[asterisk-bugs] [JIRA] (ASTERISK-23767) [patch] Dynamic IAX2 registration stops trying if ever not able to resolve

[Michael L. Young (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-23767?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael L. Young updated ASTERISK-23767:
----------------------------------------

    Reviewboard Link: https://reviewboard.asterisk.org/r/3856/

> [patch] Dynamic IAX2 registration stops trying if ever not able to resolve
> --------------------------------------------------------------------------
>
>                 Key: ASTERISK-23767
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-23767
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_iax2
>    Affects Versions: 11.9.0
>         Environment: IAX2 registration to dynamic hostname
>            Reporter: David Herselman
>            Assignee: Michael L. Young
>         Attachments: asterisk-23767-dns_reg_retry_and_set_port_11_v1.diff, asterisk-23767-dns_reg_retry_and_set_port_11_v2.diff
>
>
> Upgraded Asterisk from 10.7.1 to 11.9.0 on 55 hosts and are now experiencing an issue relating to IAX2 registrations, when the remote host is utilising a dynamic hostname.
> Alpha and Omega register with each other using IAX2 trunks. Both sides are set as 'host=dynamic' and rely on registrations to ascertain the remote point's IP address. This has been extremely reliable prior to our upgrade to 11.9.0.
>  
>  
> Problem: If DNS resolution is ever unavailable (Telco here kicks ADSL sessions off after 24 hours so that they reconnect) the registration gets set with a '(null)' host address and never retries the registration. Issuing a 'iax2 reload' doesn't help either, only completely unloading and reloading the chan_iax2 module works.
>  
> Alpha has the following iax registration:
> {noformat}
> register=Alpha:*******@sip.crffac.golden-era.co.za{noformat}
>  
>  
> Alpha shows the host for the registration as being '(null)' although DNS resolution is currently operational (interruption was 6+ hours ago):
> {noformat}
> alpha*CLI> iax2 show registry
> Host                  dnsmgr  Username    Perceived             Refresh  State
> (null)                N       Alpha       <Unregistered>             60  Unregistered
> 1 IAX2 registrations.
> alpha*CLI> iax2 show peers
> Name/Username    Host                 Mask             Port          Status      Description
> Omega/Alpha      165.145.109.36  (D)  255.255.255.255  4569 (T)      OK (27 ms)
> 1 iax2 peers [1 online, 0 offline, 0 unmonitored]
> {noformat}
> Omega correctly shows the Alpha peer as being unavailable, as it hasn't registered:
> {noformat}
> omega*CLI> iax2 show registry
> Host                  dnsmgr  Username    Perceived             Refresh  State
> 196.15.196.130:4569   N       Omega       165.145.109.36:4569        60  Registered
> 1 IAX2 registrations.
> omega*CLI> iax2 show peers
> Name/Username    Host                 Mask             Port          Status      Description
> Alpha/Omega      (null)          (D)  255.255.255.255  0    (T)      UNKNOWN
> 1 iax2 peers [0 online, 1 offline, 0 unmonitored]
> {noformat}
>  
>  
> Issuing a 'reload iax2' does absolutely nothing, only completely unloading the chan_iax2 module and reloading it restores operation:
> {noformat}
> alpha*CLI> module unload chan_iax2.so
> Unloaded chan_iax2.so
> alpha*CLI> module load chan_iax2.so
> Loaded chan_iax2.so
> alpha*CLI> iax2 show registry
> Host                  dnsmgr  Username    Perceived             Refresh  State
> 165.145.109.36:4569   N       Alpha       196.15.196.130:4569        60  Registered
> 1 IAX2 registrations.
> omega*CLI> iax2 show peers
> Name/Username    Host                 Mask             Port          Status      Description
> Alpha/Omega      196.15.196.130  (D)  255.255.255.255  4569 (T)      OK (27 ms)
> 1 iax2 peers [1 online, 0 offline, 0 unmonitored]
> {noformat}



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