![]() Packet loss can create havoc with VoIP connections and in relation DTMF tones. But, before making any changes with settings make sure that the issues that you are experiencing are not related to packet loss. Troubleshooting DTMF issues are hit and miss and may be as simple as using a different DTMF setting and retrying. Troubleshooting DTMF problems with your VoIP connection. This small amount of in-band tone along with the RFC2833 tone sent are both received by the far end voice mail system which will then register an error (problem), possibly an invalid mailbox or invalid password. At times the switch can't always completely remove the in-band DTMF tone which is a problem, because by the time it has detected the DTMF tone, it has already passed a short amount of it. The switch has to detect and remove the tone sent by the ATA from the audio stream because the upstream provider specified RFC2833 DTMF. This upstream carrier then terminates the call to the PSTN, possibly to a voice mail system, which will require regeneration of the audible inband DTMF tones. ![]() ![]() In some VoIP routes a switch may be configured to detect in-band DTMF which is sent by the VoIP ATA, but then switches to an out of band RFC2833 DTMF required for an upstream provider. What are the problems with DTMF and VoIP?
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