Cisco Cisco Packet Data Gateway (PDG)
PDIF Service Configuration Mode Commands
duplicate-session-detection ▀
Command Line Interface Reference, StarOS Release 17 ▄
7813
duplicate-session-detection
Configures the PDIF to detect duplicate call sessions using old IMSI or NAI addresses and clear old call information.
Product
PDIF
Privilege
Security Administrator, Administrator
Mode
Exec > Global Configuration > Context Configuration > PDIF Service Configuration
configure > context context_name > pdif-service service_name
Entering the above command sequence results in the following prompt:
[context_name]host_name(config-pdif-service)#
Syntax
[ no | default ] duplicate-session-detection { imsi-based | nai-based }
no
Stops duplicate session detection.
default
Configures the default setting, which is NAI-based detection.
imsi-based
Configures the PDIF to detect duplicate call sessions based on the IMSI address.
nai-based
Configures the PDIF to detect duplicate call sessions based on the NAI address. This is the default setting.
Usage
If an MS leaves the Wi-Fi coverage area and subsequently comes back online, it may initiate a new session
setup procedure. After both the device authentication with HSS and the subscriber authentication with AAA
server are completed, PDIF runs the internal mechanism to see whether there was any other session bound
with the same IMSI. If an old session is detected, PDIF starts clearing this old session by sending a proxy-
MIP Deregistration request to the HA. PDIF resumes new session setup by sending a proxy-MIP registration
request. When the old session is aborted, PDIF sends Diameter STR messages and RADIUS Acct STOP
messages to corresponding AAA servers.
PDIF allows duplicate session detection based on either the NAI or IMSI addresses. When detecting based on
NAI, it is the first-phase (device authentication) NAI that is used.
setup procedure. After both the device authentication with HSS and the subscriber authentication with AAA
server are completed, PDIF runs the internal mechanism to see whether there was any other session bound
with the same IMSI. If an old session is detected, PDIF starts clearing this old session by sending a proxy-
MIP Deregistration request to the HA. PDIF resumes new session setup by sending a proxy-MIP registration
request. When the old session is aborted, PDIF sends Diameter STR messages and RADIUS Acct STOP
messages to corresponding AAA servers.
PDIF allows duplicate session detection based on either the NAI or IMSI addresses. When detecting based on
NAI, it is the first-phase (device authentication) NAI that is used.
Example
The following command configures duplicate session detection to use IMSI addressing:
duplicate-session-detection imsi