User guide

39
Vo i p pa ra m et e rs
The VoIP Protocol Parameters control various common aspects of the ATA device. These include:
• AudioSettings
• RTPProtocolParameters
• SDPProtocolParameters
• SDPAudioCodecNames
Audio Settings:
Parameter Description Default
voip preferred codecs List of numeric codec types in
order of preference
18 0
voip silence supression enable Enables comfort noise/silence
processing
Disabled
voip echo canceller enable Enables the G.168 echo canceller Enabled
voip echo canceller mode Sets the echo canceller operat-
ing mode
2
voip echo canceller tail length Specieslengthofechocancel-
ler in msec
16
voip fax processing mode Control for FAX processing
method: off, pass through (uLaw
or Alaw) or real-time FAX (T.38)
Off
voip fax processing rate Controls the fax processing rate
(0 to 5 for 2400 to 14400 respec-
tively)
5
RTP Protocol Parameters:
Parameter Description Default
rtp port minimum The minimum RTP port number
to be used
1234
rtp port maximum The maximum RTP port number
to be used
65535
rtp public external ip address ForceaspecicexternalIP
address for SDP messages sent
(disabled when 0.0.0.0)
0.0.0.0
rtp public external port min SpeciesthexedRTPportmap-
pingperformedbyaNATrewall
associated with the minimum
RTP port number (disabled when
0)
0
rtp tos value Type of service (TOS) value or
DIFFServ DSFIELD used for SIP
messages as a hexidecimal value
0x68
rtp packet duration The duration in msec for frame-
based codecs
30
rtp stream duration The duration in msec for sample
stream-based codecs
20
rtp session timeout interval The session timeout interval in
seconds
120