Configuring Dtmf Transmission - HP FlexNetwork MSR Series Configuration Manual

Step
7. Enable the local POTS voice
entity to play ringback tones.

Configuring DTMF transmission

In conversation, DTMF digits can be transmitted transparently between originating and terminating
gateways in inband or out-of-band mode:
•
Inband transmission—DTMF dialing tones are transmitted to the peer end as normal voice
packets.
•
Out-of-band transmission—Corresponding information is extracted from DTMF digits and is
then encapsulated in H.245, H.225, SIP, or RTP packets (RFC 2883) for transmission. The
transmission of DTMF digits in RTP packets is also called as NTE mode.
Configuration guidelines
When you configure DTMF transmission, follow these guidelines:
•
Both H.323 and SIP support NTE.
•
Because the implementations of different vendors can differ, Hewlett Packard Enterprise
recommends that you configure command outband nte and the same payload type value on
both the originating and terminating sides. Otherwise, NTE negotiation might fail and thus the
user cannot receive DTMF tones.
•
It is forbidden to set the NTE payload type field to 98, which has already been used to identify
nonstandard T.38 fax packets.
•
When the device is connected with other manufacturers' routers for communication, you cannot
set the payload type field to any forbidden by these routers. Otherwise, an NTE negotiation
failure might occur.
Configuration procedure
To configure out-of-band DTMF transmission:
Step
1. Enter system view.
2. Enter voice view.
3. Enter voice dial program
view.
4. Create a POTS voice entity
and enter POTS voice entity
view.
5. Configure out-of-band DTMF
transmission.
6. Configure the value of the
payload type used by NTE.
Command
send-ring
Command
system-view
voice-setup
dial-program
entity entity-number pots
outband { h225 | h245 | nte |
sip }
rtp payload-type nte value
12
Remarks
Optional.
By default, the local POTS voice
entity does not play ringback
tones.
This command is only applicable
for POTS entities bound to a
non-FXS or non-FXO voice
subscriber lines.
Remarks
N/A
N/A
N/A
N/A
Optional.
By default, inband transmission is
adopted.
Optional.
The default is 101.