[asterisk-bugs] [Asterisk 0013900]: [feature request] Asterisk does not respect DNS TTL in iax.conf

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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http://bugs.digium.com/view.php?id=13900 
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Reported By:                ffadaie
Assigned To:                mvanbaak
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Project:                    Asterisk
Issue ID:                   13900
Category:                   Channels/chan_iax2
Reproducibility:            always
Severity:                   feature
Priority:                   normal
Status:                     assigned
Asterisk Version:           1.4.22 
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Disclaimer on File?:        N/A 
Request Review:              
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Date Submitted:             2008-11-13 23:07 CST
Last Modified:              2008-12-21 08:34 CST
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Summary:                    [feature request] Asterisk does not respect DNS TTL
in iax.conf
Description: 
This is probably not specific to IAX but I just tried it for IAX so I am
not sure about the other channels.
The problem is :
when you Dial and IAX channel either by direct dialing
Dial(IAX2/@some_host_name/extension) or by referring to a section in
iax.conf Dial(IAX2/@[section]/extension) and the host names are not IP
addresses but DNS names, Asterisk does not care if the resolved address
changes.
In other words, lets say you have a dynamic DNS that translates to IP_1
and you use this in your configuration in Asterisk. If this IP changes
Asterisk would not respect it and keeps using the old IP until you reload.
It seems that Asterisk resolves the DNS and stores the IP in the memory
(as oppose to having the DNS entry and resolving it each time)
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 (0096760) ffadaie (reporter) - 2008-12-21 08:34
 http://bugs.digium.com/view.php?id=13900#c96760 
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This has caused us a lot of problem when we receive our service from the
providers who are using Asterisk but does not have the required knowledge
to implement a workaround.
We use dynamic DNS for our incoming calls. The TTL for our DNS is 30 sec
(and we really cannot increase it). In our side, we have implemented the
workarounds and it was just us, I wouldn't insist on this issue as much as
I have so far ;) but some of our providers(the ones who use Asterisk), keep
sending the messages to just one of our servers (to which the DNS is
resolved at first). 
This problem does not exists in Cisco IOS, Avaya, ... 

Issue History 
Date Modified    Username       Field                    Change               
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2008-12-21 08:34 ffadaie        Note Added: 0096760                          
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