AudioCodes Mediant 800B User Manual page 929

User's Manual
Parameter
Web: SBC User Registration Time
CLI: sbc-usr-reg-time
[SBCUserRegistrationTime]
CLI: config-voip>sbc general-
setting sbc-rand-expire
[SBCRandomizeExpires]
Version 6.8
requesting authentication (i.e., validates user by checking
user name and password). This option does not authenticate
the message body (i.e., SDP).

[1] 1 = The device sends 'qop=auth-int' in the SIP response,
indicating required authentication and authentication with
integrity (e.g., checksum). This option restricts the client to
authenticating the entire SIP message, including the body, if
present.

[2] 2 = (Default) The device sends 'qop=auth, auth-int' in the
SIP response, indicating either authentication or integrity.
This enables the client to choose 'auth' or 'auth-int'. If the
client chooses 'auth-int', then the body is included in the
authentication. If the client chooses 'auth', then the body is
not authenticated.

[3] 3 = No 'qop' parameter is offered in the SIP 401
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 this parameter and for configuring this
functionality in the IP Profile table, see ''Configuring IP Profiles''
on page 288.
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 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 this parameter, and then subtracts this random
number from the original expiry time value. For example,
929
54. Configuration Parameters Reference
Description
Mediant 800B Gateway and E-SBC