DTMF Over VoIP

Asterisk Asterisk Support
#1

Hello

When I call my Asterisk box with 1 of the VoIP companies Asterisk doesn’t detect the DTMF correctly but if I call it from Vonage, regular phone or cell phones it works perfectly. But with my current VoIP service some PBXs detect the DTMF correctly. I’m sure that my VoIP has problems on its side, but I was wondering if there is something that I can change on my Asterisk box to try to see if it makes it work. Is there any .conf files related to DTMF?

Thanks

#2

Look for dtmfmode in sip.conf. Inband DTMF with a VoIP provider is problemic to say the least. What CODEC do you use?

#3

I use alaw and ulaw

#4

[quote=“arya6000”]Hello

When I call my Asterisk box with 1 of the VoIP companies Asterisk doesn’t detect the DTMF correctly
[/quote]

Hmm… Asterisk should not detect tones, it should see what is your VoIP company is sending to Asterisk. Just enable debug on the trunk from your VoIP company and check. Or just ask them :wink: