Asterisk does not recognise DTMF tones from mobile phones

Posted by Eugene van der Merwe on Server Fault See other posts from Server Fault or by Eugene van der Merwe
Published on 2012-07-06T07:44:25Z Indexed on 2012/07/06 9:17 UTC
Read the original article Hit count: 296

Filed under:

asterisk

We have an Asterisk 1.8.7.0 (the Elastix derivative) switchboard.

Every since a month ago, seemingly out of the blue, the switchboard does not recognise DTMF tones any more from mobile phones.

Testing the switchboard using 7777 works.
Testing the switchboard from a normal phones works.
Testing the switchboard from a mobile phone fails.

Looking at the log file I can't see anything. I used 'asterisk -rvvvv' and 'tail -f /var/log/asterisk/full' to see the live output and scan the logs. I guess I don't see anything because it's simply not recognising the DTMF tones.

I did brief research and found an old setting for SIP phones, 'rfc2833compensate=yes', and tried adding this to 'sip_general_custom.conf'. After that I did 'core restart when convenient' but that didn't make any difference.

Could anyone give me some additional troubleshooting steps?

Related posts about asterisk

How to send REGISTER request periodically from my SIP client to Asterisk server using Asterisk Manag

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I am using Asterisk 1.4 server and I have created a desktop client using the Asterisk.NET Library. I am able to log into the AMI (as a manager) using Asterisk.Net, but I cannot find a way to send the REGISTER command using the AMI, to share my client's location information with the server. I… >>> More
asterisk : Unable to connect to remote asterisk (does /var/run/asterisk.ctl exist?)

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi all, I am learning asterisk. After I have installed asterisk I have tried to connect with it using asterisk -rvvvvc. But it gave me an following error message. Unable to connect to remote asterisk (does /var/run/asterisk.ctl exist?) How can I solve this issue.Please help me. Thanks in advance. >>> More
Ubuntu: package installed, but files missing?

as seen on Server Fault - Search for 'Server Fault'
I have been playing around with the /etc/asterisk directory, installing the related pacakge (asterisk-config), removing it, removing the directory manually (just playing around to get the configuration synced to my configuration repo). Now I just want to reinstall the official package, so I do: root@tethys:/etc#… >>> More
Can we manage incoming call number landing on asterisk?

as seen on Server Fault - Search for 'Server Fault'
I am using Asterisk 1.4.2 in two different machine. I have configured some extensions in asterisk. When any caller, dial my extension number with local number then if I see asterisk console (asterisk -r) then incoming number is starting with 0, but if caller dial same extension number using STD number… >>> More
Asterisk SIP digest authentication username mismatch

as seen on Super User - Search for 'Super User'
I have an asterisk system that I'm attempting to get to work as a backup for our 3com system. We already use it for a conference bridge. Our phones are the 3com 3C10402B, so I don't have the issue of older 3com phones that come without a SIP image. The 3com phones are communicating SIP with the… >>> More

Developer IT