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Polycom making SIP calls to itself

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
Infamus
Asked:
Infamus
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1 Solution
 
ArneLoviusCommented:
Does the Polycom have a public IP, or is it behind NAT ?
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InfamusAuthor Commented:
It has public IP assigned by the firewall and NAT'ed.
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ArneLoviusCommented:
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 ?
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InfamusAuthor Commented:
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
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ArneLoviusCommented:
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 ?
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InfamusAuthor Commented:
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.
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InfamusAuthor Commented:
When the call comes in, it displays it's own public IP address.
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ArneLoviusCommented:
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...
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InfamusAuthor Commented:
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.
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InfamusAuthor Commented:
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.
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