[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 07:11 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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 (0096758) mvanbaak (manager) - 2008-12-21 07:11
 http://bugs.digium.com/view.php?id=13900#c96758 
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Maybe I'm not going to implement it ;)

Let me explain why.
In the current code it's not that easy to grab the TTL for an A record.
And I'm not that interested to write a new resolver function in asterisk
that grabs the TTL.

Maybe it's best to use dnsmgr with refresh of a minute and use a local dns
cache that does handle the TTL.

Let me think about it for a couple of days and I'll decide wether I want
to spend the time needed or not. 

Issue History 
Date Modified    Username       Field                    Change               
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2008-12-21 07:11 mvanbaak       Note Added: 0096758                          
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