[asterisk-dev] Asterisk / pjsip: Bug or feature? TCP/TLS connection is endless after unregistering the last trunk to the destination

[Joshua C. Colp]

On Sun, Jan 10, 2021 at 4:32 PM Joshua C. Colp <jcolp at digium.com> wrote:

> On Sun, Jan 10, 2021 at 4:14 PM Joshua C. Colp <jcolp at digium.com> wrote:
>
>>
>>>
>>> >> Register multiple numbers to one destination (Asterisk 18.0.1)
>>> >> --------------------------------------------------------------
>>> >> If you register more than one number to the same destination, asterisk
>>> >> handles all registers through the same connection. This doesn't work
>>> (well)
>>> >> with all ISPs. Deutsche Telekom /
>>> >> AllIP e.g. supports it partly - means, you can register more than one
>>> >> number - but if you deregister one of it, the complete connection is
>>> >> dropped (because normally, they want to
>>> >> have for each register an own connection). Besides that, there are
>>> >> problems during reRegistration, if they are reRegistered all at the
>>> same
>>> >> time (if they are reRegistered serially,
>>> >> it's working - maybe Asterisk can't properly handle mutliple
>>> Registers to
>>> >> the same destination via same connection).
>>> >>
>>> >
>>> > Connection reuse itself is a low level PJSIP thing.
>>>
>>> Is it possible to disable it?
>>>
>>
>> The last time I checked the PJSIP documentation there wasn't, but they
>> could have added something.
>>
>
> Aha, I remembered at the PJSIP level a feature[1] got added when the
> Google Voice patch was done. It hasn't been exposed to be explicitly
> configurable in Asterisk though.
>
> [1]
> https://www.pjsip.org/pjsip/docs/html/structpjsip__tpselector.htm#a1622f416d48eb173aed22b750aa28dfa
>

In fact the flow functionality[1] may get you closer to how you need
things. There was a bug though with it, so either 18 branch needs to be
used or this change[2] included.

[1]
https://github.com/asterisk/asterisk/blob/master/configs/samples/pjsip.conf.sample#L161
[2] https://gerrit.asterisk.org/c/asterisk/+/15256

-- 
Joshua C. Colp
Asterisk Technical Lead
Sangoma Technologies
Check us out at www.sangoma.com and www.asterisk.org
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