CHAPTER25 Routing SBC
Mediant 4000 SBC | User's Manual
For each IP PBX, the device sends SIP messages to the proxy server using the specific local,
UDP port on the leg interfacing with the proxy server. For SIP messages received from the proxy
server, the device routes the messages to the appropriate IP PBX according to the local UDP port
on which the message was received. On the leg interfacing with the IP PBXs, the device uses the
same local UDP port (e.g., 5060) for all IP PBXs (send and receive).
To configure this feature, you need to configure the SIP Interface of the proxy server with a special
UDP port range, and use tag-based routing with Call Setup Rules to specify the exact UDP port
you want assigned to each SIP entity (IP PBX), from the SIP Interface port range. The following
procedure describes how to configure the device to use a specific local UDP port per SIP entity on
the leg interfacing with a proxy server that is common to all the SIP entities. To facilitate
understanding, the procedure is based on the previous example.
➢ To configure specific UDP ports for SIP entities communicating with common proxy
server:
1. Open the SIP Interfaces table (see Configuring SIP Interfaces), and then configure the
following SIP Interfaces:
● SIP Interface for leg interfacing with IP PBXs (local UDP port 5060 is used):
General
Index 1
Name PBX
Network Interface WAN
UDP Port 5060
● SIP Interface for leg interfacing with proxy server (specific local UDP ports are later taken
from this port range):
General
Index 2
Name ITSP
Network Interface LAN
UDP Port 5060
Additional UDP Ports 6000-7000
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