AudioCodes Mediant 4000 SBC, User Manual

Page: 396 / 1037

CHAPTER 18 Core Entities
Mediant 4000 SBC | User's Manual
Parameter Description
✔
If you modify the Proxy Set.
✔
If the Proxy Set is configured with an FQDN and
a DNS resolution refresh removes the IP
address to which the user is bound.
✔
User registration expires or the user initiates an
unregister request.
■ The Proxy Set's Hot-Swap feature (for proxy
redundancy) is not supported for users that are
already bound to a registrar. However, you can
achieve proxy "hot-swap" for failed initial (non-
bounded) REGISTER requests. If a failure response
is received for the initial REGISTER request and the
response’s code appears in the Alternative Routing
Reasons table (see
Configuring SIP Response
Codes for Alternative Routing Reasons ), "hot-swap"
to the other IP addresses of the Proxy Set is done
until a success response is received from one of the
addresses. In the case of failed REGISTER refresh
requests from users that are already bound to a
registrar, no "hot-swap" occurs for that request; only
for subsequent refresh requests.
■ When using the User Information table (see SBC
User Information for SBC User Database ), registrar
"stickiness" is supported only when the user initiates
the REGISTER request. Therefore, you must
configure the 'Registration Mode' parameter of the IP
Group (User-type) to which the user belongs, to User
Initiates Registration.
■ This feature is also supported when the device
operates in HA mode; registrar "stickiness" is
retained even after an HA switchover.
'User UDP Port Assignment'
user-udp-port-assignment
[IPGroup_
UserUDPPortAssignment]
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.
- 363 -