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what is a CCB?

Occasional Visitor

what is a CCB?



I am having difficulties with the Cx3000.


Callers can call eachother. There is just no audio.


Get this error messsage "4|02|rtosNetwork: netwTask() -Can't find associated CCB"


My question is, what is a CCB?


And if somebody has experience with this issue, please share :-)


Any help would be appreciated.

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Polycom Employee & Community Manager

Re: what is a CCB?

Hello Idriz,

welcome to the Polycom Community.

The CX3000 is a LYNC only phone and to my knowledge would not output an Error Message like the above.


The type of error you posted points to one of our SoundStation / SoundStation / VVX Phones.


This usually happens when the phone receives and RTP packet before the phone has setup an RTP connection.


I would suggest you try and reproduce this issue and provide your Polycom reseller with a wireshark trace so they can raise a case with Polycom support if needed.

Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.

Best Regards

Steffen Baier

Polycom Global Services

The title Polycom Employee & Community Manager is a community setting and does not reflect my role. I am just a simple volunteer in the community like everybody else. My official "day" Job is 3rd Level support at Poly but I am unable to provide official support via the community.


Notice: This community forum is not an official Poly support resource, thus responses from Poly employees, partners, and customers alike are best-effort in attempts to share learned knowledge. If you need immediate and/or official assistance please open a service ticket through your proper support channels.
Please also ensure you always check the VoIP , Video Endpoint , Skype for Business , PSTN or RPM FAQ's
Message 2 of 2