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ESP Projects

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We have a Kerio phone system with:
1x Digium 1A4B00F 4 port modular analog PCI-Express
2x Digium X100M FXO Module

So far we are getting really bad echo on calls both incoming and outgoing, there is an optional "Echo cancellation" module which seems to sort this out, but are there any setting within Kerio that we can alter to try to get rid of the Echo?

Caller ID also doesn't seem to be working. When we plug a phone directly into the analogue line, the number displays fine, but when it goes through the Kerio box, it just shows up as "0"
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Filip Jenicek (Kerio)

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Hi,

the hardware echo canceler doesn't have any settings, you just plug it into the card and it should start working.

Regarding Caller ID, make sure that the card is configured with the correct Country and Signalling. If you feel that it is all configured correctly and it still doesn't work, feel free to contact via email <fjenicek<_at_>kerio.com>.

Best
Filip
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ESP Projects

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Thanks for the reply, I'm not sure what settings I need to change and where for the caller ID. We've got

Interface:
Caller ID signalling - smdi
Caller ID start - ring

Advanced:
SIP Alert info for incoming calls - operator-external
Signalling - fxs_ks
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Filip Jenicek (Kerio)

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Which country is the installation at?
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ESP Projects

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It is in the United Kingdom
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Filip Jenicek (Kerio)

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I believe the correct setting for UK is:
Caller ID signalling = v23
Caller ID start = polarity
Signalling - fxs_ks
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ESP Projects

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Thanks Filip, that's sorted out the caller ID now.

In terms of Echo cancellation, is the only way to eliminate it to get one of those echo cancelation cards, or are there any settings we can change on either the phones or Kerio? We are using Yealinks, T46G W52P and T26P.
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Filip Jenicek (Kerio)

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I'm afraid the only thing that truly works is the hardware echo canceller. The software echo canceller, which is built in Asterisk, gives very poor results. I don't have much experience with fine tuning it. If you are not afraid of modifying asterisk configuration files, read < http://kb.digium.com/articles/Troubleshooting/General-Echo-H OWTO>.
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Vladimir Toncar (Kerio)

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The Digium 1A4 cards do not have the connector for attaching the optional echo canceller. You must decide at the time of the purchase whether you want the echo canceller or not.

Do you hear the echo at all times or just when calling to some destinations? (Like cell phones?). The fact is that VoIP makes the original analog echo more notable because the jitter buffers used by the VoIP phones delay the signal, thus shifting the echo further away from the point in time where it was created.

You might ask your telco to check the quality of your last-mile connection. The typical place where the echo is created is the A/D converter in the telco's PBX that converts the analog signal from your PSTN line to G.711 or whatever codec they are using on their digital backbone.
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ESP Projects

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We will probably just change the card for one that has hardware echo cancellation built-in in that case. What cards are recommended? we would like to be able to re use the FXO modules we have already bought if possible...
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Vladimir Toncar (Kerio)

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I guess the analog 1A4 card with HW echo canceller is model number 1A4B01F but check with your retailer to be sure. The FXO modules are reusable.
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ESP Projects

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Thanks Vladimir, we have used the echo canceller as you mentioned and this has solved the call quality issues completely
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