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Back to New Best Practices in VoLTE Release
Back to Configuring SBC for IMS
Back to Configuring SBC as Access SBC with External P-CSCF Co-located with ATCF and EATF
Overview
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| Transparency_Profile_Note |
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| Transparency_Profile_Note |
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At a high level, the functions performed by the EATF are:
- The EATF provides IMS-based mechanisms for enabling service continuity of IMS emergency sessions. It is a function in the serving (visited if roaming) IMS network, which provides the procedures for IMS emergency session anchoring and PS to CS Access Transfer.
- The EATF acts as a routing B2BUA, which invokes third party call control (3pcc) to enable access transfer.
- The EATF performs the session continuity when the access transfer request indicated by the E-STN-SR is received.
Deployment Scenario
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0 | Figure |
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1 | SBC IMS Deployment - A-SBC as EATF Provisioning |
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Call Flow Caption |
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he call flow description for Figure 2is as follows:
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- A-SBC and EATF, receives INVITE request from UE.
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- The SBC forwards the INVITE to the same P-CSCF
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- to whom the original REGISTER is sent.
- The P-CSCF forwards to the E-CSCF.
- The E-CSCF invokes the EATF so that the call is anchored for a future handover. The E-CSCF adds two Route headers – one pointing to EATF and another pointing itself (E-CSCF).
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- The EATF deletes the top route header pointing to itself and anchors the emergency session.
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- The EATF loops back the call towards the E-CSCF based on the top route header (that points E-CSCF) from the remaining route header list.
- The E-CSCF forwards it to the PSAP.
In the remaining steps, the 200 OK SIP response is forwarded as appropriate.
Configuration
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| global_configuration_ecscf |
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| global_configuration_ecscf |
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Global Configuration Anchor |
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| ATCF Configuration_eatf |
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| ATCF Configuration_eatf |
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EATF Configuration...
set global signaling srvcc eStnSr +1-237-555-5555 callLingerTimer 32
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set addressContext default zone ZONE_CORENW srvcc eatf enabled
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set addressContext default zone ZONE_CORENW dialogTransparency disabled
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set addressContext default zone ZONE_CORENW disableZoneLevelLoopDetection enabled |
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| Emergency Profile Configuration |
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| Emergency Profile Configuration |
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Emergency Profile Configuration...
set profiles services sipResourcePriorityHeaderProfile "RPH-1" rphEmergencyMatchingConfig "esnet" "1"
commit
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set profiles services sipResourcePriorityHeaderProfile "RPH-1" sendEgressRphForEmergency esnet 1
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set profiles services emergencyCallProfile "EMG-ECSCF" resPriorityHeaderProfile "RPH-1" sosInContactOfRegister "enable"
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set profiles services emergencyCallProfile EMG-ECSCF prefix 911
comm
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set profiles services emergencyCallProfile EMG-ECSCF urnPrefix service:sos.fire
comm
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set profiles services emergencyCallProfile EMG-ECSCF sosInContactOfRegister enable
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| Trunk Group Towards E-CSCF |
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| Trunk Group Towards E-CSCF |
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Trunk Group Towards E-CSCF...
set addressContext default zone ZONE_ECSCF sipTrunkGroup TG_TOWARDS_ECSCF signaling registration requireRegistration required-nonpriority useRUriForRegisterRouting enabled
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set addressContext default zone ZONE_ECSCF sipTrunkGroup TG_TOWARDS_ECSCF signaling prefRequireTransparency "enabled" deRegParentWithChildDereg "enabled" validateAor "enabled" condIncMethInAllowHdr "enabled" usePsxRouteForEmergencyCall "enabled"
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set addressContext default zone ZONE_ECSCF sipTrunkGroup TG_TOWARDS_ECSCF callRouting useRouteSet rcbNextHopAndStored
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set profiles signaling ipSignalingProfile IPSP_PCSCF egressIpAttributes privacy transparency enable
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set addressContext default zone ZONE_ECSCF sipTrunkGroup TG_TOWARDS_ECSCF services emergencyCallProfile EMG-ECSCF |
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| Precondition Support_eatf |
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| Precondition Support_eatf |
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Precondition Support...
set addressContext default zone ZONE_CORENW sipTrunkGroup TG_TOWARDS_IMSCORE services preconditions transparent
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set addressContext default zone ZONE_ECSCF sipTrunkGroup TG_TOWARDS_ECSCF services preconditions transparent
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| Attaching EATF Profile to IPSP |
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| Attaching EATF Profile to IPSP |
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Attaching EATF Profile to IPSPSelect "EATF" profile from the "Access Transfer Policy Type" option.
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0 | Figure |
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1 | Selecting EATF Profile |
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Attach the "EATF" profile to the Ip signaling profile of a Trunk Group.
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0 | Figure |
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1 | Attaching EATF profile to the IPSP Trunk group |
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Anchor |
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| Configuring SBC Towards E-CSCF |
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| Configuring SBC Towards E-CSCF |
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Configuring SBC Towards E-CSCFThe following profiles are configured:
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| Transparency profile_eatf |
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| Transparency profile_eatf |
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Transparency Profile...
set profiles services transparencyProfile TRANS_PROF_ECSCF sipHeader To
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipHeader From
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipHeader Path
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipHeader Accept
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipHeader Reason
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipHeader Server
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipHeader Warning
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipHeader Call-Info
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipHeader Alert-Info
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipHeader Error-Info
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipHeader User-Agent
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipHeader |
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Referred-By excludedMethods register,subscribe,info,publish,message,options,update,bye
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipHeader Request-URI
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipHeader Accept-Language
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipHeader P-Called-Party-Id
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipHeader Require
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipHeader Proxy-Require
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipHeader Security-Client
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipHeader Security-Verify
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipMessageBody application/pidf+xml excludedMethods |
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register,invite,subscribe,info,publish,message,options,update,bye
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipMessageBody application/pidf+xml
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipMessageBody application/rlmi+xml
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipMessageBody message/external-body
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipMessageBody application/pidf+xml
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipMessageBody application/cpim-pidf+xml
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipMessageBody application/pidf-diff+xml
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipMessageBody application/dialog-info+xml
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipMessageBody application/simple-filter+xml
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipMessageBody application/resource-lists+xml
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipMessageBody application/conference-info+xml
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set profiles services transparencyProfile TRANS_PROF_ECSCF sipMessageBody application/simple-message-summary
commit
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set profiles services transparencyProfile TRANS_PROF_ECSCF state enabled
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set addressContext default zone ZONE_ECSCF sipTrunkGroup TG_TOWARDS_ECSCF services transparencyProfile TRANS_PROF_ECSCF
commit |
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| Zone Index Profile_ecscf |
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| Zone Index Profile_ecscf |
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Zone Index ProfileThe following fields must be configured:
- Zone Index Profile
- Description
- Zone Index
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0 | Figure |
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1 | PSX IPSP Zone Index Profile |
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Anchor |
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| Ip Signaling Profile_ecscf |
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| Ip Signaling Profile_ecscf |
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Ip Signaling Profile Anchor |
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| Common Ip Attributes_ecscf |
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| Common Ip Attributes_ecscf |
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Common Ip AttributesThe following "Common IP Attributes" must be enabled in PSX under "IP SIGNALING PROFILE":
- Disable Host Translation
- End to End BYE
- End to End RE-INVITE
- End to End UPDATE
- End to End PRACK
- Insert Peer Address As Top Route Header
- No Port Number 5060
- ReQuery PSX on REGISTER Refresh
- Store P-Charging-Vector
- Validate Access Nw Info Header
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0 | Figure |
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1 | PSX IPSP Common Ip Attributes |
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Image Modified |
Anchor |
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| Relay Flags_ecscf |
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| Relay Flags_ecscf |
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Relay Flags
The following "Relay Flags" must be enabled under "Ip Signaling profile":
- Conference Event Package
- Dialog Event Package
- Info
- Message
- Options
- PUBLISH
- REFER
- Reg Event Package
- Status Code 4XX-6XX
- Select Reject the REFER request if no match is found from Refer To Header Relay option.
Caption |
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0 | Figure |
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1 | PSX IPSP Common Ip Attributes Relay Flags |
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Anchor |
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| Transparency Flags_ecscf |
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| Transparency Flags_ecscf |
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Transparency FlagsThe following "Transparency Flag" must be enabled under "Ip Signaling Profile":
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0 | Figure |
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1 | PSX IPSP Common Ip Attributes Transparency Flags |
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Image Modified |
Anchor |
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| Egress Ip Attributes_ecscf |
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| Egress Ip Attributes_ecscf |
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Egress Ip Attributes
The following "Egress IP Attributes" must be enabled:
- Select SIP Only from IP Protocol Type.
- Disable 2806 Compliance (under Flags)
- Transit PAI From Unregistered Peer (under Flags)
- Add Loop Back Route Header (under Flags)
- Select Include npdi from NPDI Options (under Number Portability Attributes option).
- Select P-Preferred-ID from Privacy Information (under Privacy option).
- Merge Received Contacts with Existing Contacts (under Redirect)
- Select Include None from Include Charge Information option (under SIP Headers and Parameters)
- Select Original Called Number (OCN) from SIP TO Header Mapping option (under SIP Headers and Parameters)
- Include CPC Information (under SIP Headers and Parameters > Flags)
- Transparency For Destination Trunk Group Parameter (under SIP Headers and Parameters > Flags)
- End To End Ack (under SIP Headers and Parameters > Flags)
- Diversion (under SIP Headers and Parameters > Call Forwarding)
- Select Retry Without ETS from the Action For ETS 400 Responses With 417 Reason Code drop-down box (under SIP RPH ETS)
- Set ETS Default Priority Value as 0 (under SIP RPH ETS)
Caption |
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0 | Figure |
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1 | PSX IPSP Common Ip Attributes Egress Ip Attributes |
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Image Modified |
Anchor |
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| Ingress Ip Attributes_ecscf |
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| Ingress Ip Attributes_ecscf |
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Ingress Ip Attributes
The following "Ingress IP Attributes" must be enabled:
- 181 Supported (under Flags option)
Caption |
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0 | Figure |
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1 | PSX IPSP Common Ip Attributes Ingress Ip Attributes |
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Image Modified |
Anchor |
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| Sip Trunk Group_ecscf |
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| Sip Trunk Group_ecscf |
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Sip Trunk GroupThe following profiles/fields must be enabled:
- Zone Index Profile
- IP Signaling Profile
- Feature Control Profile
- Signaling Profile
- SIP Domain
- IP Version Preference
- Use IPTG Routing (Hop By Hop Routing) For Ingress (Ingress > Flags)
- Do Not Use For Fallback Bearer Capability (Egress > Flags)
- IP Peer Supported (Egress > IPTG)
- Egress IP Signaling Profile (Egress > IPTG)
- Select Traffic Management Options from Trunk Group Reserved Level 1 and Trunk Group Reserved Level 2.
- Select Services as Not Screened.
Caption |
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0 | Figure |
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1 | PSX IPSP Sip Trunk Group towards E-CSCF |
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Image Modified |
Anchor |
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| Configuring SBC Towards MSC_ecscf |
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| Configuring SBC Towards MSC_ecscf |
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Configuring SBC Towards MSCFor configuring SBC towards MSC, refer to Configuring SBC Towards MSC.
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