Random Calls into all Polycom Systems

Occasional Visitor

Random Calls into all Polycom Systems

I want to see if others in this community are experiencing the same issue and found a possible fix. 


I deal with 72 endpoints in school settings. Most of these are HDX Series Polycoms with a handful of VSX 7000's thrown in and a LifeSize or two. Several of these units (all variety's of models, software versions) are receiving random calls that will connect with loopback video. There is no video or audio from the other site. The IP that is dialing in varies as well. Sometimes it disconnects itself after a few minutes, sometimes we have to manually disconnect. The most common name that appears from the dialer is CISCO. 


SIP is turned off, they are not SIP calls. Which we have dealt with before. We do daily classes with the equipment and have auto-answer turned on so that the someone doesn't have to answer the call each hour. Most of the classes are being automatically dialed through a bridge. I would rather not have to turn the auto-answer off due to this. 


For those units that have an internal MCU, then the call will ring while it is currently in a class...very annoying to students and teachers! We have tried turning off snmp. But I don't have any other ideas. 


If you have seen this or know a fix, please let me know! Thank you!!

Message 1 of 5
Polycom Employee & Community Manager

Re: Random Calls into all Polycom Systems

Hello audramay,

welcome to the Polycom Community.

This is a bit similar like someone calling your Phone number.


You need to identify the IP address or range from which this calls originate and then block these in your firewall.

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


If official support is required please check how to phone or open a case here

The title Poly 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. All posts and words are my own & do not represent the views of Employer.


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 5
Occasional Visitor

Re: Random Calls into all Polycom Systems

I'm seeing the same thing here at my University. Random dial ins from various IP's. Checking the whois on these IP's reveals various origins - some international and some in the US. Looking at the call detail log it appears to be happening as frequently as every 4 minutes and that appears to be a repeating pattern on some codecs (4 minutes between calls and never with the same IP). I have considered creating a whitelist to add to our firewall to block all unknown IP's. What did you do to remedy the situation, or is it still occuring?

Message 3 of 5

Re: Random Calls into all Polycom Systems

We have also seen this, and are looking into ways of reducing the disruptive impact on non-VC classes. It adds an extra step, but if you turn on the "Do Not Disturb" function the calls do not cause the VC Unit to ring, just don't forget to turn it off again when you want a call to come in! We use external control systems (AMX, Extron) so adding that trigger based on room use status should be easy, but not everyone, even us, has systems like that in every room.

Our Infrastructure guys are hesitant to block ranges, or that many individual IP's, so we are looking at blocking them when we can at the Polcom itself.



Message 4 of 5
Occasional Visitor

Re: Random Calls into all Polycom Systems

We are experiencing the same thing at our University.  I have found that if you go into the Audio Settings and set the Sound Effects Volume to 0, the Polycom will not ring during the class.  

Message 5 of 5