IPO analog trunks echo.

[Tinos]

Hi everyone.

I have some analog trunks connected to ipo on the combo V2 4U ATMs and 16 Trunk expansion module.
All the trunks have echo when call is in progress. Any ideas how I can reduce the echo?
In manager Echo Cancellation is ON and Echo Reduction is also ON.
Impedance match is 120+820II110nF

 

[vtphoneguy]

Have you tested the trunks with a butt set at the TELCO demarc to verify that the echo isn't coming from the CO?

 

[jayjr1105]

What IPO version? What kind of phones IP/Digital? Who is the telco?

 

[Tinos]

With a butt there is no echo. IPO R9.0.2, phones are a mix of 1608,1616 and 9611. Telco uses Huawei switches.

 

[Telecomboy]

IP Phones with analog lines can be a nightmare. I would bring a digital phone out to test and see if the digital phone sounds fine.

 

[Tinos]

The digital phone has the same echo. Just to try and make changes on the IPO what ideally what must I adjust.
I think if I play around with changes I should get a match. The only issue is I don't know were to start looking.