can trixbox still make local calls with network breaddown?

That depends on how your system is configured. If the Trixbox is running but the network is down it will work as long as you have a trunk out that doesn't rely on the network. (PRI, Analog, etc. running off of internal cards) If you have a VoIP trunk and/or network based gateways then you need the network to access them. As such they will not be available if your network is down.

Randy

I'm not sure if this has been resovled. There have been many people reporting that if the have SIP trunks in their system and the internet connection goes down SIP all goes down. The SIP phones on the network will not re-register when their registration expires. Local calls can no longer be placed becouse the phones won't register. All incoming calls go to the IVR and the extensions voice mail.

Is this the same issue you are having?

my issue is exactly same as what mvsystems explained.
I did not try the analong phone with FXS port. as normally all the IP phones will register through LAN network which is fine although the WAN is down.
However I just notice that the IP phone will not register as well and it's a bit troublesome as although I have the Interface card which is available, I also could not make any call out with the IP phone.

can anybody direct me a link referring to this problem?? I remembered someone said something refer to "Local DNS" but I am not sure what it is.

And it goes back even farther...

http://www.trixbox.org/forums/trixbox-forums/help/sip-devices-not...

Interesting.

Glad to help, Johnny. I don't see any real answer from these threads, but may be missing something. I did find that there is a patch mentioned on the digium forums. If you find a relatively easy solution, please post back here.

Yes, it is a little confused... I think at the beginning Johnny should have said "lost internet connection" instead of network failing or network down or whatever. I saw this first hand a couple of weeks ago and the bottom line is that when you add in a sip trunk into what was before a purely zap box, and you lose the internet connection... your sip trunk drops (obviously), but you lose any sip phones also... x-lite or hardphones (sip) or whatever- all sip drops registration. You cannot even call between extensions. Then when using a sip phone, you cannot dial out through the pstn because the sip phone is down (unregistered). The answer seems to be related to dns somehow. When the sip trunk comes back up as the internet connection is re-established, it is fine.

An interesting aside would be to find out if it happens on a purely voip system. I only work with pstn installs and have a couple with sip trunks (backup) that both have this problem. When I switch the trunks to IAX, they are fine during an outage. If you hard code the ip into the sip trunk registration, it is also fine during an outage. At least this is what I have found.

Anyway, I will let Johnny confirm my assumption of what his problem is.

Crees when you disconnected the internet connection you could still make calls but did you leave it disconnected for any length of time? What we experienced at a site was when the internet was down and the system had SIP trunks and copper trunks you could still use the copper trunks while the IP phones were still registered. When the phones registration period expires they would not re-register with the server and you could no longer use the copper lines until the internet connection was restored.

Hi Crees,

Thanks for your account of the situation. You have applied one of the workarounds mentioned in a thread I posted earlier... hosts file pointing to sip IP or just setting IP in the reg string. This will work but must be monitored for an IP change. If you take that out you should see the problem with all sip losing registration. 10 minutes would be plenty of time to wait as the connections are lost in less than a minute.

hi, w5waf, for your information, my asterisk server has one TDM400P card connecting to 2 PSTN lines, and it also has several IAX2 and SIP trunks for international IDD calls.
my original question is once the network goes down, not only the IAX2 and sip trunk can not be made, but also the PSTN calls cannot be used as all the sip phone cannot register to the server any more with "sip log on failed".

any simple idea from you?

hi, crees, sorry for any misunderstanding.
The "network goes down" means the ISP network goes down instead of the local LAN.
And I have my own Asterisk server with several IP Phones registered to it. my very original question is : once the Broadband internet goes down, the internal IP phone cannot register to my server which is located in the same LAN as well.

Hope this makes you clear, and i think so far the only possile solution is to build a local DNS.

hi, pca, i have found Alex's solution to it as below, as a share:
1) yum -y install webmin
2) Login to webmin, select Servers -> Bind.
3) You will be prompted to click the link to install the Bind server. Do so.
4) Proceed to the Servers -> Bind screen.
5) Under Forwarding and Transfers, setup your ISP's DNS servers.
6) Save your options.
7) Proceed to Networking -> Network Configuration -> Hostname and DNS Client.
8) Setup the DNS servers in order, with the IP of the Trixbox server being the first server, and the IP(s) of your ISP's servers being secondary (and tertiary).
9) Save your options.
10) Proceed to System -> Bootup and Shutdown.
11) Ensure that NAMED is started, and set to start at boot.
12) Reboot your Trixbox server and do some testing.

I will test it out tomorrow, however, i am curious that if my ISP provier or some of my SIP trunk host ip address are dynamic, will this way work? if I change all the sip trunk and sip devices to IAX2, will it resolve this problem??

johnny

I think it all depends on how you set up your local network. I have adsl modem connected to a 4 ports router and when I turned off the ISP modem cutting out the internet, all my local extensions still work and my PSTN connected thru spa3104 still work as always. Never have to bind or tweak any thing. As long as my trixbox server and the router is on, things keep rolling except registrations with sip providers which obviously will not work because there is no internet.

hi, techman, could you post your network configuration here so that I can test?
like /etc/hosts, /etc/resolv.conf /etc/named.conf
/etc/sysconfig/network, /etc/sysconfig/network-scripts/ifcfg-eth0 ??
and do you have a local DNS avaialble ?

I have tested a few and so far i can confirm that with IAX extension there is no problem with registration when network down even using sip trunk.

If keeping using SIP extension, I have tested to modify /etc/hosts with the server local IP here, and /etc/resolv.conf with router ip here.

johnny

The webmin BIND method didn't work for me. If I deplug the internet cable from my router, all the sip trunks and extensions still didn't work. The only solution that worked for me is the physical changed of the tribox dns. Unless there is another way around it, I think the physical method works great except the disadvantages of using ip instead of FQDN.
FOR THOSE THAT THE WEBMIN BIND PROCESS work for, did you guys did something different other than the steps posted by johnny? If any please post..

I mean assigning trixbox IP address as the (trixbox) dns address. When I put the trixbox dns and isp dns in the resolve.conf solved all my problems. Now, I do not have to use ip address only. I can now use fqdn or ip address without a problem in the trunk settings. It worked like a charm. Turned-off router and pstn and extensions worked.......................................................

Just setting up BIND doesn't help any more than bringing the sip channels down 10 minutes later. The only solution so far is to avoid using fqdn names for the sip trunk registration.
I wonder if putting the fqdn of the sip proxy in the /etc/hosts file could be of help too.