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SPA400 Field Reference
Setup
SPA9000 Voice System Administration Guide 264
C
Setup tab>
Voice
NOTE The default settings should be sufficient in most use cases. These settings should
be adjusted only after consultation with a service technician for the telephone
company. It is essential that these settings are compatible with those of the Central
Office.
IP Tos/DiffServ
Call Signaling Packets TOS field in IP header for outgoing SIP packets
Default: 68
RTP Packets TOS field in IP header for outgoing RTP/RTCP packets
Default: b8
Session
Enable Session Timer Enables the SPA400 to encode the Timer header in all
INVITE requests for ringing timeout (checked by default)
Desired Refresh Time Desired session timer in seconds (0 by default)
Minimum Refresh Time Minimum value of the session timer in seconds (0 by default)
Voice Codecs
Preferred Codecs
Preferred Codec The preferred voice codec that SPA400 uses to negotiate
with remote VoIP devices to determine the voice codec for a
call: G.711U, G.711A, or G.729
Voice Codecs
Packetization The packetization time in milliseconds for each codec:
G.711U, G.711A, G.729
VAD Voice Activity Detection (OFF or ON)
Default: OFF