Solved

Polycom making SIP calls to itself

Posted on 2013-11-07
10
921 Views
1 Endorsement
Last Modified: 2013-11-08
We have several Polycom video conferencing system and all of a sudden we've noticed that they are calling itself every 5 minutes or so.  It goes on for a few hours and stops.
Do you have any idea why it is doing this?
It says call from 202@my public IP
1
Comment
Question by:Infamus
  • 6
  • 4
10 Comments
 
LVL 36

Expert Comment

by:ArneLovius
ID: 39633103
Does the Polycom have a public IP, or is it behind NAT ?
0
 
LVL 12

Author Comment

by:Infamus
ID: 39634139
It has public IP assigned by the firewall and NAT'ed.
0
 
LVL 36

Expert Comment

by:ArneLovius
ID: 39634285
From what you have said, I would take it that the device has a private IP and there is a public IP address that is used for NAT on the firewall, or you could mean that you are NATting from public addresses to public addresses...

Is the call from the address configured on the unit, or from the address on the firewall ?
0
 
LVL 12

Author Comment

by:Infamus
ID: 39634295
It's just basic NAT'ing.

Those devices only has LAN IP addresses.

The NAT is handled by the firewall.

Outside -> Public IP -> Firewall -> NAT to LAN IP ->Polycom
0
 
LVL 36

Expert Comment

by:ArneLovius
ID: 39634338
So if the call is from the public address, the call is not from itself, if it was calling itself, the call would be from it's LAN address...

I presume from your original post that you have more than one Polycom. As a guess, I would suggest that either your firewall does not have spoofing/hairpinning protection, or it is turned off, and more than one Polycom is configured with the same exit IP address on the firewall, and the call is from a different device.

What happens if you try to answer the call ?
0
Enabling OSINT in Activity Based Intelligence

Activity based intelligence (ABI) requires access to all available sources of data. Recorded Future allows analysts to observe structured data on the open, deep, and dark web.

 
LVL 12

Author Comment

by:Infamus
ID: 39634386
All the polycom has different exit IP address and nothing happens if I answer the call.

I check the firewall and there was no traffic to the polycom when it was happening.

I don't really know about the polycom since I only manage my network and this has brought up to me by our video guy.
0
 
LVL 12

Author Comment

by:Infamus
ID: 39634389
When the call comes in, it displays it's own public IP address.
0
 
LVL 36

Accepted Solution

by:
ArneLovius earned 500 total points
ID: 39634434
I don't follow you, either it has a private address, in which case the address you are seeing is NOT it's address, or it has a public address.

If you want to rule out the network/another device, configure the switch port it connects to as a span/monitor port and run a packet capture using Wireshark...
0
 
LVL 12

Author Comment

by:Infamus
ID: 39634597
I was hoping someone with Polycom experience since I don't think this is related to the network at all.  I've searched for this on Google and one of the recommendation was to upgrade firmware but I was hoping to get a walkaround from here.

Thanks for your help though.

Assigned points but not as a solution.
0
 
LVL 12

Author Comment

by:Infamus
ID: 39634600
I've requested that this question be closed as follows:

Accepted answer: 0 points for Infamus's comment #a39634597
Assisted answer: 250 points for ArneLovius's comment #a39634434

for the following reason:

I was hoping someone with Polycom experience since I don't think this is related to the network at all.  I've searched for this on Google and one of the recommendation was to upgrade firmware but I was hoping to get a walkaround from here.

Thanks for your help though.

Assigned points but not as a solution.
0

Featured Post

Highfive Gives IT Their Time Back

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

Join & Write a Comment

Almost all Internet protocol telephones have built-in switches at the back that allow you to connect your personal computer to one port and use the other port to connect your phone to to a Cisco switch.   Why we need to connect the PC to the pho…
Let’s list some of the technologies that enable smooth teleworking. 
Sending a Secure fax is easy with eFax Corporate (http://www.enterprise.efax.com). First, Just open a new email message.  In the To field, type your recipient's fax number @efaxsend.com. You can even send a secure international fax — just include t…
Internet Business Fax to Email Made Easy - With eFax Corporate (http://www.enterprise.efax.com), you'll receive a dedicated online fax number, which is used the same way as a typical analog fax number. You'll receive secure faxes in your email, fr…

757 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

19 Experts available now in Live!

Get 1:1 Help Now