We are running Elastix 2.3.0 32 bit and as of about 2 months ago we started having problems with the DTMF tones. Client phones in, digital receptionist picks up and says "Good Day you have reached Snowball Effect. Press 1 for technical, 2 for sales ..." etc. No matter what button is pressed on the phone, the key pressed does not register. If you however wait till after the IVR recording is finished in most instances you are then able to press the relevant key and go to the department.
Some strange things we have encountered,
A entry level galaxy on the Vodacom network, does not work
A galaxy note on the MTN network gets through without hassles
Swap the sim cards around and the problem migrates with the service provider. Galaxy note with Vodacom doesnt work and the entry level galaxy with MTN does.
We have tested with our upstream trunk provider, as they have a DTMF tester, and it is definately registering the keys, but only with certain cell phones. The problem seems isolated to cell networks, but I cannot say for sure
Is anyone else experiencing this problem? Any ideas of how to fix it?