[asterisk-users] PRI connection with ZTE exchange over T1 PRI

[Si Tai Fan]

Hi

My production Asterisk has these frequent errors when connected to the 
ZTE type exchange...

Jun  9 10:48:24 NOTICE[1984] chan_zap.c: PRI got event: HDLC Overrun (7) 
on Primary D-channel of span 1
followed by..
Jun  9 11:46:42 WARNING[1984] chan_zap.c: No D-channels available!  
Using Primary channel 24 as D-channel anyway!

After a few moments later, the D-channels comes up automatically.


My settings are as follows:-
*zaptel.conf*
span=1,1,0,esf,b8zs
bchan=1-23
dchan=24
loadzone = us
defaultzone=us

*zapata.conf*
[trunkgroups]
[channels]
language=en
context=pstn_default
switchtype=national
signalling=pri_cpe
usecallerid=yes
hidecallerid=no
callwaiting=yes
usecallingpres=yes
callwaitingcallerid=yes
threewaycalling=yes
transfer=yes
canpark=yes
cancallforward=yes
callreturn=yes
echocancel=yes
echocancelwhenbridged=yes
echotraining=yes
echotraining=400
rxgain=0.5
txgain=0.5
group=1
callgroup=1
pickupgroup=1
immediate=no
callerid=asreceived
channel => 1-23

Any suggestions?

Thanks,
Si
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