[asterisk-users] Migrating asterisk 11 to 13: some callers get no ringback tone any more

Joshua Colp jcolp at digium.com
Tue May 3 13:52:05 CDT 2016

Whoops, email client auto-filled dev previously. Let's try this again.

Michael Maier wrote:


 > Ok - but this doesn't seem to answer my main question:
 > Why must
 > progressinband=never
 > be applied especially if asterisk uses it by default? The big difference
 > between w/ and w/o it is:

The default in 13 is "no" which still allows early media through. That
option has a complicated past.

 > w/o the option progrssinband=never just the sip-package
 > 	183 Session Progress
 > is sent.

Yes, because it's doing inband progress using a media stream.

 > w/ the option set, the additional sip-packages
 > 	100 Trying
 > 	180 Ringing
 > 	180 Ringing
 > are sent.
 > If progrssinband=never is the default, the Ringing package should be
 > sent always, shouldn't it?

It's not the default.

 > If I remove the option progrssinband=never via FreePBX, I can't find any
 > other value provided to progrssinband in /etc/asterisk/*.
 > Why does it work always correctly w/ the second trunk, which is
 > connected directly to the extension?

FreePBX may not use inband progress for that scenario, causing it to
send out of band ringing instead.

 > Is it possible to switch off the standard behavior of asterisk /
 > progrssinband for ring groups only by setting some other options?

Asterisk does not have the concept of ring groups, this is a FreePBX
construct. Asterisk itself does allow the option to be set on an
individual basis for the entries in sip.conf.

Joshua Colp
Digium, Inc. | Senior Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - US
Check us out at: www.digium.com & www.asterisk.org

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