Cisco Cisco Packet Data Gateway (PDG)
P-GW Changes in Release 17
▀ P-GW Enhancements for 17.0
▄ Release Change Reference, StarOS Release 17
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Previous Behavior: Previously, P-CSCF Recovery was not supported. Discovery support was only available during
the Initial Attach.
the Initial Attach.
New Behavior: P-CSCF Recovery is now supported while a session is on-going.
Customer Impact: The customer will be able to see the number of P-CSCF restoration indications received at the P-
GW Service Level.
GW Service Level.
Performance Indicator Changes
P-GW Schema
The following statistic has been added for tracking the number of occurrences of P-CSCF Restoration Required
Indications received from the MME/S-GW through a modify bearer request:
Indications received from the MME/S-GW through a modify bearer request:
sessstat-pcscf-recovery-count
show pgw-service statistics all
The following field has been added for displaying the number of occurrences of P-CSCF Restoration Required
Indications received from the MME/S-GW through a modify bearer request:
Indications received from the MME/S-GW through a modify bearer request:
P-CSCF Restoration Indications received: <Count at Service Level>
CSCum17490 - EGTPC Support - PGW Support for PCSCF Recovery
Feature Changes
P-GW Support for P-CSCF Recovery
The P-GW can store the P-CSCF FQDN received during the initial registration with the AAA. Upon receiving the P-
CSCF restoration flag from the MME/S-GW, the P-GW performs a new DNS query using the existing P-CSCF FQDN
to provide the updated list of three P-CSCF IP addresses using PCO.
CSCF restoration flag from the MME/S-GW, the P-GW performs a new DNS query using the existing P-CSCF FQDN
to provide the updated list of three P-CSCF IP addresses using PCO.
Customer Impact: Supports spec-based mechanism to support P-CSCF discovery for GTP-based S2b interface for
WiFi integration. This is needed for Voice over WiFi service.
WiFi integration. This is needed for Voice over WiFi service.
CSCum17693 - Rejecting non-emergency 9th network initiated DRB per UE
Feature Changes
P-GW Cause Code Mapping
Confirmed that the MME rejects the creation of more than 8 DRBs without initiating any UE procedures and the P-GW
maps the MME provided GTP cause code to the Gx cause code.
maps the MME provided GTP cause code to the Gx cause code.
Important:
This functionality is only applied to non-emergency calls.