User's Manual
1218
Document #: LTRT-10375
Mediant 500 MSBR
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:
The lowest expiry time that the device sends in the 200 OK,
regardless of the resultant calculation, is 10 seconds. For example,
if the original expiry time is 12 seconds and the parameter is set to
5, theoretically, the new expiry time can be less than 10 (e.g., 12 – 4
= 8). However, the expiry time will be set to 10.
The expiry time received from the user can be changed by the
device before forwarding it to the proxy. This is configured by the
SBCUserRegistrationTime parameter.
SBC Survivability
Registration Time
configure voip > sbc
settings > sbc-surv-rgstr-
time
[SBCSurvivabilityRegistr
ationTime]
Defines the duration of the periodic registrations between the user and
the device, when the device is in survivability state (i.e., when
REGISTER requests cannot be forwarded to the proxy and are
terminated by the device). When set to 0, the device uses the value set
by the SBCUserRegistrationTime parameter for the device's response.
The valid range is 0 to 2,000,000 seconds. The default is 0.
configure voip >
sbc settings >
sas-notice
[SBCEnableSurvivability
Notice]
Enables the device to notify Aastra IP phones that the device is
currently operating in Survivability mode.
[0]
= Disable
[1]
= Enable
For more information, see Enabling Survivability Display on Aastra IP
Phones on page 739.
SBC Dialog-Info
Interworking
configure voip > sbc
settings > sbc-dialog-
info-interwork
[EnableSBCDialogInfoInt
Enables the interworking of dialog information (parsing of call identifiers
in XML body) in SIP NOTIFY messages received from a remote
application server.
[0]
Disable (default)
[1]
Enable
For more information, see Interworking Dialog Information in SIP
Summary of Contents for Mediant 500 MSBR
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Page 137: ...Part IV General VoIP Configuration ...
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Page 455: ...Part V Gateway Application ...
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Page 757: ...Part IX Maintenance ...
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Page 837: ...Part X Status Performance Monitoring and Reporting ...
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Page 927: ...Part XI Diagnostics ...
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Page 977: ...Part XII Appendix ...
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