> https://community.asterisk.org/
>>
>> New to Asterisk? Start here:
>>       https://wiki.asterisk.org/wiki/display/AST/Getting+Started
>>
>> asterisk-users mailing list
>> To UNSUBSCRIBE or update options visit:
>>    http://lists.digium.com/mailman/listinfo/asterisk-users
>
>
>
> --
> Joshua C. Colp
> Asterisk Project Lead
> Sangoma Technologies
> Check us out at www.sangoma.com and www.asterisk.org
> --
> _____________________________________________________________________
> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>
> Check out the new Asterisk community forum at:
> https://community.asterisk.org/
>
> New to Asterisk? Start here:
>       https://wiki.asterisk.org/wiki/display/AST/Getting+Started
>
> asterisk-users mailing list
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-users

-- 
David Cunningham, Voisonics Limited
http://voisonics.com/
USA: +1 213 221 1092
New Zealand: +64 (0)28 2558 3782
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