Internet Telephony Gateway User's Manual

VIP User’s Manual
Command Line Interface
50
on
Enable adaptive playback.
off
Disable adaptive playback.
set coding
profile_id
dtmf_relay {on | off}
VIP supports DTMF Relay, in which DTMF tones are detected during voice processing, encoded into
SIP-UserInformation packets and conveyed to the remote VIP via the SIP call control band. This com-
mand is used to enable or disable the DTMF Relay feature.
Syntax description
on
Detect DTMF tones while voice session is on-going, and send detected
DTMF digits to remote gateway via the SIP call control band.
off
Do not detect DTMF tones. DTMF tones are compressed and send to
remote gateway the same as regular voice frame.
set coding
profile_id
max_delay
Voice packets from network may have traversed variable path and each packets have experienced dif-
ferent propagation delay. To ease this phenomenon, VIP has a built-in voice packet buffer, which
stores voice packets received from the network. The effect of non-uniform delay among packets is
known as jitter. The voice buffer allows VIP to remove the packet jitter from the incoming packet
stream before decompressing and sending the packet to telephony port for playing out. This command
is used to set the size of voice buffer.
Syntax description
delay
Value in milliseconds.
Notes
1.
The maximum delay should be at least 2 packet times greater than the nominal delay. Refer to
command
“
set coding profile_id nom_delay
”
for details about setting nominal delay.
2. The maximum delay for each coder is shown in the following table:
Coding Type Maximum Delay
G.711
μ
-law
145 ms
G.723 500 ms
G.729AB 500 ms
set coding
profile_id
min_delay
This command is used to set the time each voice packet is stored in the voice packet buffer before VIP
playing out the packet. It is only meaningful when the adaptive playback feature is disabled. Refer to
“set coding profile_id adaptive_playout” for details about adaptive playback feature.
Syntax description
delay
Value in milliseconds.