To configure the emergency calls for the roaming users in the S8HR model, the home and visited network for the UE must be configured.
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| Configuring Home Network |
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| Configuring Home Network |
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Configuring Home Network
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| Configuring SBC as P-CSCF |
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| Configuring SBC as P-CSCF |
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Configuring SBC as P-CSCF
For detailed information, refer to Configuring SBC as P-CSCF.
Configuring HPLMN and VPLMN Profiles
Execute the following command to configure the HPLMN profile:
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% set profiles services hplmnProfile IND_PLMN_PROF hplmnId 40471 |
Execute the following command to configure the VPLMN profile:
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% set profiles services vplmnProfile US_PLMN_PROF vplmnId 310010 emergencyPrefix 911 |
Execute the following command to attach the hplmnProfile vplmnProfile
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% set addressContext default zone defaultSigZone sipTrunkGroup TG1 services hplmnProfile IND_PLMN_PROF |
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% set addressContext default zone defaultSigZone sipTrunkGroup TG1 services vplmnProfile US_PLMN_PROF |
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| Configuring the S8HR Support Flag |
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| Configuring the S8HR Support Flag |
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Configuring the S8HR Support Flag
Execute the following command to support the emergency call in S8HR model:
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% set addressContext default zone defaultSigZone sipTrunkGroup TG1 signaling s8hrSupport enabled |
When S8HR processing flag is enabled, the SBC triggers PCRF based VPLMN ID retrieval procedures. The SBC subscribes for the PLMN changes at the time of registration of the UE and supports subscribing IP CAN, RAT and PLMN-ID types to the PCRF registrations.
- If the
S8HR flag is enabled and signalingPathflag is disabled, the P-CSCF subscribes only for the PLMN ID change notification. - If
signalingPath flag is enabled along with S8HRflag, the P-CSCF subscribes for the PLMN-ID, RAT, and IP-CAN type in the same AAR.
The SBC indicates that the PLMN info is supported to the PCRF by setting the "PLMNInfo" (bit 19) of the "Feature-List" AVP in the Supported-Features-AVP in the AAR message. The SBC stores the VPLMN ID in the RCB when it receives the AAA or RAR with Specific-Action-AVP set to PLMN_CHANGE in case of PCRF based VPLMN ID information. The PLMN ID is fetched from the 3GPP-SGSN-MCC-MNC AVP. The SBC checks the MCC and MNC values received from the PCRF with the list of configured HPLMN and VPLMN values.
- If the value matches with the HPLMN, the UE is a home, or RAVEL, or S8HR inbound user.
- If the value matches with the VPLMN, the UE is an S8HR outbound user.
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| Configuring PSX Query with Domain Name and PLMN ID |
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| Configuring PSX Query with Domain Name and PLMN ID |
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Configuring PSX Query with Domain Name and PLMN ID
In case of Home/RAVEL/S8HR inbound roamers, the roaming status is decided by the PSX based on the domain name of the UE's home network. In case of S8HR outbound roamers, the SBC decides it and sends the query to the PSX with the PLMN information. The PSX matches the PLMN ID with the list of VPLMNs and sends emergency call treatment mechanism to the SBC.
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| NULL Encryption Support |
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| NULL Encryption Support |
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NULL Encryption Support
When the flag Do not create security association is enabled in the PSX, the SBC does not create any security association and the SBC implements NULL encryption towards UE and use only RTP for media. Irrespective of the encryption preference configured and SRTP enabled on the SBC, the SBC must implement NULL encryption forS8HR outbound user and use only RTP for media.
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| Configuring Visited Network |
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| Configuring Visited Network |
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Configuring Visited Network
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| Configuring SBC as P-CSCF_VN |
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| Configuring SBC as P-CSCF_VN |
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Configuring SBC as P-CSCF
For detailed information, refer to Configuring SBC as P-CSCF.
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| Configuring GIBA Support for Inbound User |
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| Configuring GIBA Support for Inbound User |
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Configuring GIBA Support for Inbound User
Execute the following command to configure GIBA support for inbound user:
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% set addressContext default zone defaultSigZone sipTrunkGroup TG1 signaling gibaSupportForS8hrInboundUser enabled |
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| Configuring Roaming Type in External PSX |
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| Configuring Roaming Type in External PSX |
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Configuring Roaming Type in External PSX
To differentiate between RAVEL and S8HR inbound user, the option Roaming Type is added to the Carrier Domain.
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