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VoIP profile configuration task list 586
SmartWare Software Configuration Guide 47 • VoIP profile configuration
Mode: Profile VoIP
Procedure: Configure fax relay (T.38)
Mode: Profile VoIP
Step Command Purpose
1 node(pf-voip)[name]#fax transmis-
sion bypass g711alaw64k
Adds fax bypass transmission with codec G.711
to the list of fax transmission modes.Alternative
codecs available are:
• G.711uLaw
• G.726 32kbps
• G.726 24kbps.
2
optional
node(pf-voip)[name]#fax dejitter-
max-delay buffer-size
Sets the size of the dejitter buffer during fax trans-
missions. The operating mode of the dejitter buffer
is automatically set to fax optimized static-data
mode.
Patton recommends that you keep the size for fax
transmissions higher than that used for voice, since
fax is less sensitive to delay than packet loss.
The default value is 200ms which should be nomi-
nal for almost any transmission network. In excep-
tional cases it may be necessary to increase this
value (maximum 400ms).
Step Command Purpose
1 node(pf-voip)[name]# fax transmis-
sion relay t38-udp
Adds fax relay transmission with T.38 protocol
over UDP to the list of fax transmission modes.
2
(optional)
node(pf-voip)[name]#fax
redundancy ls low-speed-redundancy hs
high-speed-redundancy
Packet loss can be avoided by transmitting the fax
data packets several times. This can be configured
separately for low speed and the high speed traf-
fic. The default for both parameters is 0 (no redun-
dant transmission). Note that values greater than 0
provide more reliable transmissions, but consume
additional bandwidth.
3
(optional)
node(pf-voip)[name]# fax dejitter-
max-delay buffer-size
For proper operation, a dejitter buffer is used on
the receiver. The dejitter period can be set to com-
pensate for the jitter imposed by the network. The
default value is 200ms which should be nominal
for almost any transmission network. Only in
exceptional cases it may be necessary to increase
this value (maximum 400ms). The dejitter buffer,
by default, applies the operation mode ‘static-
data’, i.e. minimizes the packet loss.