AudioCodes Mediant 4000 SBC User Manual page 475

CHAPTER 20 SIP Definitions
Parameter
'UDP Port Assignment'
udp-port-assignment
[Account_UDPPortAssignment]
Description
The Served IP Group's connectivity status is determ-
ined by the keep-alive mechanism of its associated
Proxy Set (i.e., the 'Proxy Keep-Alive' parameter is con-
figured to Using OPTIONS).
Enables the device to dynamically allocate local SIP UDP
ports to Accounts using the same Serving IP Group, where
each Account is assigned a unique port on the device's leg
interfacing with the Accounts' Serving IP Group.
■ [0] Disable = (Default) The device uses the same
specific UDP port for all registrations done for this
Account (traffic between the device and the Serving IP
Group). This port is the one configured for the SIP
Interface ('UDP Port' parameter - SIPInterface_
UDPPort) that is associated with the Proxy Set of the
Account's Serving IP Group.
■ [1] Enable = The device assigns a unique local port for
each Account for which the device initiates registration.
The port is taken from a configured UDP port range.
The port range is configured for the SIP Interface
('Additional UDP Ports' parameter - SIPInterface_
AdditionalUDPPorts) associated with the Proxy Set of
the Account's Serving IP Group. Traffic between the
Serving IP Group and device is sent from and received
on the assigned unique local port. If enabled for other
Accounts that are configured with the same Serving IP
Group, each Account is allocated a unique UDP port
from the port range. For example, if you have configured
two Accounts, "PBX-1" and "PBX-2", the device could
assign port 6000 to "PBX-1" and 6100 to "PBX-2".
Note:
■ If you enable the parameter, you must also enable the
device to initiate registration for the Account (i.e.,
configure the 'Register' parameter to any value other
than No).
■ If the device fails to allocate a port (e.g., insufficient
ports), the device does not send the SIP REGISTER
request, but tries again within a period configured by the
RegistrationRetryTime and
MaxRegistrationBackoffTime parameters.
■ If the device receives a SIP request from the Serving IP
Group for the Account, on a port that was not assigned
to the Account, it rejects the request (with a SIP 404
Not Found response).
■ If the device receives a SIP request from the Served IP
Group and the Account has not been allocated a valid
port, the device rejects the request (with a SIP 500
Server Internal Error response).
■ For more information on configuring the SIP Interface's
port range, see Configuring SIP Interfaces
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Mediant 4000 SBC | User's Manual
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