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Summary:ASTERISK-11334: Default (sample setting) of channel group selection will cause glare on analog circuits
Reporter:Jim Van Meggelen (jimvanm)Labels:
Date Opened:2008-01-29 19:49:14.000-0600Date Closed:2008-02-04 08:35:02.000-0600
Priority:TrivialRegression?No
Status:Closed/CompleteComponents:Documentation
Versions:Frequency of
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Description:In the extensions.conf file, the example relating to channel groups should not show 'g2'. but rather 'G2'.

Having outgoing channels select in the same order as incoming channels will greatly increase the chances of glare occurring. Instead, selecting highest-numbered channels in the pool for outgoing (the carrier usually starts with lowest-number for incoming) will virtually eliminate the chances of glare, except on very busy sites.

Let's say we have 8 analog lines. The default example suggests selecting channels like this (g):

incoming-->1<-- outgoing
          2
          3
          4
          5
          6
          7
          8

To reduce the chance of glare, best practice (the default in any traditional PBX) is to select highest-numbered lines for outgoing calls. Like this (G):

incoming-->1
          2
          3
          4
          5
          6
          7
          8<-- outgoing

Not a big change, but it'll make a big difference to folks using analog lines, who wouldn't tend to think about glare.
Comments:By: Digium Subversion (svnbot) 2008-01-30 09:32:40.000-0600

Repository: asterisk
Revision: 101220

_U  trunk/
U   trunk/configs/extensions.conf.sample

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r101220 | qwell | 2008-01-30 09:32:37 -0600 (Wed, 30 Jan 2008) | 14 lines

Merged revisions 101219 via svnmerge from
https://origsvn.digium.com/svn/asterisk/branches/1.4

(closes issue ASTERISK-11334)
........
r101219 | qwell | 2008-01-30 09:34:37 -0600 (Wed, 30 Jan 2008) | 5 lines

Change default config to use descending channel order of groups, rather than ascending.
Fixes a potential source of confusion in glare-type situations.

Issue 11875, reported by JimVanM.

........

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http://svn.digium.com/view/asterisk?view=rev&revision=101220
By: Jim Van Meggelen (jimvanm) 2008-02-03 08:57:10.000-0600

Might want to fix this in extensions.ael as well ;-)

Regards,

Jim

By: Digium Subversion (svnbot) 2008-02-04 08:35:02.000-0600

Repository: asterisk
Revision: 102262

U   trunk/configs/extensions.ael.sample
U   trunk/configs/extensions.lua.sample

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r102262 | qwell | 2008-02-04 08:35:00 -0600 (Mon, 04 Feb 2008) | 4 lines

Change examples to use G here also.

Closes issue ASTERISK-11334

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http://svn.digium.com/view/asterisk?view=rev&revision=102262