[Asterisk-Users] YET Another echo issue PRI CARD Any help accepted :-)

[Michael D Schelin]

Hello, I too am having an echo issues. My partner an I have discussed 
this in depth and believe that digital circuits can not create the echo 
problem.  It's when it hits the Analog network or in my cases ATA's that 
are having echo problems. I have another gateway that does not have any 
echo on the same Sipura ATA's. I have also notices that the Asterisk 
levels are very hot from T1-PRI to Sip.  I have not had the chance to 
turn them down but I think this is where my echo problem  is occurring 
because the Digital levels are too much for the ATA to convert.  I will 
let you know if I find this to be true.

Michael Schelin / ShellTel


Ronald Hartmann wrote:

>Good Day all,
>
>	I have a Fractional PRI connected to my Asterisk Box via a T100P
>card.
>
>	When I initiate a call out to phone number 123-8888 the call
>sounds great no echo what so ever.
>
>	If the person at 123-8888 hangs up and calls me right back (same
>handset on both sides) same trunk line
>	The call always has echo on it.  The Asterisk sip extension
>hears them selves echoing.  The remote party does not notice any
>difference.
>
>	I have tried all the following.
>
>       #define CONFIG_ZAPTEL_MMX  <tried this defined and undefined>
>
>	Then tried each of the following types of echo cancellations.
>
>       #define ECHO_CAN_MARK
>       #define ECHO_CAN_MARK2 with and without #define
>AGGRESSIVE_SUPPRESSOR
>       #define ECHO_CAN_MARK3
>
>I am completely at a loss on how to get rid of this echo problem. The
>system is completely useless for incoming calls, as it currently stands.
>Is there a Digium card that handles echo better? Are there any asterisk
>compatible cards with hardware echo cancellation available?
>
>Thanks
>
>Ron
>
>	[Zapata.conf]
>       span=1,1,0,esf,b8zs
>       bchan=19-23 # set this to 1-15,17-31 for E1
>       dchan=24 # set this to 16 for E1
>
>       defaultzone=us
>       loadzone=us
>
>	[Zaptel.conf]
>[channels]
>language=en
>
>signalling=pri_cpe
>switchtype=national
>pridialplan=unknown
>echocancel=yes 
>echocancelwhenbridged=yes (tried no)
>echotraining=400 (tried 800 also)
>usecallerid=yes
>callerid=asreceived
>overlapdial=yes
>immediate=no
>group=0,1
>context=from-pstn
>channel => 19-23
>
>
>
>_______________________________________________
>Asterisk-Users mailing list
>Asterisk-Users at lists.digium.com
>http://lists.digium.com/mailman/listinfo/asterisk-users
>To UNSUBSCRIBE or update options visit:
>   http://lists.digium.com/mailman/listinfo/asterisk-users
>
>
>  
>