[asterisk-bugs] [JIRA] (ASTERISK-26280) DNS lookups can block channel media paths

[Mark Michelson (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-26280?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mark Michelson closed ASTERISK-26280.
-------------------------------------


> DNS lookups can block channel media paths
> -----------------------------------------
>
>                 Key: ASTERISK-26280
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-26280
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Resources/res_rtp_asterisk
>    Affects Versions: 13.10.0
>            Reporter: Mark Michelson
>
> When an RTCP packet is sent or received, res_rtp_asterisk generates a Stasis event that contains the RTCP report as well as the local and remote addresses that the report pertains to.
> The addresses are determined using {{ast_find_ourip()}}. For the local address, this will typically result in a lookup of the hostname of the server, and then a DNS lookup of that hostname. If you do not have the host in {{/etc/hosts}}, then this results in a full DNS lookup, which can potentially block for some time.
> This is especially problematic when performing RTCP reads, since those are done on the same thread responsible for reading and writing media.
> A workaround exists. The lookup can be avoided if in {{pjsip.conf}} the endpoint has {{bind_rtp_to_media_address=yes}} and has set an explicit {{media_address}}.



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