User`s guide

VoiceFinder AP2120 VoIP Gateway User’s Guide Version 1.00
AddPac Technology Co., Ltd. -
264 -
5.7.4.5. dtmf-relay
To specify how an H.323 gateway relays dual tone multi-frequency (DTMF)
tones between telephony interfaces and an IP network, use the dtmf-relay
command in dial-peer configuration mode. Use the no form of this command
to remove all signaling options and to send the DTMF tones as part of the audio
stream.
dtmf relay { h245-alphanumeric }
no dtmf relay
5.7.4.5.1. Syntax
Keyword / Argument Description
h245-alphanumeric (Optional) Forwards DTMF tones by using the H.245
"alphanumeric" User Input Indication method.
Supports tones 0-9, *, #, and A-D.
5.7.4.5.2. Default Value
None
5.7.4.5.3. Command Mode
Dial-Peer Configuration Mode
5.7.4.5.4. Usage Guideline
DTMF is the tone generated when you press a digit on a touch-tone phone. This
tone is compressed at one end of a call; when the tone is decompressed at
the other end, it can become distorted, depending on the codec used. The
DTMF relay feature transports DTMF tones generated after call establishment
out of band using a standard H.323 out-of-band method.
The dtmf-relay command determines the outgoing format of relayed DTMF
tones. The gateway automatically accepts all formats.
The principal advantage of the dtmf-relay command is that it sends DTMF