Problem with Echoing on BCM 400

[ArtooD2]

I have installed BCM 400 with 2 x full PRIs few weeks ago.
Two DTM cards were installed in the main unit. I set one card to be Bus 6 (clock source: Secondary External) and Bus 7 (clock source: Primary External).


The customer complaints Echo can be heard very loud during the incoming or outgoing calls. It is intermediate problem.

They could get as many as 30 or more incoming calls at ones. Not all going through AA.

I have tried everything to pin point the problem.

I opened trouble ticket with a T-1 provider for stress test. Their respond was No Trouble Found. Easy to say!
I replaced some T-7316 E phones. I moved some phones to new ports on second card DSM 16. I replaced DTMs cards. They are still complaining about echoing.
System is fully patched in.


Any Ideas?

Thank You All

 

[biv343]

Try changing the line buildout on the CSU to 7.5 or 15db. Sometimes that will help with echo on digital cicuits. I'd try 7.5 first and see if that helps.

 

[telcodog]

Under Telephony Resources, open up your PRI parameters and check to see what you have your interface level set to. It will either be ISDN or PSTN. Usually this is set to ISDN but not every PRI vendor is set up the same. Try changing that from what it is to the other and see if that changes anything. Essentially that setting determines who is doing the loss plan. If it's set wrong you will experience the type of issues you are having.

If it matters, the db ratings are as follows:
ISND SLR 8db (Send Loudness Rating)
RLR 2db (Recv Loudness Rating)

PSTN SLR 11db
RLR -3db

The CSU line build deals with the level of the transmitted signal and only appears if you have Internal CSU checked. I don't believe it has anything to do with echo problems (I've never known it to anyhow but you never know). I've never had any problems with leaving it set at 0db.

 

[gberger]

Make sure to set volume to "user set volume" instead of the default "system volume" and have the users that complaints to lower the volume while talking with external callers. Same thing applies for users that have headsets, specialy for those with amplifier(like plantronics wireless with lifter) they can lower the "transmit" volume which usually fix the echo.

 

[Deweyhumbolt]

I'd make Bus 6 my Primary and Bus 7 Secondary, worth a try.

Adversity is Opportunity

 

[ArtooD2]

Hi everyone,

Thanks for quick reply.

I have not seen the customer yet. I may go there next week.

I will definitely try all of these options.

Thanks