Gx Interface Support
Rel. 6 Gx Interface ▀
Cisco ASR 5x00 Packet Data Network Gateway Administration Guide ▄
277
Step
Description
3
Session manager sends IMS authorization request to IMS Authorization service (IMSA).
4
IMSA creates a session with the CRF on the basis of CRF configuration.
5
IMSA sends request to DPCA module to issue the authorization request to selected CRF.
6
DPCA sends a CCR-initial message to the selected CRF. This message includes the IP address allocated to MN.
7
CCA message sent to DPCA. If a preconfigured rule set for the PDP context is provided in CRF, it sends that charging
rules to DPCA in CCA message.
8
DPCA module calls the callback function registered with it by IMSA.
9
After processing the charging rules, IMSA sends Policy Authorization Complete message to session manager.
10
The rules received in CCA message are used for dynamic rule configuration structure and session manager sends the
message to ECS.
11
ECS installs the rules and performs credit authorization by sending CCR-Initial to Online Charging System (OCS) with
CC-Request-Type set to INITIAL_REQUEST to open the credit control session. This request includes the active rule base
ID and 3GPP specific attributes (for example, APN, QoS and so on).
12
OCS returns a CCA-Initial message to activate the statically configured rulebase and includes preemptive credit quotas.
13
ECS responds to session manager with the response message for dynamic rule configuration.
14
On the basis of response for the PDP context authorization, Session Manager sends the response to the MN and
activates/rejects the call.
Configuring Rel. 6 Gx Interface
To configure Rel. 6 Gx interface functionality:
Step 1
Configure the IMS Authorization Service at the context level for an IMS subscriber in GPRS/UMTS network as
described in the
Configuring IMS Authorization Service at Context Level
section.
Step 2
Verify your configuration, as described in the
Verifying IMS Authorization Service Configuration
section.
Step 3
Configure an APN within the same context to use the IMS Authorization service for an IMS subscriber as described in
the
Applying IMS Authorization Service to an APN
section.
Step 4
Verify your configuration as described in the
Verifying Subscriber Configuration
section.
Step 5
Save your configuration to flash memory, an external memory device, and/or a network location using the Exec mode
command
save configuration
. For additional information on how to verify and save configuration files, refer to the
System Administration Guide
and the
Command Line Interface Reference
.
Important:
Commands used in the configuration examples in this section provide base functionality to
the extent that the most common or likely commands and/or keyword options are presented. In many cases,
other optional commands and/or keyword options are available. Refer to the
Command Line Interface
Reference
for complete information regarding all commands.
