Cisco series C - Open Ports TCP 4043 & 4044
Anyone can respond to what these ports do on C-Series codecs?
They are generally used for the nearby identity resolution protocol and Protocol location tracking and known to be used by malicious software. Are they used for these protocols, can they be closed without loss of functionality. I have a client who has many systems placed on public networks and they wonder if this can be / should be done
I looked in the paper without finding the answer:
Any ideas?
MW
How are Mattias Hei, you?
The firewall vcs guide here helps you.
If I see just the tcp ports 4043 and 4044 are used for business communication (cisco contact 8) & upgrades.
If no malware :-)
You can be sure that you can close it from external networks. An intouch would most likely be
plugged into the secondary port or the LAN in all cases.
I do it vice versa, all close and open just need ssh and http (s) of networks including access management
and allow only necessary media ports and signage from the outside.
You will find that the media ports used TC5.1 ports in the Administrator's guide
Value space:
Dynamic: The system will allocate which ports to use when opening a TCP connection. The reason for doing this is to avoid using the same ports for subsequent calls, as some firewalls consider this as a sign of attack. When Dynamic is selected, the H.323 ports used are from 11000 to 20999. Once 20999 is reached they restart again at 11000. For RTP and RTCP media data, the system is using UDP ports in the range 2326 to 2487. Each media channel
is using two adjacent ports, ie 2330 and 2331 for RTP and RTCP respectively. The ports are automatically selected by the system within the given range. Firewall administrators should not try to deduce which ports are used when, as the allocation schema within the mentioned range may change without any further notice.
Static: When set to Static the ports are given within a static predefined range [5555-6555].
Tags: Cisco Support
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