I have a system setup with two T1 circuits, the customer complains of
call quality issues. I've checked logs and don't see anything too
strange, but when I run "dahdi show status" I see:
Description Alarms IRQ bpviol CRC4
Fra Codi Options LBO
T2XXP (PCI) Card 0 Span 1 OK 0 0 19
ESF B8ZS YEL 0 db (CSU)/0-133 feet (DSX-1)
T2XXP (PCI) Card 0 Span 2 OK 0 0 774
ESF B8ZS YEL 0 db (CSU)/0-133 feet (DSX-1)
The value in the CRC4 column seems to be growing with time. From what I
understand CRC4 has to do with E1 circuits not T1. I am I missing
something? Is there any further debugging I can do? What could the CRC4
errors mean? I have check the SIP devices latency times and they are all
under 40ms so I'm pretty sure it's not an issue with the local network
or SIP device. Thanks in advance.
Asterisk Version: 1.6.2.7
Dahdi: 2.3.0
Kernel: 2.6.18_164.15.1.el5
/etc/dahdi/system.conf
span=1,1,0,esf,b8zs
fxsls=1-22
echocanceller=oslec,1-22
unused=23-24
echocanceller=oslec,23-24
span=2,1,0,esf,b8zs
e&m=25-48
echocanceller=oslec,25-48
/etc/asterisk/chan_dahdi.conf
[channels]
language=en
echocancel=yes
echocancelwhenbridged=no
echotraining=800
rxgain=0
txgain=0
group=0
callgroup=0
pickupgroup=1
faxdetect=no
callreturn=yes
cancallforward=yes
transfer=yes
context=from-zaptel
signalling=fxs_ks
rxwink=300
usecallerid=yes
hidecallerid=no
callwaiting=no
usecallingpres=yes
callwaitingcallerid=yes
threewaycalling=no
immediate=no
signalling=fxs_ls
language=en
context=from-zaptel
echocancel=yes
echocancelwhenbridged=no
rxgain=0
txgain=0
faxdetect=no
immediate=no
group=0,1
callgroup=1
channel => 1-22
signalling=em_w
callgroup=1
group=0,2
immediate=no
faxdetect=no
txgain=0
rxgain=0
echocancelwhenbridged=no
echocancel=yes
context=from-pstn
language=en
channel => 25-48
sip show peers:
Name/username Host Dyn Nat ACL Port Status
3200/3200 10.10.2.63 D N A 5060 OK (32 ms)
3202/3202 10.10.2.31 D N 5060 OK (12 ms)
3204/3204 10.10.2.88 D N A 5060 OK (13 ms)
3205/3205 10.10.2.85 D N 5060 OK (14 ms)
3206/3206 10.10.2.65 D N 5060 OK (12 ms)
3208/3208 10.10.2.68 D N 5060 OK (12 ms)
3210/3210 10.10.2.59 D N 5060 OK (9 ms)
3211/3211 10.10.2.75 D N A 5060 OK (13 ms)
3213/3213 10.10.2.72 D N A 5060 OK (8 ms)
3214/3214 10.10.2.10 D N A 5060 OK (13 ms)
3216/3216 10.10.2.91 D N A 5060 OK (13 ms)
3217/3217 10.10.2.23 D N A 5060 OK (8 ms)
3219/3219 10.10.2.66 D N 5060 OK (8 ms)
3221/3221 10.10.2.71 D N A 5060 OK (14 ms)
3223/3223 10.10.2.80 D N 5060 OK (12 ms)
3224/3224 10.10.2.37 D N A 5060 OK (14 ms)
3226/3226 10.10.2.83 D N A 5060 OK (14 ms)
