Cisco Cisco Packet Data Gateway (PDG) Guia De Resolução De Problemas
Session Control Manager Overview
▀ Product Description
▄ Cisco ASR 5000 Series Session Control Manager Administration Guide
OL-22952-01
Interrogating-CSCF
The I-CSCF performs mostly as a load distribution device. The I-CSCF queries the Home Subscriber Server (HSS) to
identify the appropriate Serving-CSCF (S-CSCF) to which the call is sent. Since the HSS maintains user profile
information (much like the Home Location Register (HLR) in the Public Land Mobile Network (PLMN)), the I-CSCF
can identify the proper S-CSCF for the call. The I-CSCF may also query a AAA server to determine subscriber profile
information using DIAMETER.
identify the appropriate Serving-CSCF (S-CSCF) to which the call is sent. Since the HSS maintains user profile
information (much like the Home Location Register (HLR) in the Public Land Mobile Network (PLMN)), the I-CSCF
can identify the proper S-CSCF for the call. The I-CSCF may also query a AAA server to determine subscriber profile
information using DIAMETER.
I
MPORTANT
:
The I-CSCF is incorporated into the S-CSCF.
I-CSCF Interfaces
The following diagram shows the interfaces/reference points associated with the I-CSCF:
E N U M
S e rv e r
S -C S C F
P -C S C F
H S S
I-C S C F
T ra n s it
F u n c tio n s
C D F
C x
M w
E N U M
R f
S IP
Serving-CSCF
The Serving-CSCF (S-CSCF) is the access point to services provided to the subscriber. Service examples include
session control services, such as call features.
session control services, such as call features.
Other services include:
VPN
Centralized speed dialing lists
Charging
The S-CSCF also interacts with the HSS for:
User authentication
Emergency registration
Location management
User data handling
A Breakout Gateway Control Function is integrated into the SCM’s S-CSCF to support PSTN calls.