Leonid Fainshtein
2020-Aug-27 10:47 UTC
[asterisk-users] PJSIP trunk is down when DNS was not available during the Asterisk start.
Hi, I have Asterisk 16.x with a trunk configured with a hostname in PJSIP AOR. The registration is not required for this trunk. I paid attention that Asterisk performs DNS resolving of the hostname that is configured in the AOR 'contact' parameter only upon the Asterisk start only. Thus, if Asterisk is started when the DNS server is unreachable due to the Internet connection failure then the 'contact' will be not resolvable forever even when the Internet connection is returned. As a result of that, the 'qualify' procedure is not performed and the trunk status is 'Unavail'. The only way to revive the trunk is to restart Asterisk. Even 'pjsip reload' doesn't solve the problem. Is it the 'by design' Asterisk behavior or I have missed something? Thank you. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.digium.com/pipermail/asterisk-users/attachments/20200827/ab44f44a/attachment.html>
Joshua C. Colp
2020-Aug-27 10:52 UTC
[asterisk-users] PJSIP trunk is down when DNS was not available during the Asterisk start.
On Thu, Aug 27, 2020 at 7:48 AM Leonid Fainshtein < leonid.fainshtein at xorcom.com> wrote:> Hi, > I have Asterisk 16.x with a trunk configured with a hostname in PJSIP AOR. > The registration is not required for this trunk. > I paid attention that Asterisk performs DNS resolving of the hostname that > is configured in the AOR 'contact' parameter only upon the Asterisk start > only. > Thus, if Asterisk is started when the DNS server is unreachable due to the > Internet connection failure then the 'contact' will be not resolvable > forever even when the Internet connection is returned. As a result of that, > the 'qualify' procedure is not performed and the trunk status is 'Unavail'. > The only way to revive the trunk is to restart Asterisk. Even 'pjsip > reload' doesn't solve the problem. > Is it the 'by design' Asterisk behavior or I have missed something? >PJSIP in Asterisk uses asynchronous DNS, so it should resolve at the time the request is actually made and should work afterwards. Not doing so would be a bug, and collecting a debug level log (debug to a file in logger.conf with core set debug 9) would explicitly show what is going on for DNS. -- Joshua C. Colp Asterisk Technical Lead Sangoma Technologies Check us out at www.sangoma.com and www.asterisk.org -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.digium.com/pipermail/asterisk-users/attachments/20200827/ee69f4ba/attachment.html>
Leonid Fainshtein
2020-Aug-27 11:57 UTC
[asterisk-users] PJSIP trunk is down when DNS was not available during the Asterisk start.
I see that pjsip_resolver.c tries unsuccessfuly to resolve the hostname each 10 seconds: [Aug 27 07:51:36] DEBUG[595] res_pjsip.c: 0x7f75282eb150: Wrapper created [Aug 27 07:51:36] DEBUG[595] res_pjsip.c: 0x7f75282eb150: Set timer to 2000 msec [Aug 27 07:51:36] DEBUG[595] res_pjsip/pjsip_resolver.c: Performing SIP DNS resolution of target 'rpi6.in.xorcom.com' [Aug 27 07:51:36] DEBUG[595] res_pjsip/pjsip_resolver.c: Transport type for target 'rpi6.in.xorcom.com' is 'Unspecified' [Aug 27 07:51:36] DEBUG[595] res_pjsip/pjsip_resolver.c: [0x7f75282fe7f8] Created resolution tracking for target 'rpi6.in.xorcom.com' [Aug 27 07:51:36] DEBUG[595] res_pjsip/pjsip_resolver.c: [0x7f75282fe7f8] Added target 'rpi6.in.xorcom.com' with record type '35', transport 'Unspecified', and port '0' [Aug 27 07:51:36] DEBUG[595] res_pjsip/pjsip_resolver.c: [0x7f75282fe7f8] Added target '_sips._tcp.rpi6.in.xorcom.com' with record type '33', transport 'TLS', and port '5061' [Aug 27 07:51:36] DEBUG[595] res_pjsip/pjsip_resolver.c: [0x7f75282fe7f8] Added target '_sip._tcp.rpi6.in.xorcom.com' with record type '33', transport 'TCP', and port '5060' [Aug 27 07:51:36] DEBUG[595] res_pjsip/pjsip_resolver.c: [0x7f75282fe7f8] Added target '_sip._udp.rpi6.in.xorcom.com' with record type '33', transport 'UDP', and port '5060' [Aug 27 07:51:36] DEBUG[595] res_pjsip/pjsip_resolver.c: [0x7f75282fe7f8] Added target 'rpi6.in.xorcom.com' with record type '1', transport 'UDP', and port '5060' [Aug 27 07:51:36] DEBUG[595] res_pjsip/pjsip_resolver.c: [0x7f75282fe7f8] Starting initial resolution using parallel queries for target ' rpi6.in.xorcom.com' [Aug 27 07:51:36] DEBUG[605] res_pjsip/pjsip_resolver.c: [0x7f75282fe7f8] All parallel queries completed [Aug 27 07:51:36] DEBUG[605] res_pjsip/pjsip_resolver.c: [0x7f75282fe7f8] Resolution completed - 0 viable targets [Aug 27 07:51:36] DEBUG[595] res_pjsip/pjsip_resolver.c: [0x7f75282fe7f8] Invoking user callback with '0' addresses [Aug 27 07:51:36] DEBUG[595] res_pjsip.c: 0x7f75282eb150: PJSIP tsx response received [Aug 27 07:51:36] DEBUG[595] res_pjsip.c: 0x7f75282eb150: Cancelling timer [Aug 27 07:51:36] DEBUG[595] res_pjsip.c: 0x7f75282eb150: Timer cancelled [Aug 27 07:51:36] DEBUG[595] res_pjsip.c: 0x7f75282eb150: Callbacks executed [Aug 27 07:51:36] DEBUG[595] res_pjsip.c: 0x7f75282eb150: wrapper destroyed [Aug 27 07:51:36] DEBUG[595] res_pjsip/pjsip_options.c: Contact g145/sip: rpi6.in.xorcom.com status didn't change: Unreachable, RTT: 0.000 msec [Aug 27 07:51:36] DEBUG[595] res_pjsip/pjsip_options.c: AOR 'g145' now has 0 available contacts But a DNS server is available at this time: # host rpi6.in.xorcom.com rpi6.in.xorcom.com has address 192.168.0.175 # ping rpi6.in.xorcom.com PING rpi6.in.xorcom.com (192.168.0.175) 56(84) bytes of data. 64 bytes from rpi6.in.xorcom.com (192.168.0.175): icmp_seq=1 ttl=64 time=0.990 ms Thank you, Leonid Fainshtein On Thu, Aug 27, 2020 at 1:52 PM Joshua C. Colp <jcolp at sangoma.com> wrote:> On Thu, Aug 27, 2020 at 7:48 AM Leonid Fainshtein < > leonid.fainshtein at xorcom.com> wrote: > >> Hi, >> I have Asterisk 16.x with a trunk configured with a hostname in PJSIP AOR. >> The registration is not required for this trunk. >> I paid attention that Asterisk performs DNS resolving of the hostname >> that is configured in the AOR 'contact' parameter only upon the Asterisk >> start only. >> Thus, if Asterisk is started when the DNS server is unreachable due to >> the Internet connection failure then the 'contact' will be not resolvable >> forever even when the Internet connection is returned. As a result of that, >> the 'qualify' procedure is not performed and the trunk status is 'Unavail'. >> The only way to revive the trunk is to restart Asterisk. Even 'pjsip >> reload' doesn't solve the problem. >> Is it the 'by design' Asterisk behavior or I have missed something? >> > > PJSIP in Asterisk uses asynchronous DNS, so it should resolve at the time > the request is actually made and should work afterwards. Not doing so would > be a bug, and collecting a debug level log (debug to a file in logger.conf > with core set debug 9) would explicitly show what is going on for DNS. > > -- > Joshua C. Colp > Asterisk Technical Lead > Sangoma Technologies > Check us out at www.sangoma.com and www.asterisk.org > -- > _____________________________________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > > Check out the new Asterisk community forum at: > https://community.asterisk.org/ > > New to Asterisk? Start here: > https://wiki.asterisk.org/wiki/display/AST/Getting+Started > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.digium.com/pipermail/asterisk-users/attachments/20200827/878d4160/attachment.html>
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