[asterisk-users] PJSIP trunk is down when DNS was not available during the Asterisk start.

[Leonid Fainshtein]

I deleted the res_resolver_unbound.so module, and now it works as expected.
So, the problem is related to the 'unbound' resolver?
FYI: I'm using Asterisk 16.2 installed from Debian 10 repository.

Best regards,
Leonid Fainshtein

On Thu, Aug 27, 2020 at 3:01 PM Joshua C. Colp <jcolp at sangoma.com> wrote:

> On Thu, Aug 27, 2020 at 8:58 AM Leonid Fainshtein <
> leonid.fainshtein at xorcom.com> wrote:
>
>> 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
>>
>
> What DNS resolver implementation is in use? system or unbound?
>
> Asterisk itself doesn't do any caching, we defer it to the underlying
> implementation. It could be caching a negative response.
>
> --
> Joshua C. Colp
> Asterisk Technical Lead
> Sangoma Technologies
> Check us out at www.sangoma.com and www.asterisk.org
> --
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