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Questions about A400/800/1200 Analog Interface Card
A1200P and ALAW codec
12 years 6 months ago #7416
by ddpaul
Hi.
I have A1200P card with bunch of FXO-100 and FXS-100 modules installed to the Asterisk box.
I use ALAW codec in my Asterisk setup. When I dial from PSTN to Asterisk extension through FXO port I have following warnings in Asterisk log:When Asterisk extension answers the warnings is stopped, channel codec switched to ALAW and everything works fine.
Then I tried to switch DAHDI channel to ALAW mode (with "alaw" option in /etc/dahdi.system.conf):After reload DAHDI modules:
# dahdi_cfg -vvvAfter Asterisk restart:It's seems like channel is really switched to ALAW.
When I repeat my dialing test I see that all warning messages are gone. So it's seem like my purpose is reached, but is's only at first glance
When Asterisk extension answers and call is established I get a new problem: distorted voice and with high volume crackling at background.
So my question is - can A1200P work correctly with "alaw" option set? Or it's tied to ULAW codec firmly?
I have A1200P card with bunch of FXO-100 and FXS-100 modules installed to the Asterisk box.
I use ALAW codec in my Asterisk setup. When I dial from PSTN to Asterisk extension through FXO port I have following warnings in Asterisk log:
[Oct 9 11:21:29] WARNING[8114] chan_sip.c: Asked to transmit frame type ulaw, while native formats is 0x8 (alaw) read/write = 0x8 (alaw)/0x8 (alaw)
[Oct 9 11:21:29] WARNING[8114] chan_sip.c: Asked to transmit frame type ulaw, while native formats is 0x8 (alaw) read/write = 0x8 (alaw)/0x8 (alaw)
[Oct 9 11:21:29] WARNING[8114] chan_sip.c: Asked to transmit frame type ulaw, while native formats is 0x8 (alaw) read/write = 0x8 (alaw)/0x8 (alaw)
[Oct 9 11:21:29] WARNING[8114] chan_sip.c: Asked to transmit frame type ulaw, while native formats is 0x8 (alaw) read/write = 0x8 (alaw)/0x8 (alaw)
[Oct 9 11:21:29] WARNING[8114] chan_sip.c: Asked to transmit frame type ulaw, while native formats is 0x8 (alaw) read/write = 0x8 (alaw)/0x8 (alaw)
...Then I tried to switch DAHDI channel to ALAW mode (with "alaw" option in /etc/dahdi.system.conf):
...
# Span 1: OPVXA1200/12 "OpenVox A1200P/A800P Board 13" (MASTER)
...
fxsks=9
alaw=9
echocanceller=mg2,9
...# dahdi_cfg -vvv
DAHDI Tools Version - 2.5.0.1
DAHDI Version: 2.5.0.1
Echo Canceller(s): HWEC, MG2
Configuration
======================
Channel map:
...
Channel 09: FXS Kewlstart (A-law) (Echo Canceler: mg2) (Slaves: 09)
...sip*CLI> dahdi show channel 9
Channel: 9
...
Default law: alaw
...When I repeat my dialing test I see that all warning messages are gone. So it's seem like my purpose is reached, but is's only at first glance
When Asterisk extension answers and call is established I get a new problem: distorted voice and with high volume crackling at background.
So my question is - can A1200P work correctly with "alaw" option set? Or it's tied to ULAW codec firmly?
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