bencas.blogg.se - Dtmf voip

One must also must keep in mind that the any transcoding treatment from a low-bit-rate (LBR) codec to G711 most likely distorts the tones as well. In-band audio/G711 DTMF is supported with any VoIP signaling protocol and only requires the G711 codec to be enforced for the calls end-to-end. This is because the compression algorithm utilized by high compression codecs was designed to recognize and predict human voice and not DTMF tones. The important measure to take for this method is to ensure that the calls are getting established using the G711Ulaw/Alaw codec specifically because using a codec that would compress the audio (any other codec than G711) distorts the DTMF tones and is likely render them unrecognizable to the receiving end. This means that the CUBE/IOS only passes the audio of the tones coming from one end to the other as if it is normal voice audio.

Voice In-band audio or G711 DTMF refers to the transport of audible tones over the voice audio stream, without any additional involvement of the signaling protocol or the DSP for their transmission other than to setup the call normally and pass the audio end to end using the G711Ulaw/Alaw codec. Support for In-band audio DTMF through G711

Supported DTMF-Relay Methods for CUBEĬUBE supports a broad variety of DTMF relay methods for both In-band and OOB (Out-Of-Band) for the H.323 and Session Initiation Protocol (SIP) signaling protocols. Refer to Cisco Technical Tips Conventions for information on document conventions. If your network is live, make sure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. Cisco Unified Communications Manager 7.x or later.Cisco Unified Border Element that runs on IOS.The information in this document is based on these software and hardware versions Basic knowledge of how to debug VoIP protocols like H323 and SIP.Basic knowledge of the signaling used by the SIP and H323 protocols.

Basic knowledge of how to configure and use CUBE.

Basic knowledge of how to configure and use Cisco IOS voice (such as dial-peers).

Prerequisites RequirementsĬisco recommends that you have knowledge of these topics Additionally, it also provides information and commands on how to configure, verify and troubleshoot DTMF relay for the different VoIP gateway protocols supported by CUBE.Ĭontributed by Michael Mendoza, Cisco TAC Engineer. This document describes the process to configure Dual-Tone Multi-Frequency (DTMF) relay for Cisco Unified Border Element (CUBE) Enterprise.