noise when tallk to analog cordless

[Dean Benazic]

Hi, i'm using cheep ($25) HFC-S ISDN to dial out from my home to the local 
PSTN. using i4b and capi 1.6.1 on FreeBSD 6.1, asterisk...

The problem is that I hear a loud noise when talking with other PSTN clients 
who have classic analog cordless phones, when talking louder the noise is 
louder and no noise when the line is silent.

On my site I have analog phones on FXS ports. The problem does not exist when 
the line with PSTN network is through the FXO module of the TDM card.


$pciconf -l -v
ihfc0 at pci4:1:0: class=0x028000 card=0x2bd01397 chip=0x2bd01397 rev=0x02 
hdr=0x00
    vendor   = 'Cologne Chip Designs GmbH'
    device   = 'HFC-S PCI A ISDN 2BDS0 ISDN HDLC FIFO Controller'
    class    = network

/usr/local/etc/asterisk/capi.conf

nationalprefix=0
internationalprefix=00
rxgain=1.20
txgain=1.20

;ulaw=yes        ;set this, if you live in u-law world instead of a-law
debug=no       ;set this, if capi debugging should be enabled by default

[ISDN1]

ntmode=yes       ; note that this does NOT switch the card to NT-mode!
isdnmode=did     ; note that NT-mode should use "did"
incomingmsn=*    ; all numbers accepted
controller=0
group=1          ;dialout group
;
; If you want to use DTMF operated services on your external
; ISDN network, you have to disable softdtmf until further.
; Disabling softdtmf will cause the Asterisk demo to not work,
; except that one gets the sound.
;
softdtmf=off

; relaxdtmf=on   ;in addition to softdtmf, you can use relaxed dtmf detection
accountcode=1     ;Asterisk accountcode to use in CDRs
context=isdn_in_nt ;context for incoming calls
holdtype=local   ;when Asterisk puts the call on hold, ISDN HOLD will be used. 
If
                 ;set to 'local' (default value), no hold is done and Asterisk 
may
                 ;play MOH.
;immediate=yes   ;immediate start of pbx with extension 's' if no digits were
                 ;received on incoming call (no destination number yet)
echosquelch=1    ; primitive echo suppression (it is recommended to use this)
;echo_offset=32    ; units of 32 milliseconds (default)
echocancel=yes    ;EICON DIVA SERVER (CAPI) echo cancelation
                 ;(possible values: 'no', 'yes', 'force', 'g164', 'g165')
;echocancelold=6 ;use facility selector 6 instead of correct 8 (necessary for 
older eicon drivers)
devices=2        ;number of concurrent calls on this controller
digit_timeout=25  ;number of seconds to wait for additional digits

Thanks for any help.