[Asterisk-Users] Best drivers for HFC-S ISDN cards

[Chris Bagnall]

I said:
> I've tried isdn4linux (severe echo, reproducable on every 
> inbound call) and zaphfc (intermittent echo, disappears 
> within about 30 secs of the call starting).

Many thanks to those who replied. General consensus seems to be switching to
mISDN or CAPI won't solve the intermittent echo problem. A follow-up with
some more config information:

Zaptel.conf
span=1,1,3,ccs,ami
bchan=1-2
dchan=3
span=2,1,3,ccs,ami
bchan=4-5
dchan=6
loadzone=uk
defaultzone=uk

Zapata.conf:
[channels]
language = en

pridialplan = dynamic
nationalprefix = 0
internationalprefix = 00

switchtype = euroisdn
signalling=bri_cpe_ptmp
group=1
context=isdn
channel => 1-2

switchtype = euroisdn
signalling=bri_cpe_ptmp
group=2
context=isdn
channel => 4-5

echocancel=yes
echocancelwhenbridged=yes
echotraining=no
;echotraining=800
rxgain=0.0
txgain=0.0
immediate=yes

I've tried echotraining off, on, 100, 400 and 800, none of which seem to
help matters very much. Any suggestions for getting rid of echo on these
lines would be gratefully appreciated.

Regards,

Chris
-- 
C.M. Bagnall, Director, Minotaur I.T. Limited
Tel: (07010) 710715   Mobile: (07811) 332969   Skype: minotaur-uk
ICQ: 13350579   AIM: MinotaurUK   MSN: msn at minotaur.cc   Y!: Minotaur_Chris
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