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Sound from the other side stopped when we show a powerpoint presentation

Occasional Visitor

Sound from the other side stopped when we show a powerpoint presentation

Each time when we use Polycom 700 to connect a remote site they use Polycom 300 everything is ok at first.


However, after we show a powerpoint presentation we cannot hear the sound from the remote site anymore.


Would anyone provide the answer ?


Thank you very much.

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Polycom Employee & Community Manager

Re: Sound from the other side stopped when we show a powerpoint presentation

Hello Tony,

welcome to the Polycom Community.

It is always useful to include the currently used Software version as issues experienced may already be addressed in a newer release.

This also allows yourself and others to check against current software release notes.

In addition you may want to look at the Video FAQ post here:


  • Jun 21,2014 Question: Are there specific Ports in my firewall that I need to open in order to utilize video conferencing?

    Answer: Please check the relevant release notes or admin guide for your device under the section “Inbound and Outbound Ports” or "Port usage" => here <=.

    In addition check this FAQ post => here <= for more details and troubleshooting suggestions.

The above should give you enough guidelines on how to troubleshoot this as you need separate ports for Audio, Video People, Video Content and Far End Camera Control (FECC).


Once you add content to a call the Group Series re-negotiates video etc. by closing and re-opening and this may cause your firewall to block the newly setup ports.

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


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
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