R2511-HP MSR Router Series Voice Configuration Guide(V5)

12
Step Command Remarks
7. Enable the local POTS voice
entity to play ringback tones.
send-ring
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.
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, HP 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 Command Remarks
1. Enter system view.
system-view N/A
2. Enter voice view.
voice-setup N/A
3. Enter voice dial program view.
dial-program N/A
4. Create a POTS voice entity
and enter POTS voice entity
view.
entity entity-number pots N/A
5. Configure out-of-band DTMF
transmission.
outband { h225 | h245 | nte |
sip }
Optional.
By default, inband transmission is
adopted.