[Freeswitch-users] DNS resolving for REGISTER requests

Mon Jun 24 12:19:46 UTC 2019

if the DNS entries haven’t yet expired then freeswitch won’t query again.
The provider should set lower expiration on their records before a change
or wait the full expiration after making a change to
actually move hosts or they will cause this issue.  This has always been
how the DNS system works.

On Mon, Jun 24, 2019 at 8:14 AM Sebastian Denz <denzs at gonicus.de> wrote:

> That is already the case..
>
> When FS starts up it does an SRV-Lookup which contains several adresses.
>
> One thing is.. the old endpoint is still working..
>
> The provider just changes the IP behind the A record of the first SRV
> result.
>
> But the main problem is that FS does not use DNS at all before sending a
> REGISTER... So i doubt this can be workarounded without touching the
> code of FS or (and that is what i am going to do) use an external script
> to detect the change and then trigger a gateway restart in FS...
>
> Am 6/24/19 um 1:30 PM schrieb Giovanni Maruzzelli:
> > Maybe, just maybe, putting all addresses in srv records, FS will read
> that
> > at startup, then try them all if first fail? No idea if works... Just
> > curious...
> >
> >
> >
> > On Mon, Jun 24, 2019, 12:18 Sebastian Denz <denzs at gonicus.de> wrote:
> >
> >> I already thought about something like that..
> >>
> >> But the main reason for the problem seems to be, that FreeSWITCH does
> >> not query the dns (remote or local) at all before sending the
> >> REGISTER... :-/
> >>
> >> I could workaround the current issue easily by using static addresses
> >> but then i would loose the failover capability and i would have to check
> >> for changes manually or by script... normally dns would just solve that
> >> by itself :)
> >>
> >> I think i could put Kamailio in front of FreeSWITCH and let it handle
> >> the dns resolution, but that feels like using a sledgehammer to crack a
> >> nut ;)
> >>
> >> And i would prefer a tiny approach, ideally with FreeSWITCH behaving
> >> correctly...?!
> >>
> >> Am 6/24/19 um 12:24 PM schrieb Giovanni Maruzzelli:
> >>> obviously, you can locally provide dns with dnsmasq or such, easily
> >>> configured, for other domains too.
> >>>
> >>> Maybe you can put all SRV addresses, with different weights, in your
> own
> >>> (eg, locally defined) zone definition for deutsche telekom, and
> >> freeswitch
> >>> will try them all.
> >>>
> >>> Not sure this will work, but maybe yes :)
> >>>
> >>>
> >>>
> >>> On Mon, Jun 24, 2019 at 12:19 PM Sebastian Denz <denzs at gonicus.de>
> >> wrote:
> >>>
> >>>> Thank you for giving me that pointer!
> >>>>
> >>>> I thought i would have searched for everything regarding that topic,
> >>>> but obviously i missed that post!
> >>>>
> >>>>
> >>>>
> >>
> https://lists.freeswitch.org/pipermail/freeswitch-users/2018-January/128837.html
> >>>>
> >>>> I'll contact Kai directly as i was not able to found a corresponding
> >>>> issue in the tracker...
> >>>>
> >>>> But if anyone has another idea regarding the problem, i would of
> course
> >>>> appreciate any hints too! ;)
> >>>>
> >>>> Sebastian
> >>>>
> >>>> Am 6/24/19 um 11:21 AM schrieb Giovanni Maruzzelli:
> >>>>> I believe this question  was already asked in the past in this
> mailing
> >>>>> list, and IIRC the answer was no.
> >>>>>
> >>>>> You may wanto to check on the mailing list archives (in signature),
> >>>> because
> >>>>> maybe my merory is wrong.
> >>>>>
> >>>>> -giovanni
> >>>>>
> >>>>>
> >>>>> On Mon, Jun 24, 2019 at 11:14 AM Sebastian Denz <denzs at gonicus.de>
> >>>> wrote:
> >>>>>
> >>>>>> Hello,
> >>>>>>
> >>>>>> i am using FreeSWITCH as SBC to our SIP provider (Deutsche Telekom
> in
> >>>>>> germany).
> >>>>>>
> >>>>>> This works quite well, but ~ once in a month we are unable to do
> >>>>>> outbound calls.
> >>>>>>
> >>>>>> It turned out, that the provider changes some IPs from time to
> time..
> >>>>>>
> >>>>>> That leads to FreeSWITCH being registered to the old IP while
> >>>>>> INVITE-requests of new dialogs are sent to the new address. The
> >> provider
> >>>>>> terminates this with 403 - forbidden.
> >>>>>>
> >>>>>> The registration happens every 5 minutes, but FreeSWITCH does not
> >> update
> >>>>>> the dns cache for the target IP address. So i gets stuck in that
> >>>>>> situation being registered on the old IP while sending INVITEs to
> the
> >>>>>> new one..
> >>>>>>
> >>>>>> The only solution to that is reloading the profile or restarting
> >>>>>> FreeSWITCH...
> >>>>>>
> >>>>>> Is there an option to make FreeSWITCH asking the dns _before every_
> >>>>>> REGISTER? Or do you have any other suggestion on how to fix this?
> >>>>>>
> >>>>>> Best regards,
> >>>>>> Sebastian Denz
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>
> >>
> _________________________________________________________________________
> >>>>>>
> >>>>>> The FreeSWITCH project is sponsored by SignalWire
> >>>> https://signalwire.com
> >>>>>> Enhance your FreeSWITCH install with disruptive priced SMS and PSTN
> >>>>>> services.
> >>>>>> Build your next product on our scalable cloud platform.
> >>>>>>
> >>>>>> Join our online community to chat in real time
> >>>>>> https://signalwire.community
> >>>>>>
> >>>>>> Professional FreeSWITCH Services
> >>>>>> sales at freeswitch.com
> >>>>>> https://freeswitch.com
> >>>>>>
> >>>>>> Official FreeSWITCH Sites
> >>>>>> https://freeswitch.com/oss
> >>>>>> https://freeswitch.org/confluence
> >>>>>> https://cluecon.com
> >>>>>>
> >>>>>> FreeSWITCH-users mailing list
> >>>>>> FreeSWITCH-users at lists.freeswitch.org
> >>>>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> >>>>>> UNSUBSCRIBE:
> >>>> http://lists.freeswitch.org/mailman/options/freeswitch-users
> >>>>>> https://freeswitch.com
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>
> _________________________________________________________________________
> >>>>>
> >>>>> The FreeSWITCH project is sponsored by SignalWire
> >> https://signalwire.com
> >>>>> Enhance your FreeSWITCH install with disruptive priced SMS and PSTN
> >>>> services.
> >>>>> Build your next product on our scalable cloud platform.
> >>>>>
> >>>>> Join our online community to chat in real time
> >>>> https://signalwire.community
> >>>>>
> >>>>> Professional FreeSWITCH Services
> >>>>> sales at freeswitch.com
> >>>>> https://freeswitch.com
> >>>>>
> >>>>> Official FreeSWITCH Sites
> >>>>> https://freeswitch.com/oss
> >>>>> https://freeswitch.org/confluence
> >>>>> https://cluecon.com
> >>>>>
> >>>>> FreeSWITCH-users mailing list
> >>>>> FreeSWITCH-users at lists.freeswitch.org
> >>>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> >>>>> UNSUBSCRIBE:
> >> http://lists.freeswitch.org/mailman/options/freeswitch-users
> >>>>> https://freeswitch.com
> >>>>>
> >>>>
> >>>>
> >>>>
> >>
> _________________________________________________________________________
> >>>>
> >>>> The FreeSWITCH project is sponsored by SignalWire
> >> https://signalwire.com
> >>>> Enhance your FreeSWITCH install with disruptive priced SMS and PSTN
> >>>> services.
> >>>> Build your next product on our scalable cloud platform.
> >>>>
> >>>> Join our online community to chat in real time
> >>>> https://signalwire.community
> >>>>
> >>>> Professional FreeSWITCH Services
> >>>> sales at freeswitch.com
> >>>> https://freeswitch.com
> >>>>
> >>>> Official FreeSWITCH Sites
> >>>> https://freeswitch.com/oss
> >>>> https://freeswitch.org/confluence
> >>>> https://cluecon.com
> >>>>
> >>>> FreeSWITCH-users mailing list
> >>>> FreeSWITCH-users at lists.freeswitch.org
> >>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> >>>> UNSUBSCRIBE:
> >> http://lists.freeswitch.org/mailman/options/freeswitch-users
> >>>> https://freeswitch.com
> >>>
> >>>
> >>>
> >>>
> >>>
> _________________________________________________________________________
> >>>
> >>> The FreeSWITCH project is sponsored by SignalWire
> https://signalwire.com
> >>> Enhance your FreeSWITCH install with disruptive priced SMS and PSTN
> >> services.
> >>> Build your next product on our scalable cloud platform.
> >>>
> >>> Join our online community to chat in real time
> >> https://signalwire.community
> >>>
> >>> Professional FreeSWITCH Services
> >>> sales at freeswitch.com
> >>> https://freeswitch.com
> >>>
> >>> Official FreeSWITCH Sites
> >>> https://freeswitch.com/oss
> >>> https://freeswitch.org/confluence
> >>> https://cluecon.com
> >>>
> >>> FreeSWITCH-users mailing list
> >>> FreeSWITCH-users at lists.freeswitch.org
> >>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> >>> UNSUBSCRIBE:
> http://lists.freeswitch.org/mailman/options/freeswitch-users
> >>> https://freeswitch.com
> >>>
> >>
> >>
> >>
> _________________________________________________________________________
> >>
> >> The FreeSWITCH project is sponsored by SignalWire
> https://signalwire.com
> >> Enhance your FreeSWITCH install with disruptive priced SMS and PSTN
> >> services.
> >> Build your next product on our scalable cloud platform.
> >>
> >> Join our online community to chat in real time
> >> https://signalwire.community
> >>
> >> Professional FreeSWITCH Services
> >> sales at freeswitch.com
> >> https://freeswitch.com
> >>
> >> Official FreeSWITCH Sites
> >> https://freeswitch.com/oss
> >> https://freeswitch.org/confluence
> >> https://cluecon.com
> >>
> >> FreeSWITCH-users mailing list
> >> FreeSWITCH-users at lists.freeswitch.org
> >> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> >> UNSUBSCRIBE:
> http://lists.freeswitch.org/mailman/options/freeswitch-users
> >> https://freeswitch.com
> >
> >
> > _________________________________________________________________________
> >
> > The FreeSWITCH project is sponsored by SignalWire https://signalwire.com
> > Enhance your FreeSWITCH install with disruptive priced SMS and PSTN
> services.
> > Build your next product on our scalable cloud platform.
> >
> > Join our online community to chat in real time
> https://signalwire.community
> >
> > Professional FreeSWITCH Services
> > sales at freeswitch.com
> > https://freeswitch.com
> >
> > Official FreeSWITCH Sites
> > https://freeswitch.com/oss
> > https://freeswitch.org/confluence
> > https://cluecon.com
> >
> > FreeSWITCH-users mailing list
> > FreeSWITCH-users at lists.freeswitch.org
> > http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> > UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
> > https://freeswitch.com
> >
>
>
> _________________________________________________________________________
>
> The FreeSWITCH project is sponsored by SignalWire https://signalwire.com
> Enhance your FreeSWITCH install with disruptive priced SMS and PSTN
> services.
> Build your next product on our scalable cloud platform.
>
> Join our online community to chat in real time
> https://signalwire.community
>
> Professional FreeSWITCH Services
> sales at freeswitch.com
> https://freeswitch.com
>
> Official FreeSWITCH Sites
> https://freeswitch.com/oss
> https://freeswitch.org/confluence
> https://cluecon.com
>
> FreeSWITCH-users mailing list
> FreeSWITCH-users at lists.freeswitch.org
> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
> https://freeswitch.com
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