AXE4DL User Manual with DAHDI
www.atcom.cn
13
5. How to check if the hardware echo cancellation works or not
1)
After booting the server with the AXE4DL and the echo cancellation module, please run
the “dmesg” command to check if the hardware is detected or not.
Users will get the following information.
VPM450: echo cancellation for 128 channels
wct4xxp 0000:05:04.0: VPM450: hardware DTMF disabled.
wct4xxp 0000:05:04.0: VPM450: Present and operational servicing 4 span(s)
2)
When users are using the hardware echo cancellation module, please disable the
software echo cancellation in “/etc/dahdi/system.conf”, and enable the parameter:
“echocancel=yes” line in the “/etc/asterisk/chan_dahdi.conf” file.
After do that, please restart dahdi and asterisk.
3)
Run asterisk, and make a call by channel 1, users can get the following information
marked with red line, if the the echo cancellation module is working.
Notice: If users enable the software echo cancellation, it can get the following red lines also.
So please disable the software echo cancellation when users use the hardware cancellation.
localhost*CLI> dahdi show channel 1
Channel: 1
File Descriptor: 17
Span: 1
Extension: 300
Dialing: no
Context: from-pstn
Caller ID: 900
Calling TON: 33
Caller ID name: 900
Mailbox: none
Destroy: 0
InAlarm: 0
Signalling Type: ISDN PRI
Radio: 0
Owner: DAHDI/1-1
Real: DAHDI/1-1
Callwait: <None>
Threeway: <None>
Confno: -1
Propagated Conference: -1
Real in conference: 0
DSP: yes
Busy Detection: no
