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Voice Gateways System Manual 47
SS The SS (Silent Suppression) option for outgoing calls. When the
SS option is enabled, silence intervals are identified and only
relevant information is transmitted, using less bandwidth than
during voice activity intervals. This allows for a better overall
utilization of the available bandwidth. It is possible to enable
Silent Suppression with G729 codec. Silent Suppression is not
applicable when using the G711 codecs.
The default (G729) is SS disabled.
EC The EC (Echo Cancellation) option, defines whether to activate
the echo cancellation mechanism for improved voice quality. EC
is not used during Fax (T.38) transmissions.
The default is enabled.
Packet The packet size in milliseconds.
The range is from 10 to 150 milliseconds.
The default is 30 ms for G729 and 20 ms for G711A and G711U.
Keypad The "Keypad" field indicated which transmission method to be
used for user input DTMF signaling (i.e. phone banking). "None"
means in-band, which should be used with G.711 only.
For SIP model the options are None, RFC2833 and SIP INFO.
RFC2833 and SIP INFO should be used primarily with G.729
but could also be used with G.711. The default is None for G711
codecs and RFC2833 for G729.
For H323 model the options are H225, H245, RFC2833 and
None. The default is None for G711 codecs and H225 for G729.
Priority The Priority parameter defines the relative priorities to be offered
during capabilities' exchange. If only G711A and G711U are
used, the permitted priorities are 1 and 2.
If all 3 codecs are used, the permitted priorities are 1, 2 and 3.
Voice codec negotiation/priority is always performed between 2
end-points and depending on which side initiated the
negotiation.
The default is Priority 1 to G711A, Priority 2 to G711U.
Table 3-8: Codecs and Fax Configuration Parameters
Parameter Description