Dtmf, Fax And Modem Transport Modes; Dtmf/Mf Relay Settings - Nortel VoIP Gateway Configuration Manual

Appendix J

DTMF, Fax and Modem transport modes

You can configure parameters to control the transport method of:
• DTMF/MF digits.
• Fax
• Modem

DTMF/MF Relay Settings

You can control the way DTMF/MF digits are transported to the remote endpoint, using the
DTMFTransport/MFTransport configuration parameters. The following four modes are supported:
• DTMF/MFTransportType= 0 (MuteDTMF/MF).
In this mode, DTMF/MF digits are erased from the audio stream and are not relayed to the
remote side. Instead silence is sent in the RTP stream. DTMF may still be sent out of band
using H.245.
• DTMF/MFTransportType= 1 (RelayDTMF/MF).
In this mode, DTMF/MF digits are erased from the audio stream and are relayed to the remote
side using a proprietary RTP syntax.
• DTMF/MFTransportType= 2 (TransparentDTMF/MF).
In this mode, DTMF/MF digits are left in the audio stream and the DTMF/MF relay is
disabled.
• DTMF/MFTransportType= 3 (RelayDTMF/MF).
In this mode, DTMF/MF digits are erased from the audio stream and are relayed to the remote
side according to RFC 2833 standard.
• DTMF/MFTransportType= 7 (RelayDTMF/MF).
This mode is similar to the previous RFC 2833 mode, with the exception that the received
RFC 2833 digits will be muted and not played to the local gateway port.
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