17 thoughts on - Local Calls Not Possible When Internet Connection Down

• There is insufficient information to be able to answer this. Such as, what actually happens when attempts are made? What shows on the console?

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• Hi Marek !
  pls show logs 🙂

  I think it’s a problem with DNS server availability

  Lukasz

• Are the REGISTER requests reaching Asterisk (do they show up in a packet capture, do they show up in “pjsip set logger on”)? It needs to be further isolated. How are the phones configured to reach Asterisk? If using a hostname, are they still able to resolve it?

• Łukasz Grzywański writes:

  I have tried to and mostly succeeded at making things work when the WAN
  is down. Elements needed:

  run a local named, vs configuring resolver to your ISP

  for names needed in the LAN, ensure they are answered locally without
  needing any non-local DNS records. For me this is “foo.local” being
  in a policy zone to provide the LAN address of the host, as the WAN
  address goes away and changes

  Consider if you want to just put LAN IP addresses in your config

  actually turn off the WAN and test

  when that works, pull the cable to the ONT from the router, or
  equivalent, to simulate failure vs just deconniguring it and test
  again

  —

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• Could you show the phone configurations – section “Proxy and Registration”

• Marek Greško writes:

  You should run tcpdump on 53 and 5353 in multiple places and figure out what it is doing, rather than asking us, who can only guess.

  —

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• Hello,

  well I do not ask those who only guess, but those who know what is asterisk expected to do when internet connectivity goes down. I did not had a chance to make internet not to work yet, since it is needed. But inspecting dns logs I found out that there started to be resolving for _sip._tcp and _sip._udp records for the provider’s server. So apparently making hosts record make asterisk happy when everything works, but when there is a communication problem then it falls back to searching for srv records. At least it seems to be so for now. Moreover I found out this old thread:

  https://community.freepbx.org/t/asterisk-become-mad-when-a-dns-problem-occur/4755/10

  So the problem seems to be still present. So if asterisk is not able to resolve using it’s dns resolver it breaks also local communication which is complete non-sense.

  I am thinking of two possible workarounds:

  1. If thre is a possibility to convince asterisk not to fallback to searching for srv records, it would be ideal. Is somebody aware of such options in pjsip?

  2. If the first workaround is not feasible I can create rpz records for provider’s A and SRV records.

  When I will be able to shutdown internet or at least outbound DNS, I will try to make sure my findings are correct using tcpdump.

  Thanks

  Marek

  Sent with Proton Mail secure email.

  ——- Original Message ——-
  —

• The expectation is that Asterisk continues to work. That being said there is one case (specifically using realtime with an identify section that references a hostname) that can cause this specific behavior where PJSIP
  will block.

  Are you in that scenario? If so you CAN disable SRV records on the identify by setting “srv_lookups” to “no”.

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• Marek,

  See if calls hang in the system if you encounter another outage core show channels

  …if so, core set verbose 3
  and see what instructions subsequent calls hang on.

  —

• Hello,

  it did not seem the call hung. It seemed it never started. There was no dialplan execution on the asterisk side. It looked like phones were unregistered. Same shows the log posted previously.

  Marek

  Sent with Proton Mail secure email.

  ——- Original Message ——-
  —

• Are the phones and the server in the same subnet? You might making note of the IPs and just simply try pinging everything with the uplink disconnected. Also, if you are using domain names for registration, it is possible a dns server must be reachable.

  If you are using database for any of your call processing, an unreachable dns server can also be the cause of trouble. For some reason, even if you are using IP addressing, Mysql will try to resolve a connection and can hang (there is a mysql parameter to not resolve addresses).

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