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xallan
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Posts: 2
Joined: Fri Jul 02, 2021 1:06 pm

VoIP call interruptions and invalid records in DNS cache after upgrading to long-term version 6.47.9 or 6.47.10.

Fri Jul 02, 2021 3:16 pm

Hi!

After upgrading from long-term version 6.46.8 to 6.47.9 or 6.47.10 VoIP calls started to hang up after 1-2 minutes.

In DNS cache are invalid, negative records of proxy servers, type unknown, data 0.0.0.0, like:
proxy1a.elio”œļŌ
proxy1a.elio”œļt
proxy1a.elio”œÓt
proxy1b.elio”œÓt

the correct entries are:

proxy1a.elion.ee A 217.159.187.4
proxy1b.elion.ee A 217.159.187.132

After downgrading to version 6.46.8 all works as expected, all entries in DNS cache are OK.

Which could be a problem? Router is RB4011iGS+, VoIP device Cisco IP phone 303, Cisco is directly connected to router, no other devices.
SIP helper is disabled, Fast path is allowed, neighbor discovery is enabled.

Thanks in advance
 
pe1chl
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Posts: 10195
Joined: Mon Jun 08, 2015 12:09 pm

Re: VoIP call interruptions and invalid records in DNS cache after upgrading to long-term version 6.47.9 or 6.47.10.

Fri Jul 02, 2021 4:25 pm

When you have DNS cache problems, make sure you turn off DoH.
 
xallan
just joined
Topic Author
Posts: 2
Joined: Fri Jul 02, 2021 1:06 pm

Re: VoIP call interruptions and invalid records in DNS cache after upgrading to long-term version 6.47.9 or 6.47.10.

Mon Jul 05, 2021 10:08 am

Hi!

DoH is off:

servers: aaa.bbb.ccc.ddd,eee.fff.ggg.hhh
dynamic-servers:
use-doh-server:
verify-doh-cert: no
allow-remote-requests: yes
max-udp-packet-size: 4096
query-server-timeout: 2s
query-total-timeout: 10s
max-concurrent-queries: 1000
max-concurrent-tcp-sessions: 20
cache-size: 4096KiB
cache-max-ttl: 1w
cache-used: 37KiB

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