Cisco Cisco Packet Data Interworking Function (PDIF)
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GGSN Changes in Release 17
▀ GGSN Changes in Release 17.0
▄ Release Change Reference, StarOS Release 17
190
CSCum51838 - GGSN Support for PCSCF Discovery
Feature Changes
GGSN Support for PCSCF Discovery
<description>
Previous Behavior: The Existing code for GGSN supported P-CSCF address discovery based on only the IMSA based
table lookup. The other P-CSCF discovery mechanisms like DNS query are not supported.
table lookup. The other P-CSCF discovery mechanisms like DNS query are not supported.
New Behavior: To ensure parity between PGW and GGSN, implementation for deriving P-CSCF addresses from the
various interfaces/local configuration has been done. Following is the desired order of sequence in which P-CSCF
address is to be fetched and returned:
various interfaces/local configuration has been done. Following is the desired order of sequence in which P-CSCF
address is to be fetched and returned:
P-CSCF info from S6b FQDN based DNS query
P-CSCF info from Config FQDN based DNS query
P-CSCF info from IMSA configured table
P-CSCF info from APN config
P-CSCF Discovery would be performed inline with respect to the Call establishment Handoff Procedure and could refer
to the stored FQDN information. In addition to the above enhancements, following points have also been supported:
to the stored FQDN information. In addition to the above enhancements, following points have also been supported:
Storing of discovered P-CSCF IPv4 and IPv6 addresses
SR/ICSR Recovery of P-CSCF IP addresses
Persistence of FQDN information
Persistence of P-CSCF values across gngp handoff
Unification of the P-CSCF Address Element
CSCum56817 - Use of well-known APN for Customer-specific 4G subs
Feature Changes
Use of Well-known APN for 4G Subscribers
This feature is supported through virtual APN feature.
CSCum66168 - DHCPv6: IPv6 default pregfix AAA and Delegated Prefix
Corelation
Feature Changes
AAA and Prefix Delegation DHCP Correlation