Echo on door phone

[Mattmayn]

I have a Valcom door answer system (speaker with a button to request entry) and it connects to a LS trunk port on the 3300. The problem I am having is that for the first several seconds of a call the called party (anyone inside the customer site) can hear themselves echo back in the handset. You can't hear it over the speaker outside. All of the phones are IP sets.

Any ideas? I assume this would be an option in the circuit descriptor for the trunks, I just don't know where to start.

[martyn]

Ask people to knock only once. If they knock twice then it can make some people think it is an echo.

Sorry, couldn't resist 

[jrg0852]

I've had this before. Try making all of your settings under CO Trunk Circuit Descriptor as such:

   
 Number 10
 Line Start Type Loop
 Post Call Metering No
 Guard Timer 800
 Calling Party Disconnect No
 Dictation Trunk No
 Ignore Far End Disconnect No
 Disconnect Timer 500
 Ignore Far End Reversal During Seizure Yes
 Ringing Expected Yes
 Seize Timer 10
 Address Signalling DTMF
 Fake Answer Supervision After Outpulsing Yes
 Ignore Answer Supervision Yes
 Release Supervision Expected No
 Audio Inhibit Until Answer Supervision No
 High Loss Option No
 Balance Network Setting National Complex
 Trunk Category Short
 Perform seize test on out-of-service trunks Yes
 Ground Condition During Busy Out Removed
 First Meter Pulse Is Answer No
 Minimum Ring Detection Timer 200
 Drop Digit Rcvr for Outgoing Audio Before Ans Sup Yes
 Flash Timer 300
 Call Clearing Signal Disconnect
 AC Impedance National
 CLASS Trunk No
 Milliwatt Tone 
 Silence Tone 

[Mattmayn]

I tries these settings and it didn't make a difference.

Anyone else have any ideas?

[ralph]

We recently had to deal with a bad echo on a page port.
We resolved it with an echo canceler from Sandman

www.sandman.com/echo.html

Ralph