Linksys Voice System Administration Guide
205
Setup
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.
Signaling
Signaling Port
The UDP port that the SPA400 uses to listen for incoming call setup
requests
Default:
5060
RTP
RTP Port
The base UDP port for the block of UDP ports that that the SPA400 uses
to send and receive RTP and RTCP packets
Default:
10000
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