Configuring Dtmf Relay; Configuring Rtp Payload Types; Dtmf Relay - Patton electronics SmartNode Series Software Configuration Manual

SmartWare Software Configuration Guide
Configuring DTMF relay
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
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).
This procedure describes how to configure DTMF relay
Mode: Profile VoIP
Step Command
1 node(pf-voip)[pf-name]#dtmf-relay
{default|rtp|signaling}
Configuring RTP payload types
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
Step
1 node(pf-voip)[name]#rtp payload-
type nte payload-type
VoIP profile configuration task list

dtmf relay

Signalling of dtmf tones
encoder
Detects dtmf tones
Figure 2. DTMF Relay
Command
47 • VoIP profile configuration
command solves the problem of DTMF distortion by
payload
decoder
Generates dtmf tones
Purpose
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.
figure 2. H.323
Purpose
574