H3C Technologies H3C MSR 5600 - Manual (Page 65)

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Configuring DTMF for a POTS entity
There are two ways to transmit DTMF tones: in-band signaling and out-of-band signaling.
In-band signaling sends DTMF tones in RTP packets, and out-of-band signaling sends DTMF tones in SIP
messages, or RFC 2883-compliant RTP messages (NTE mode).
To use NTE mode, configure the outband nte command and the same payload type value on the
originating and terminating sides. Otherwise, DTMF tones might fail to be transmitted. For more
information about out-of-band DTMF, see "Configuring SIP."
To configure DTMF for a POTS entity:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter voice view. voice-setup N/A
3. Enter dial program view. dial-program N/A
4. Create a POTS entity and
enter POTS entity view.
entity entity-number pots N/A
5. Configure out-of-band DTMF
transmission.
• (Method 1) Configure NTE
mode:
{
Enable NTE mode:
outband nte
{
Configure the value of the
payload type used by NTE:
rtp payload-type nte value
• (Method 2) Configure SIP
mode:
outband sip
Use either method.
By default, in-band transmission is
adopted, and the value of the
payload type used by NTE is 101.
When the device is connected to a
device from another vendor, you
cannot set the payload type field to
any value forbidden by that
device. Otherwise, an NTE
negotiation failure might occur.
Enabling VAD for a POTS entity
The voice activity detection (VAD) discriminates between silence and speech on a voice connection
according to their energies. With VAD, a POTS entity does not generate traffic during periods of silence.
To enable VAD for a POTS entity:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter voice view. voice-setup N/A
3. Enter dial program view. dial-program N/A
4. Create a POTS entity and
enter POTS entity view.
entity entity-number pots N/A
5. Enable VAD.
vad-on [ g723r53 | g723r63 |
g729a | g729r8 ] *
By default, VAD is disabled.
The G.711 and G.726 codecs do
not support VAD. The G.729br8
codec always supports VAD.