Patton electronic SmartNode 4110 Series ユーザーズマニュアル

VoIP profile configuration task list

SmartWare Software Configuration Guide 

Dual tone multi-frequency (DTMF) tones are usually transported accurately in band when using high bit-rate 
voice codecs such as G.711. Low bit-rate codecs such as G.729 and G.723.1 are highly optimized for voice pat-
terns and tend to distort DTMF tones. The 

 command solves the problem of DTMF distortion by 

transporting DTMF tones out-of-band or separate from the encoded voice stream as shown in 

signals the DTMF tones as H.245 user input indications, SIP uses a mechanism of RTP to reliably transport 
tones (according to RFC2833).

Figure 2. DTMF Relay

This procedure describes how to configure DTMF relay

Mode: Profile VoIP

If you are using DTMF relay with SIP, the DTMF digits are transported in RTP packets with a special payload 
type. The default value for this payload type can be configured in the profile VoIP.

Procedure: Configure RTP NTE payload type

Mode: Profile VoIP

Define how DTMF digits shall be transmitted. 
You can configure the SIP gateway to send 
DTMF digits either by using the SIP INFO 
method or in the RTP stream (RFC 2833). The 
gateway will always receive both types of 
DTMF digits. The command has currently no 
effect for H.323 calls.

Specifies the RTP payload-type for named tone 
events NTE (RFC2833). Default: 101.

encoder

decoder

payload

         Signalling of dtmf tones

Generates dtmf tones

Detects dtmf tones