DTMF tones to DISA

I’m running Asterisk 1.4 with a TDM400 card (Zapata drivers) and whenever I call my PSTN line from my cell phone, the tones are only recognized about maybe 5% of the time if I’m lucky. The rest of the time, the system would just hang up on me.

I tried Asterisk 1.6 (Dahdi drivers) and ran into the same issue.

I tried changing the Rx gain for the PSTN channels, but still no go. I have read a lot about this issue, but nothing has worked for me.

have you tried with relaxdtmf=yes? maybe it will help you…

btw - DTMF sent using the mobile phone are sent out-of-band to your mobile provider and from there are sent in-band (inside the audio channel) to the PSTN network. Have you tried with another PSTN provider?


I do have relaxdtmf enabled. As far as pstn provider, it’s a monopoly here in Egypt, so I don’t have a choice. It’s just crazy that sometimes it works, but most of the time it doesn’t. Thanks for the suggestions.