Appendix B: Network IP Topology
Remote Maintenance and Diagnostics
Inter-Tel
®
5000 Installation Manual – Issue 2.4, May 2008 Page B-19
Remote Maintenance and Diagnostics
These protocols provide capabilities to diagnose problems, update software, etc. To enable
remote maintenance and diagnostics over the Internet, enable the ports for DB Programming
(TCP port 4000), Web interfaces (TCP port 80), SSH (TCP port 22), and AVDAP Monitor (TCP
port 4444).
Internal Session Initiation Protocol (SIP)
The SIP protocol presents some special challenges in that it does not function well when
passing through NAT. In the diagram below, this means that the SIP server cannot communicate
with the internal SIP endpoint. The SIP server must be in the DMZ because its communication
with the Inter-Tel CS-5200/5400/5600 system cannot pass through NAT. The only solution to
this problem is to utilize a SIP-aware firewall that can perform the appropriate adjustments
associated with NAT.
Internet
Internal Endpoint
Dynamic Private IP
`
Admin PC
Dynamic Private IP
External Endpoint
Dynamic Public IP
Inter-Tel CS-5x00
208.132.23.66
UC/SIP Server
208.132.23.67
Enterprise Conferencing
208.132.23.68
E0/0
192.168.100.1/24
E1/0
208.132.23.64/26
S0/0
208.13.17.33/30
Internal LAN
Non-NAT DMZ
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