Version 5.2 97 September 2007
SIP User's Manual 5. Web-based Management
6. From the 'Silence Suppression' drop-down list, enable or disable the silence
suppression option for the coder you selected.
7. Repeat steps 2 through 6 for the second to fifth coders (optional).
8. Click the Submit button to save your changes.
9. To save the changes to flash memory, refer to 'Saving Configuration' on page 256.
Notes:
• Each coder (i.e., 'Coder Name') can appear only once.
• If packetization time and / or rate are not specified, the default value is
applied.
• The ptime specifies the packetization time the gateway expects to
receive. The gateway always uses the ptime requested by the remote
side for sending RTP packets.
• 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.
• For G.729, it's also possible to select silence suppression without
adaptations.
• 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).
• For an explanation on V.152 support (and implementation of T.38 and
VBD coders), refer to 'Supporting V.152 Implementation' on page 347.
• A pre-defined table can be configured to provide a set of rules for
automatic AMR rate change. The decision for the change is based upon
packet loss rate. To obtain more information about this option, contact
AudioCodes.
Table 5-10: Supported Coders
Coder Name Packetization Time Rate Payload Type Silence Suppression
G.711 A-law
[g711Alaw64k]
10, 20 (default), 30,
40, 50, 60, 80, 100,
120
Always 64 Always 8 Disable [0]
Enable [1]
G.711 µ-law
[g711Ulaw64k]
10, 20 (default), 30,
40, 50, 60, 80, 100,
120
Always 64 Always 0 Disable [0]
Enable [1]
G.729
[g729]
10, 20 (default), 30,
40, 50, 60, 80, 100
Always 8 Always 18 Disable [0]
Enable [1]
Enable w/o
Adaptations [2]
G.723.1
[g7231]
30 (default), 60, 90,
120
5.3 [0], 6.3
[1] (default)
Always 4 Disable [0]
Enable [1]
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