3Com VCX V7000, Installation Manual

Page: 384 / 488

382 A
PPENDIX
B: A
UTOMATED
B
RANCH
O
FFICE
I
NSTALLATION
The following notes apply:
■
The coder name is case-sensitive.
■
If silence suppression is not defined (for a specific coder), the value
defined by the parameter EnableSilenceCompression is used.
■
The value of several fields is hard-coded according to well-known
standards (for example, the payload type of G.711 µ-law is always 0).
Other values can be set dynamically. If no value is specified for a
dynamic field, a default value is assigned. If a value is specified for a
hard-coded field, the value is ignored.
■
Only the ptime of the first coder in the defined coder list is declared in
INVITE / 200 OK SDP, even if multiple coders are defined.
■
If the coder G.729 is selected and silence suppression is disabled (for
this coder), the gateway includes the string 'annexb=no' in the SDP of
the relevant SIP messages. If silence suppression is enabled or set to
'Enable w/o Adaptations', 'annexb=yes' is included. An exception to
this logic is when the remote gateway is a Cisco device
(IsCiscoSCEMode).
■
Both GSM-FR and MS-GSM coders use Payload Type = 3. Using SDP, it
isn't possible to differentiate between the two. Therefore, it is highly
recommended not to select both coders simultaneously.
For each codec, enter one of these packetization times:
■
G.711 — 10, 20, 30, 40, 50, 60, 80, 100, 120 (default=20)
■
G.723 — 30, 60, 90, 120, 150 (default = 30)
■
G.726 — 10, 20, 40, 60, 80, 100, 120 (default=20)
■
G.729 — 10, 20, 30, 40, 50, 60, 80, 100, 120 (default=20)
PSTNPREFIX = [201-202]#,2,*,*,0
PSTNPREFIX = *,1,*,*,0
TRUNKGROUP_1 = 1-4,101,0
TRUNKGROUP_2 = 1-2,201,0
NetCoder
[NetCoder]
0 20 (default), 40, 60, 80,
100, 120 6.4 [0]
7.2 [1]
8.0 [2]
8.8 [3]
(default) 51
52
53
54 Disable [0]
Enable [1]
Transparent
[Transparent]
All 20 (default), 40, 60, 80,
100, 120 Always 64 Dynamic
(0-120) Disable [0]
Enable [1]
Table 18 Coders (continued)