[Asterisk-Users] Echo problem on conferencing....no analog interfaces

[Tom Lowe]

Now that actually brings up an interesting aspect.   "My" echo canceller
(the one at my end) would prevent the far end from hearing echo...so if
I don't have a canceller at my end, they would hear echo!  And, on a
local call, there's really no need to have an echo canceller...so I
guess that makes sense.

It still doesn't explain why one of the other two callers (both
accessing the conference exactly the same way) has echo and the other
doesn't.  

I guess I just have to live with the fact that mixing VoIP calls and TDM
calls on the same conference will simply have problems.  I assume there
are no other echo suppression settings that anyone can suggest.  

Tom



Tom Lowe, President/CTO
Compro Technologies, Inc.
512 South Main Street
Forked River, NJ  08731
My Phone:  +1-212-904-0788
Main Phone:  +1-609-242-2211
Fax:  +1-609-242-2212
Email:  tom at comprotech.com
Web: www.comprotech.com
 


-----Original Message-----
From: Steve Brown [mailto:sbrown at cortland.com] 
Sent: Thursday, December 04, 2003 7:43 AM
To: asterisk-users at lists.digium.com
Subject: Re: [Asterisk-Users] Echo problem on conferencing....no analog
interfaces


There are probably echo suppressors on both ends of the LD circuit 
between NJ and CA, but none on the local NJ circuit.

Steve

Tom Lowe wrote:

>Not a silly question.  I've given that thought.
>
>To be honest, I'm not sure what kind of phone the California or NJ 
>callers were using.  However, we've had numerous conferece calls using 
>many other services and have never had echo problems.
>
>The problem, in this case, more likely has something to do with the NJ 
>leg of the call (call 2), and possibly my leg (I was caller 1), since 
>the echo happened when it was just the two of us.  If anything, the 
>"problem phone" would be my phone.  This is a Lucent Partner phone 
>system and phone.  Now, if it was MY phone causing the problem, then 
>both caller's 2 and 3 should be hearing their echo.  But they weren't.
>
>I'm stumped.
>
>
>For anyone who's trying to figure out how I'm doing an E1 PRI here in 
>the US, it's working like this:
>
>Verizon T1/PRI  -->  Cisco VCO/4K (Programmable switch)  -->  E1/PRI 
>--> MyAsterisk
>
>The other 2 calls are going like this:
>
>888 number --> SS7 --> VCO/4K --> T1/PRI --> Asterisk_1 --> IAX --> 
>MyAsterisk
>
>Tom
>
>
>
>Tom Lowe, President/CTO
>Compro Technologies, Inc.
>512 South Main Street
>Forked River, NJ  08731
>My Phone:  +1-212-904-0788
>Main Phone:  +1-609-242-2211
>Fax:  +1-609-242-2212
>Email:  tom at comprotech.com
>Web: www.comprotech.com
> 
>
>
>  
>


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