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blswjames

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Hello forum,

PBX = Kerio Operator v2.2.0
Phones = Snom 821 with Firmware version 8.7.4.8 (beta)
All devices are getting PoE, are on the same subnet, and no NAT.

We have recently encountered a new behavior in our phone system, where someone will call another extension from within the building, and the caller will hear their own voice in the receiver at 200% volume with about a half second delay. They tell me that it's so obnoxious that they have to use their phone like a walkie-talkie by cupping their hand over the receiver while talking, then lifting it to hear the other person respond. This results in a very asynchronous mode of conversation.

This behavior does not happen on every call, and when it does, it usually clears itself up after about one minute of conversation. So far, it has been reported from several different users, and therefore is not localized to any one area of the building.

Earliest report of this happening is 4 days ago on Monday. Given that both Operator and the phones received updated software around the same time (last Saturday), I am having difficulty determining which is more likely to be the culprit. Therefore, I am posting this in both forums in hopes that someone might have encountered this before and might know what I can do about it.

-james
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Filip Jenicek (Kerio)

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Hi,

it sounds more like a phone issue. I haven't encountered such behavior personally, but I think there were some people on the forums who have described some sound issues. If you want to rule out Operator, make a packet dump capturing the issue and analyze it with wireshark (or email it to me:).

Filip
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blswjames

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I agree, that Operator seems unlikely to be at fault. It occurred to me that it might also be from a poorly executed QoS plan. Despite having a solid gigabit LAN everywhere, sometimes other equipment and/or traffic congestion can cause micro delays in packet routing. We switched from using an "Automatic VoIP" QoS feature to using a more finely tuned DiffServ configuration. I am waiting to see if any users continue to experience the issue or not.

Something else we started to do in the provisioning step is to enforce the G.711u audio codec. We are trying to ensure that only that codec gets used so that there are no audio conversions being performed along the way.
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