Mitel 6867i Administrator's Manual page 246

Mitel 6800 Series SIP Phone Release 4.2.0 Administrator Guide
MITEL WEB UI
1. Click on Advanced Settings->Global SIP->RTP Settings.
Global Settings:
2. Click on Advanced Settings->Line <N>->RTP Settings.
Per-Line Settings:
3. Enter an RTP Port Base in the RTP Port field. Default is 3000.
|The RTP Port indicates the port through which the RTP packets are sent. This value must
specify the beginning of the RTP port range on the gateway or router. The RTP port is used
for sending DTMF tones and for the audio stream. Your network administrator may close
some ports for security reasons. You may want to use this parameter to send RTP data
using a different port.
Note: The phones support decoding and playing out DTMF tones sent in SIP INFO
requests. The following DTMF tones are supported:
• Support signals 0-9, #, *
• Support durations up to 5 seconds
4. The "Force RFC2833 Out-of-Band DTMF" field is enabled by default. Disable this field
by unchecking the box.
Enabling this parameter forces the IP phone to use out-of-band DTMF according to
RFC2833.
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