[asterisk-bugs] [JIRA] (ASTERISK-26883) pjsip DNS SRV: missing auto generated match entry if DNS temporarily fails on startup

[Rusty Newton (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-26883?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rusty Newton updated ASTERISK-26883:
------------------------------------

    Component/s: Resources/res_pjsip_endpoint_identifier_ip

> pjsip DNS SRV: missing auto generated match entry if DNS temporarily fails on startup
> -------------------------------------------------------------------------------------
>
>                 Key: ASTERISK-26883
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-26883
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Resources/res_pjsip_endpoint_identifier_ip
>    Affects Versions: 13.14.0
>         Environment: CentOS 6, 64bit
>            Reporter: Michael Maier
>            Assignee: Rusty Newton
>
> If on startup of asterisk DNS temporarily fails, no match entry is generated, resulting in silently dropped inbound calls later on, because pjsip retries e.g. every 60s and establishes a working connection to ISP as soon DNS is working again.
> As I detected this problem about 3 hours after starting of asterisk, I'm assuming that changes of DNS lookups later on aren't recognized, too, resulting again in silently dropped inbound calls.
> Therefore, the requirement is to always be synchronous with the IP addresses used by pjsip.
> Make a local DNS server to not respond (e.g. with iptables) and start asterisk:
> {noformat}
> [2017-03-18 07:53:58] ERROR[1967] netsock2.c: getaddrinfo("tel.t-online.de", "(null)", ...): Temporary failure in name resolution
> [2017-03-18 07:53:58] ERROR[1967] res_pjsip_endpoint_identifier_ip.c: An error occurred when adding resolution results of 'tel.t-online.de' on 'telekomPJSIP'
> [2017-03-18 07:53:58] ERROR[1967] res_sorcery_config.c: Could not create an object of type 'identify' with id 'telekomPJSIP' from configuration file 'pjsip.conf'
> [2017-03-18 07:54:00] WARNING[2155] res_pjsip_outbound_registration.c: No response received from 'sip:tel.t-online.de' on registration attempt to 'sip:+4911111111111 at tel.t-online.de', retrying in '60'
> [2017-03-18 07:54:08] ERROR[2155] res_pjsip.c: Error 320052 'DNS "Server failure" (PJLIB_UTIL_EDNS_SERVFAIL)' sending OPTIONS request to endpoint telekomPJSIP
> {noformat}
> About 2 or 3 minutes later, re enable the resolver again by removing the iptable rules and pjsip will register to the ISP successfully. But the auto generated match entries will stay empty.
> I'm using bundled pjsip (see http://lists.digium.com/pipermail/asterisk-dev/2017-March/076202.html and http://lists.digium.com/pipermail/asterisk-dev/2017-March/076215.html)



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