Mitel 6863i Administrator's Manual page 224

Mitel 6800i Series SIP Phone Release 4.0.0 SP2 Administrator Guide
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You can specify a customized codec preference list on a global-basis using the configuration
files or the Mitel Web UI.
OUT-OF-BAND DTMF AND DTMF METHOD
The IP phones support out-of-band Dual-Tone Multifrequency (DTMF) mode as referenced in
RFC2833. In the Mitel Web UI, you can enable or disable this feature as required. The
"out-of-band DTMF" is enabled by default. In out-of-band mode, the DTMF audio is
automatically clamped (muted) and DTMF digits are not sent in the RTP packets. You can
configure out-of-band DTMF on a global-basis using the configuration files or the Mitel Web UI.
An additional feature on the IP phone allows you to select the DTMF method that the phone
uses to send DTMF digits from the IP phone via INFO messages. You can set the DTMF method
as Real-Time Transport Protocol (RTP), SIP INFO, or both. You can configure the DTMF method
on a global or per-line basis using the configuration files or the Mitel Web UI.
The matrix below details DTMF behavior when the out-of-band DTMF and DTMF method
settings are configured in various scenarios:
WEB UI SETTING/CONFIGURATION
PARAMETER SETTING
DTMF
METHOD/
SIP DTMF
METHOD
RTP (0)
RTP (0)
SIP INFO (1)
4-79
106
107
113
110
111
112
98
97
115
96
9
8
118
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DTMF BEHAVIOR
FORCE RFC2833 SIP INFO
OUT-OF-BAND DTMF/
SIP OUT-OF-BAND
DTMF
Disabled (0) No
Enabled (1) No
Disabled (0) Yes
BV16/8000
BV32/16000
BV32/16000
G711u/16000
G711a/16000
L16/8000
G726-16/8000
G726-24/8000
G726-32/8000
G726-40/8000
G722/8000
G711a/8000
AMR (G.722.2) (Licensed
feature)
AMR-WB (G.722.2) (Licensed
feature)
IN-BAND DTMF OUT-OF-BAND
DTMF (RFC2833)
Yes No
No Yes
No No