[asterisk-bugs] [Asterisk 0013209]: DTMF RFC2833 via SIP is not working

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
====================================================================== 
http://bugs.digium.com/view.php?id=13209 
====================================================================== 
Reported By:                ip-rob
Assigned To:                
====================================================================== 
Project:                    Asterisk
Issue ID:                   13209
Category:                   Channels/chan_sip/General
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     feedback
Asterisk Version:           1.4.21.2 
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Disclaimer on File?:        N/A 
Request Review:              
====================================================================== 
Date Submitted:             2008-07-31 08:23 CDT
Last Modified:              2008-09-02 09:49 CDT
====================================================================== 
Summary:                    DTMF RFC2833 via SIP is not working
Description: 
Using provider bandwidth.com which support RFC2833.  Configure outbound
trunk to use dtmfmode=rfc2833 and we receive double digits on a different
asterisk servers IVR.  American Express IVR does not accept any digits
(used main customer service line to test entering credit card number). 
Other IVR functions do not work.

Changing to inband works but inband should not be required by
bandwidth.com, they support rfc2833.

Configuration is using SIP devices and SIP trunks only.  A search in issue
tracker found similar problems in January of 2008 but no currently open
issues.
====================================================================== 

---------------------------------------------------------------------- 
 (0091965) ip-rob (reporter) - 2008-09-02 09:49
 http://bugs.digium.com/view.php?id=13209#c91965 
---------------------------------------------------------------------- 
We had Level3 capture the real-time traffic they were seeing on their side
to troubleshoot the issue.  They reported this capture showed both inband
and out-of-band DTMF which was contributing to the issue.  The
configuration of the SIP trunk had rfc2833 defined, not auto or inband. 
Only rfc2833 should have been sent. 

Issue History 
Date Modified    Username       Field                    Change               
====================================================================== 
2008-09-02 09:49 ip-rob         Note Added: 0091965                          
======================================================================