AudioCodes Mediant 1000 User Manual page 1161

User's Manual
Parameter
SBC User Registration Time
configure voip > sbc settings > sbc-
usr-rgstr-time
[SBCUserRegistrationTime]
SBC Proxy Registration Time
configure voip > sbc settings > sbc-
prxy-rgstr-time
[SBCProxyRegistrationTime]
configure voip > sbc settings > sbc-
rand-expire
[SBCRandomizeExpires]
Version 7.2
challenge message.
Global parameter that defines the duration (in seconds) of the
periodic registrations that occur between the user and the
device (the device responds with this value to the user). You
can also configure this functionality per specific calls, using IP
Profiles (IpProfile_SBCUserRegistrationTime). For a detailed
description of the parameter and for configuring this
functionality in the IP Profiles table, see ''Configuring IP
Profiles'' on page 393.
Note: If this functionality is configured for a specific IP Profile,
the settings of this global parameter is ignored for calls
associated with the IP Profile.
Defines the duration (in seconds) for which the user is
registered in the proxy database (after the device forwards the
REGISTER message). This value is sent in the Expires
header. When set to 0, the device sends the Expires header's
value as received from the user to the proxy.
The valid range is 0 to 2,000,000 seconds. The default is 0.
Defines a value (in seconds) that is used to calculate a new
value for the expiry time in the Expires header of SIP 200 OK
responses for user registration and subscription requests from
users.
The expiry time value appears in the Expires header in
REGISTER and SUBSCRIBE SIP messages. When the device
receives such a request from a user, it forwards it to the proxy
or registrar server. Upon a successful registration or
subscription, the server sends a SIP 200 OK response. If the
expiry time was unchanged by the server, the device applies
this feature and changes the expiry time in the SIP 200 OK
response before forwarding it to the user; otherwise, the device
does not change the expiry time.
This feature is useful in scenarios where multiple users may
refresh their registration or subscription simultaneously,
thereby causing the device to handle many such sessions at a
given time. This may result in an overload of the device
(reaching maximum session capacity), thereby preventing the
establishment of new calls or preventing the handling of some
user registration or subscription requests. When this feature is
enabled, the device assigns a random expiry time to each user
registration or subscription and thus, ensuring future user
registration and subscription requests are more distributed
over time (i.e., do not all occur simultaneously).
The device takes any random number between 0 and the
value configured by the parameter, and then subtracts this
random number from the original expiry time value. For
example, assume that the original expiry time is 120 and the
parameter is set to 10. If the device randomly chooses the
number 5 (i.e., between 0 and 10), the resultant expiry time will
be 115 (120 minus 5).
The valid value is 0 to 20. The default is 10. If set to 0, the
device does not change the expiry time.
Note:
1161
62. Configuration Parameters Reference
Description
Mediant 1000B Gateway & E-SBC