[Freeswitch-users] Update DNS SRV records

Tue Jun 25 06:36:04 UTC 2019

Basically I solved the problem by working around it with a hangup hook. In
it I check the call disposition and if it is 403 I restart the gateway and
then retry the call. Not the most perfect solution, but does the job and I
do not have to manually restart any gateways. We had cases where the IP
change for the server happened several times daily, which was very annoying.

BR

Kai

Am Mo., 24. Juni 2019 um 16:51 Uhr schrieb Sebastian Denz <denzs at gonicus.de
>:

> I didnt see your post before, so i opened a topic for propably the same
> issue today... i am preparing a test setup right now to reproduce it
> with the current git-HEAD and then i'll open an issue in Jira...
>
> Best regards,
> Sebastian
>
> Am 6/18/19 um 9:05 AM schrieb Paul Muaddib:
> > Hi,
> >
> > slowly it becomes annoying. Since a few days I need to reload the gateway
> > profile twice a day to refresh the SRV records. I found out that my SIP
> > Provider "Deutsche Telekom" updated their Documentation of their SIP
> Trunk.
> >
> > Perhaps interesting for others. Here is the updated PDF
> >
> https://geschaeftskunden.telekom.de/blobCache/umn/uti/457678_1548405575000/blobBinary/SIP-Trunk-Technische-Unterlage.ps
> >
> > The document also includes a section on DNS and SRV. Can someone tell me
> if
> > I can make changes in the configuration based on the following
> information
> > so that the SRV records are updated correctly?
> >
> > Best regards,
> >
> > ############
> >
> > Domain and IP address recognition and resolution on the SIP trunk
> interface
> > is performed via DNS servers.
> >
> > In the registration mode, the IP address, transport and port of the
> server
> > are determined according to RFC 3263 and SIPConnect 2.0 16.1 "Locating
> SIP
> > Servers".
> >
> > According to RFC 3263, the SIP-PBX performs a NAPTR query for the domain
> > names:
> > - reg.sip-trunk.telekom.de.
> > - stat.sip-trunk.telekom.de
> >
> > and receives the records with the protocols supported by the domain name
> > (in case of a SIP trunk usage of the TLS via TCP and TCP protocol
> depending
> > on whether the client uses TLS or not).
> >
> > Since the protocol has been determined, an IP address and port must also
> be
> > determined, as described in RFC 3263, Chapter 5, and an SRV query is sent
> > to the record returned by the NAPTR. Finally, the client performs an
> > A-Record lookup on these records to obtain the IP addresses of the
> servers.
> > The destination node selection is the SIP-PBX behavior (SIPconnect 2.0,
> > Chapter 17.1 for Register Mode and Chapter 16.1 for Static Mode).
> >
> > A lookup to these domain names is not possible. Therefore a lookup with
> > some tools (e.g. nslookup under some Windows versions) does not lead to
> > success, because these only make an A-Record query by default!
> > The correct query order is therefore
> > - NAPTR on reg.sip-trunk.telekom.de
> > - SRV to a record of the NAPTR response
> > - A to a record of the SRV response
> >
> > Success also leads:
> > - SRV on reg.sip-trunk.telekom.de
> >
> > - A to a record of the SRV response
> >
> > Does not lead to success:
> > - A on reg.sip-trunk.telekom.de
> >
> > Attention: With many PBXs, setting the port (e.g. to 5060) leads to a
> > behavior in which only the A record is queried, which then fails. A
> > NAPTR/SRV query is only performed if the port is set to "0". (The
> > background is that the SRV query provides the port, i.e. the port cannot
> be
> > set to a fixed value in advance).
> >
> > ############
> >
> >
> >
> > Am Di., 7. Mai 2019 um 13:42 Uhr schrieb Paul Muaddib <
> > paul.muaddib83 at gmail.com>:
> >
> >> How can I check the TTL of the SRV register?
> >>
> >> Am Di., 7. Mai 2019 um 12:36 Uhr schrieb Raúl Alexis Betancor Santana <
> >> rbetancor at gmail.com>:
> >>
> >>> The only way you have is to tell FS to "reload" that provider gw
> profile.
> >>>
> >>> You should check the TTL of that provider SRV registers as may be a
> >>> problem on their end, not updating them correctly.
> >>>
> >>> On Tue, May 7, 2019 at 10:25 AM Paul Muaddib <paul.muaddib83 at gmail.com
> >
> >>> wrote:
> >>>
> >>>> Hi Lawrence,
> >>>>
> >>>> I think that you want to know how to tell your fS to re-lookup the SRV
> >>>>> records for that gateway's domain while running, as the SRV records
> in that
> >>>>> provider's DNS changes regularly.
> >>>>>
> >>>>> I can't help on the details of fS's DNS lookup code, but is that the
> >>>>> actual problem you have and so the question you want to ask?
> >>>>>
> >>>>
> >>>> Yes, that is my problem.
> >>>>
> >>>> Am Di., 7. Mai 2019 um 00:07 Uhr schrieb Lawrence Conroy <
> >>>> lconroy at insensate.co.uk>:
> >>>>
> >>>>> Hi
> >>>>>  They may do; they may not. It's hard to tell when the question is
> that
> >>>>> confusing.
> >>>>>
> >>>>> 1. IIUC, fS doesn't update local DNS records at all.
> >>>>> (it could, but you'd need to write something external to do the DNS
> >>>>> update).
> >>>>>
> >>>>> 2. you talk of not being able to call OUT.
> >>>>> That's good, as it means there is no need to update your domain's DNS
> >>>>> records.
> >>>>>
> >>>>> I assume that what you mean is that your provider changes its SRV
> >>>>> records every couple of days.
> >>>>> You have a gateway entry in your fS config for that provider.
> >>>>> That gateway spec has a defined domain name for the server.
> >>>>> I think that you want to know how to tell your fS to re-lookup the
> SRV
> >>>>> records for that gateway's domain while running, as the SRV records
> in that
> >>>>> provider's DNS changes regularly.
> >>>>>
> >>>>> I can't help on the details of fS's DNS lookup code, but is that the
> >>>>> actual problem you have and so the question you want to ask?
> >>>>>
> >>>>> br,
> >>>>>   Lawrence
> >>>>>
> >>>>>
> >>>>> On 6 May 2019, at 21:04, Paul Muaddib <paul.muaddib83 at gmail.com>
> wrote:
> >>>>>
> >>>>>> Really nobody with the same problem?
> >>>>>>
> >>>>>> Am Do., 2. Mai 2019 um 11:23 Uhr schrieb Paul Muaddib <
> >>>>> paul.muaddib83 at gmail.com>:
> >>>>>> Hi,
> >>>>>>
> >>>>>> how can I tell freeswitch to update the SRV records or is there a
> way
> >>>>> to force the update without restarting. My provider keeps changing
> the
> >>>>> entries after a few days and if I don't restart freeswitch I can not
> call
> >>>>> out anymore (403)
> >>>>>>
> >>>>>> Best regards
> >>>>>>
> >>>>>
> _________________________________________________________________________
> >>>>>>
> >>>>>> 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
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> >>>>>>
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> >>>>>> https://freeswitch.com
> >>>>>>
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> >>>>>>
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> >>>>>
> >>>>>
> >>>>>
> >>>>>
> _________________________________________________________________________
> >>>>>
> >>>>> 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
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> >>>>
> >>>>
> _________________________________________________________________________
> >>>>
> >>>> 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
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> 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
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> 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
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