User's Manual 376 Document #: LTRT-10532
Mediant 500L Gateway & E-SBC
Parameter Description
User UDP Port
Assignment
user-udp-port-
assignment
[IPGroup_UserUDPPort
Assignment]
Enables the device to assign a unique, local UDP port (for SIP signaling)
per registered user (User-type IP Group) on the leg interfacing with the
proxy server (Server-type IP Group). The port is used for incoming (from
the proxy to the user) and outgoing (from the user to the proxy) SIP
messages. Therefore, the parameter must be enabled for the IP Group of
the proxy server.
[0] Disable = (Default) The device uses the same local UDP port for all
the registered users. This single port is configured for the SIP Interface
('UDP Port' parameter) associated with the Proxy Set of the proxy
server.
[1] Enable = The device assigns each registered user a unique local
port, chosen from a configured UDP port range. The port range is
configured for the SIP Interface ('Additional UDP Ports' parameter)
associated with the proxy server.
The device assigns a unique port upon the first REGISTER request
received from the user. Subsequent SIP messages other than
REGISTER messages (e.g., INVITE) from the user are sent to the proxy
server on this unique local port. The device rejects the SIP request if
there is no available unique port for use (due to the number of
registered users exceeding the configured port range). The same
unique port is also used for registration refreshes. The device de-
allocates the port for registration expiry. For SIP requests from the pr
server, the local port on which they are received is irrelevant (unique
port or any other port); the device does not use this port to identify the
registered user.
Note:
This feature does not apply to SIP requests received from non-
registered users. For these users, the device sends all requests to the
proxy server on the single port configured for the SIP Interface ('UDP
Port' parameter).
This feature is applicable only if the user initiates registration (i.e., user
sends the REGISTER request). In other words, the 'Registration Mode'
parameter of the IP Group of the user must be configured to User
.
Authentication Mode
authentication-mode
[IPGroup_Authenticatio
nMode]
Defines the authentication mode.
[0] User Authenticates = (Default) The device does not handle the
authentication, but simply forwards the authentication messages
between the SIP user agents.
[1] SBC as Client = The device authenticates as a client. It receives the
401/407 response from the proxy requesting for authentication. The
device sends the proxy the authorization credentials (i.e., username and
password) according to one of the following: 1)Account configured in the
Accounts table (only if authenticating Server-type IP Group), 2) global
username and password parameters (only if authenticating Server-type
IP Group), 3) User Information file, or 4) sends request to users
requesting credentials (only if authenticating User-type IP Group). For
more information on Accounts, see Configuring Registration Accounts
on page
395.
[2] SBC as Server = The device acts as an Authentication server:
Authenticates SIP clients, using the usernames and passwords in
the User Information table (see SBC User Information for SBC User
Database on page
812). This is applicable only to User-type IP
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