BCM50 R3.0 ECHO ON IP PHONES 1140e & 1120e

[sroggero]

We are having a huge echo problem with one of our customer.

Setup is 17 IP 1140 Set vs 4 M7324

Echo is heard on incoming calls from all IP sets only. We tried all the possible settings like SHORT,MEDIUM & LONG CO, Codecs are now set to auto but we did try them all... we are using regular PSTN lines.

We tried the latest core telephony & system patches that cames out last week and we are still having echo.

Please help... customer is now ready to swap all his sets back to digital :|

 

[DaddyOfThree]

Is it safe to assume that the BCM50 is attached to the same network switch as the 1120e/1140e phones? Is this a network delay problem(QoS) or a codec/firmware problem? If the phones are not connected to the same network switch I would suggest moving just one and seeing if the problem exists when the phone is literally next to the BCM50 connected to the same switch. Is it safe to assume that there is no issue phone to phone? You've tested the PSTN lines with a butset and they sound fine right?

I'm using G.711 with a payload size of 20ms without issue on a number of SRG50 (same hardware ans software different keycodes than BCM50).

What phone firmware are you running on the 1120e and 1140es?

The latest release is 0625C4L(1140e) and has a number of fixes. In an SRG50 R3.0 the phone firmware is downloaded from the Succession 1000 Call Server (it actually comes from the Signaling Server). It's refered to as the "Enhanced Firmware Download" by Nortel. Prior to that feature you need to download special patches for the SRG which would update the phone firmware on the SRG (BCM). I'm not sure how you can update the phone firmware on a true BCM50.

Good Luck!

 

[sroggero]

Our customer is running all IP Set on a separate Network based on the BES50 PoE switch and the BCM50 in installed on this swith either.

We are expecting no echo between IP Phones using the intercom key and digital phones are getting no echo on external analog trunks.

I will check howto and if the phone firmware can be updated... I am now out of idea so any suggestions will be tried .... we do have hundreds of BCM50 sites working A1 and this one is giving me hard time.

Thanks,

 

[gberger]

Could be the pstn lines not well balanced but you'll have to proof that to the telco...HAve you tried modifying the trunks to short or long CO?(by default they are set to medium CO). Is the customer ready to go with a fractionned PRI?

 

[sroggero]

We tried them all from Short to long CO...

It makes a difference for let say... 2-3 days. Then the echo comes back.

I've been told to check the voltage on the lines, apparently if it is more than 50 Volts... it may create echo on IP phones... does anyone ever experience this issue or is this possible that high voltage causes echo.

 

[Deweyhumbolt]

Yes, I installed 8 BCM50s in Diego, with 2 of them in the same high rise. Echo problem only with the two in same building. I noticed they were using the same telco. But one moved an existing fax from a different floor (different telco). Punched fax down as test line--No echo.

We bought this analog line tester from Nortel, proved fluncuating voltage on all 8 telco lines, fax line tested good. Referred to telco, problem fixed.

Adversity is Opportunity

 

[sroggero]

Do you have any part number or model for that tester,,,, I've talk to Westcon which is our Nortel distributer and they don't know about this line tester...

What I did to test it in our office was with a regular voltmeter and it indicates 48.085 Volts... I will probably do the same at the customer site but having the right tool looks much more professional...

Thanks for the hint

 

[Deweyhumbolt]

Sorry, I'm not good with part #'s. It's very kool, it tests for allot more than just voltage. I've heard it discussed on here before, someone will respond.

Adversity is Opportunity

 

[Skyfall]

Check with the Nortel Website, there was a bulletin re this BCM50 Line Tester.

Always learn from someone, something and somewhere......

MC

http://www.tomkin.ca