19.2.1.3.2. Gateways 
Only DMC endpoints are aware of the DMC and able to reduce bandwidth
on the Master connection accordingly.
If the gateway is not a DMC endpoint e.g. in multihop scenarios, then
the gateway is NOT aware of the DMC. In order to reduce bandwidth
usage the gateways should be configured with a codec supporting VAD and
additionally VAD must be activated (VAD will then lead to the gateway
generating CN packets).
IMPORTANT:
HG 3530 is never a DMC endpoint.
These are recommended ASC settings in AMO CGWB:
Table 88. Recommended ASC settings in AMO CGWB
|
PRIO1:
|
CODEC = G711A
|
VAD = YES
|
RTP-SIZE = 30
|
|
PRIO2:
|
CODEC = G729AB
|
VAD = YES
|
RTP-SIZE = 20
|
|
PRIO3:
|
CODEC = G723
|
VAD = YES
|
RTP-SIZE = 30
|
|
PRIO4:
|
CODEC = NONE
|
VAD = NO
|
RTP-SIZE = 20
|
|
PRIO5:
|
CODEC = NONE
|
VAD = NO
|
RTP-SIZE = 20
|
|
PRIO6:
|
CODEC = NONE
|
VAD = NO
|
RTP-SIZE = 20
|
|
PRIO7:
|
CODEC = G729A
|
VAD = NO
|
RTP-SIZE = 20**
|
** This setting should be removed if bandwidth reduction is always
wanted. However in this case silent suppression (VAD) must be
activated in the phone as described under Section 2.3.3,
“Voice Activity Detection (VAD)”, because there’s
need of:
- G729AB: VAD=YES in AMO CGWB if we check silent suppression checkbox in phones
or
- G729A: VAD=NO in AMO CGWB if we don’t check silent suppression checkbox in phones
INFO:
If set only G729AB VAD=YES in AMO CGWB and silent suppression checkbox
in phones is not checked, then every call attempt fails and HY2
code (no Bearer Capabilities) will be displayed.