VoIP Profile Configuration
321
Procedure
To disable post and high-pass filter
Mode
Profile VoIP
Command
Purpose
Step 1
node
(pf-voip)[
name
]#no post-filter
Disable decoder output filter
Step 2
node
(pf-voip)[
name
]#no high-
pass-filter
Disable decoder input high pass filter
Example: Disable Filters
The following example shows how to disable the decoder output post-filter and the input high-pass
filter of the VoIP profile.
SN>
enable
SN#
configure
SN(cfg)#
profile voip ISoIPProfile
SN(pf-voip)[ISoIPPr~]#
no post-filter
SN(pf-voip)[ISoIPPr~]#
no high-pass-filter
32.10 Configure FAX handling
Fax is a protocol for electronically transmitting written material in-band over a voice channel. In
traditional public switched telephone networks (PSTN) it is handled as well as pure voice.
Traditional fax devices scan written material and transform it in tones which are transmitted over the
telephone network. The receiver puts together the tones and constructs back the written materials. In
IP networks several problems appear which impede to handle fax-data similarly to voice streams:
-
If one or more RTP packets which transports the voice (tones) are lost, the receiver can’t
reconstruct what the sender sent.
-
Codecs other than G.711 compress the voice streams. They are optimized for compressing
voice and not data. Compress and decompressing always incur loss of data.
- Dejitter buffers are optimized to force little voice delay, therefore data could be lost.
SmartWare implements two solutions to solve this problems on fax transmission:
- Fax bypass: Selects automatically a fallback codec with no or little compression and reconfigures
the dejitter buffer for sending and receiveing fax.
- Fax relay:
Terminates the fax protocol on the SmartNode and sends the reference data over a
fax protocol (T.38) to the receiver. Fax relay has a smaller bit- and error-rate than
bypass, but the remote endpoint must support the same fax protocol as well.
Figure 32-8 illustrates the difference between fax relay and fax bypass.
Software Configuration Guide Release 2.10, Revision 1.00
Summary of Contents for SmartWare Release 2.10
Page 2: ...2 Legal Notice Software Configuration Guide Release 2 10 Revision 1 00...
Page 15: ...Terms and Definitions 15 Software Configuration Guide Release 2 10 Revision 1 00...
Page 218: ...218 PPP Configuration no shutdown Software Configuration Guide Release 2 10 Revision 1 00...
Page 272: ...272 Tone Configuration Software Configuration Guide Release 2 10 Revision 1 00...
