In this section:
Overview
The SBC can be deployed on the Access Edge and Peering Edge in an IMS/VoLTE network. On the Access Edge, the functional roles include: P-CSCF (IMS-AGW), E-CSCF, ATCF (ATGW) and EATF. On the Peering Edge the functional roles include: IBCF (TrGW).
The Proxy Call Session Control Function (P-CSCF) is the first point of contact in an IMS network. It is responsible for security associations towards the UE. At the time of UE registration, it inserts itself into the path so that it is in the signaling path for all subsequent messages. P-CSCF determines whether the UE is roaming or not. For a non-roaming UE that is, a UE in the home network, it forwards the registration messages towards the I-CSCF and directly contacts the S-CSCF for all subsequent messages. For a roaming UE, it selects a peering SBC (that is, IBCF) and forwards the SIP messages (including registration, call-related and non-call-related) towards the same.
IMPORTANT
The Transparency Profile is the recommended method of configuring transparency on the SBC Core for new deployments as well as when applying additional transparency configurations to existing deployments. Do not use IP Signaling Profile flags in these scenarios because the flags will be retired in upcoming releases.
Refer to the SBC SIP Transparency Implementation Guide for additional information.
Deployment Scenario
The following deployment scenario shows the SBC acting as an Access SBC :
SBC IMS Deployment - SBC as Access SBC
Call Flows
Basic Registration Call Flow
Basic Registration Call Flow
The call flow description forFigure 2 is as follows:
- The Ribbon SBC, acting as an A-SBC, receives REGISTER request from UE.
- The SBC processes the REGISTER request. It acts as a B2BUA and changes Contact header to point itself and forwards the REGISTER request towards P-CSCF. The SBC does not insert a Path header as (external) P-CSCF does not expect a Path header from UE.
- The P-CSCF forwards REGISTER towards I/S-CSCF. P/I/S-CSCF responds to the REGISTER with 200 OK.
- The SBC stores the Path and Service-Route headers and forwards these headers transparently towards UE. It also processes, stores, and passes the P-Associated-URI header that is present in the 200 OK.
Originating Call from UE
Originating Call from UE
The call flow description for the Figure 3 is as follows:
- The Ribbon SBC, acting as an A-SBC, receives INVITE request from UE.
- The SBC forwards the INVITE towards the same P-CSCF to whom REGISTER was forwarded based on the local configuration,
- The egress INVITE contains Route headers that point to P-CSCF (which is the next-hop stored in RCB) and Service-Route header(s) received in 200 OK to REGISTER.
- It is noted that The Ribbon SBC does not support to apply default PUI procedures as P-CSCF function is not co-located and instead an external P-CSCF is present.
Configuring SBC Towards UE
Configure the following profiles first:
- Transparency Profile
- Trunk Group Configuration Towards UE
- IPSec Support for SBC with External PCSCF
- Non-register Routing Configuration
- Zone Index Profile
- IP Signaling Profile
IMPORTANT
The Transparency Profile is the recommended method of configuring transparency on the SBC Core for new deployments as well as when applying additional transparency configurations to existing deployments. Do not use IP Signaling Profile flags in these scenarios because the flags will be retired in upcoming releases.
Refer to the SBC SIP Transparency Implementation Guide for additional information.
Transparency Profile
set profiles services transparencyProfile TOWARDS_UE sipHeader To set profiles services transparencyProfile TOWARDS_UE sipHeader From set profiles services transparencyProfile TOWARDS_UE sipHeader Path set profiles services transparencyProfile TOWARDS_UE sipHeader Accept set profiles services transparencyProfile TOWARDS_UE sipHeader Reason set profiles services transparencyProfile TOWARDS_UE sipHeader Server set profiles services transparencyProfile TOWARDS_UE sipHeader Warning set profiles services transparencyProfile TOWARDS_UE sipHeader Call-Info set profiles services transparencyProfile TOWARDS_UE sipHeader Alert-Info set profiles services transparencyProfile TOWARDS_UE sipHeader Error-Info set profiles services transparencyProfile TOWARDS_UE sipHeader User-Agent set profiles services transparencyProfile TOWARDS_UE sipHeader Referred-By excludedMethods register,subscribe,info,publish,message,options,update,bye set profiles services transparencyProfile TOWARDS_UE sipHeader Request-URI set profiles services transparencyProfile TOWARDS_UE sipHeader Accept-Language set profiles services transparencyProfile TOWARDS_UE sipHeader P-Called-Party-Id commit set profiles services transparencyProfile TOWARDS_UE sipMessageBody application/pidf+xml set profiles services transparencyProfile TOWARDS_UE sipMessageBody application/rlmi+xml set profiles services transparencyProfile TOWARDS_UE sipMessageBody message/external-body set profiles services transparencyProfile TOWARDS_UE sipMessageBody application/pidf+xml set profiles services transparencyProfile TOWARDS_UE sipMessageBody application/cpim-pidf+xml set profiles services transparencyProfile TOWARDS_UE sipMessageBody application/pidf-diff+xml set profiles services transparencyProfile TOWARDS_UE sipMessageBody application/dialog-info+xml set profiles services transparencyProfile TOWARDS_UE sipMessageBody application/simple-filter+xml set profiles services transparencyProfile TOWARDS_UE sipMessageBody application/resource-lists+xml set profiles services transparencyProfile TOWARDS_UE sipMessageBody application/conference-info+xml set profiles services transparencyProfile TOWARDS_UE sipMessageBody application/simple-message-summary set profiles services transparencyProfile TOWARDS_UE sipMessageBody application/vnd.3gpp.srvcc-ext ignoreTransparency yes commit set profiles services transparencyProfile TOWARDS_UE state enabled commit set addressContext default zone ZONE_ACCESSNW sipTrunkGroup TG_TOWARDS_UE services transparencyProfile TOWARDS_UE commit
Trunk Group Configuration Towards UE
set addressContext default ipInterfaceGroup LIG1 ipInterface LIF1 ceName SBX30 portName pkt0 ipAddress 10.7.14.125 prefix 16 commit set addressContext default ipInterfaceGroup LIG1 ipInterface LIF1 mode inService state enabled commit set addressContext default zone ZONE_ACCESSNW id 2 sipSigPort 1 state enabled ipAddressV4 10.7.14.126 portNumber 5060 ipInterfaceGroupName LIG1 transportProtocolsAllowed sip-udp,sip-tcp,sip-sctp,sip-tls-tcp commit set addressContext default zone ZONE_ACCESSNW sipTrunkGroup TG_TOWARDS_UE mode inService state enabled media mediaIpInterfaceGroupName LIG1 commit set addressContext default zone ZONE_ACCESSNW sipTrunkGroup TG_TOWARDS_UE ingressIpPrefix 10.70.0.0 16 commit set addressContext default staticRoute 10.70.0.0 16 10.7.1.1 LIG1 LIF1 preference 100 commit set addressContext default staticRoute 10.54.0.0 16 10.7.1.1 LIG1 LIF1 preference 100 commit set addressContext default zone ZONE_ACCESSNW sipTrunkGroup TG_TOWARDS_UE signaling registration requireRegistration required-nonpriority set addressContext default zone ZONE_ACCESSNW sipTrunkGroup TG_TOWARDS_UE callRouting useRouteSet rcbNextHopAndStored set profiles signaling ipSignalingProfile IPSP_PCSCF egressIpAttributes privacy transparency enable commit set addressContext default zone ZONE_ACCESSNW sipTrunkGroup TG_TOWARDS_UE services preconditions transparent commit
IPSec Support for SBC with External P-CSCF
set profiles services sipSecurityProfile IPSEC_SBC sbxSecMode sbc-pcscf set profiles services sipSecurityProfile IPSEC_SBC sipSecurityMechanism ipsec-3gpp precedence 1 commit set addressContext default ipInterfaceGroup LIG1 ipsec enabled commit set addressContext default zone ZONE_ACCESSNW sipTrunkGroup TG_TOWARDS_UE services sipSecurityProfile IPSEC_SBC commit set addressContext default ipsec spd spd1 action bypass localIpAddr 10.54.54.27 localIpPrefixLen 32 localPort 5060 precedence 10 state enabled set addressContext default ipsec spd spd2 action bypass localIpAddr 10.54.54.27 localIpPrefixLen 32 localPort 5061 precedence 11 state enabled commit
Non-register Routing Configuration
set addressContext default zone ZONE_ACCESSNW sipTrunkGroup TG_TOWARDS_UE callRouting useRouteSet rcbNextHopAndStored commit
Zone Index Profile
The following flags must be configured under PSX Zone Index Profile:
- Zone Index Profile
- Description
- Zone Index
Zone Index Profile
IP Signaling Profile
The following parameters should be configured under IP Signaling Profile object:
Common Ip Attributes
The following Common IP Attributes flags must be enabled in PSX under IP SIGNALING PROFILE:
- No Port Number 5060
- Reject REFER
- ReQuery PSX on REGISTER Refresh
- Disable Host Translation
- End to End BYE
- End to End RE-INVITE
- End to End UPDATE
- Store P-Charging-Vector
- Validate Access Nw Info Header
Ip Signaling Profile Common Ip Attributes
Relay Flags
The following Relay Flags must be enabled under Ip Signaling profile:
- Dialog Event Package
- Info
- Options
- Select Reject the REFER request if no match is found from Refer To Header Relay option.
Ip Signaling Profile Relay Flags
Transparency Flags
The following Transparency Flags must be enabled under Ip Signaling profile:
- Contact Header*
Ip Signaling Profile Transparecy Flags
Egress IP Attributes
The following Egress IP Attributes flags must be enabled:
- Select SIP Only from IP Protocol Type.
- BCI Interwork Encountered (in BCI option)
- Transparency (in Privacy option)
- Merge Received Contacts with Existing Contacts (in Redirect option)
- Select Include None from Include Charge Information (in SIP Headers and Parameters option).
- Select None from SIP TO Header Mapping (in SIP Headers and Parameters option).
- Include OLIP (in SIP Headers And Parameters > Flags option)
- Transparency For Destination Trunk Group Parameter (in SIP Headers And Parameters > Flags option)
- End To End Ack (in SIP Headers And Parameters > Flags option)
- Diversion (in SIP Headers And Parameters > Call Forwarding option)
Ip Signaling Profile Egress Ip Attributes
Ingress IP Attributes
The following Ingress IP Attributes flag must be enabled:
- 181 Supported (in Flags option)
Ip Signaling Profile Ingress Ip Attributes
SIP Trunk Group
Execute the following command:
set addressContext "default" zone "ZONE_ACCESSNW" sipTrunkGroup "TG_TOWARDS_UE" media mediaIpInterfaceGroupName "LIF1" commit set addressContext "default" zone "ZONE_ACCESSNW" sipTrunkGroup "TG_TOWARDS_UE" state "enabled" mode "inService" media mediaIpInterfaceGroupName "LIF1" commit
UE TG
Configuring SBC towards IMS Core
The following profiles are configured:
- Transparency Profile
- Trunk Group Configuration Towards P-CSCF
- Zone Index Profile
- IP Signaling Profile
- SIP Trunk Group
IMPORTANT
The Transparency Profile is the recommended method of configuring transparency on the SBC Core for new deployments as well as when applying additional transparency configurations to existing deployments. Do not use IP Signaling Profile flags in these scenarios because the flags will be retired in upcoming releases.
Refer to the SBC SIP Transparency Implementation Guide for additional information.
Transparency Profile
set profiles services transparencyProfile TRANS_PROF_CORENW sipHeader To set profiles services transparencyProfile TRANS_PROF_CORENW sipHeader From set profiles services transparencyProfile TRANS_PROF_CORENW sipHeader Path set profiles services transparencyProfile TRANS_PROF_CORENW sipHeader Accept set profiles services transparencyProfile TRANS_PROF_CORENW sipHeader Reason set profiles services transparencyProfile TRANS_PROF_CORENW sipHeader Server set profiles services transparencyProfile TRANS_PROF_CORENW sipHeader Warning set profiles services transparencyProfile TRANS_PROF_CORENW sipHeader Call-Info set profiles services transparencyProfile TRANS_PROF_CORENW sipHeader Alert-Info set profiles services transparencyProfile TRANS_PROF_CORENW sipHeader Error-Info set profiles services transparencyProfile TRANS_PROF_CORENW sipHeader User-Agent set profiles services transparencyProfile TRANS_PROF_CORENW sipHeader Referred-By excludedMethods register,subscribe,info,publish,message,options,update,bye set profiles services transparencyProfile TRANS_PROF_CORENW sipHeader Request-URI set profiles services transparencyProfile TRANS_PROF_CORENW sipHeader Accept-Language set profiles services transparencyProfile TRANS_PROF_CORENW sipHeader P-Called-Party-Id set profiles services transparencyProfile TRANS_PROF_CORENW sipHeader Require set profiles services transparencyProfile TRANS_PROF_CORENW sipHeader Proxy-Require set profiles services transparencyProfile TRANS_PROF_CORENW sipHeader Security-Client set profiles services transparencyProfile TRANS_PROF_CORENW sipHeader Security-Verify commit set profiles services transparencyProfile TRANS_PROF_CORENW sipMessageBody application/pidf+xml excludedMethods register,invite,subscribe,info,publish,message,options,update,bye set profiles services transparencyProfile TRANS_PROF_CORENW sipMessageBody application/pidf+xml set profiles services transparencyProfile TRANS_PROF_CORENW sipMessageBody application/rlmi+xml set profiles services transparencyProfile TRANS_PROF_CORENW sipMessageBody message/external-body set profiles services transparencyProfile TRANS_PROF_CORENW sipMessageBody application/pidf+xml set profiles services transparencyProfile TRANS_PROF_CORENW sipMessageBody application/cpim-pidf+xml set profiles services transparencyProfile TRANS_PROF_CORENW sipMessageBody application/pidf-diff+xml set profiles services transparencyProfile TRANS_PROF_CORENW sipMessageBody application/dialog-info+xml set profiles services transparencyProfile TRANS_PROF_CORENW sipMessageBody application/simple-filter+xml set profiles services transparencyProfile TRANS_PROF_CORENW sipMessageBody application/resource-lists+xml set profiles services transparencyProfile TRANS_PROF_CORENW sipMessageBody application/conference-info+xml set profiles services transparencyProfile TRANS_PROF_CORENW sipMessageBody application/simple-message-summary commit set profiles services transparencyProfile TRANS_PROF_CORENW state enabled commit set addressContext default zone ZONE_CORENW sipTrunkGroup TG_TOWARDS_IMSCORE services transparencyProfile TRANS_PROF_CORENW commit
Trunk Group Configuration Towards P-CSCF
set addressContext default ipInterfaceGroup LIG2 ipInterface LIF2 ceName SBX30 portName pkt2 ipAddress 10.8.14.125 prefix 16 commit set addressContext default ipInterfaceGroup LIG2 ipInterface LIF2 mode inService state enabled commit set addressContext default zone ZONE_CORENW id 3 sipSigPort 2 state enabled ipAddressV4 10.8.14.125 portNumber 5060 ipInterfaceGroupName LIG2 transportProtocolsAllowed sip-udp,sip-tcp,sip-sctp,sip-tls-tcp commit set addressContext default zone ZONE_CORENW sipTrunkGroup TG_TOWARDS_IMSCORE mode inService state enabled media mediaIpInterfaceGroupName LIG2 commit set addressContext default zone ZONE_CORENW sipTrunkGroup TG_TOWARDS_IMSCORE ingressIpPrefix 10.54.93.181 32 commit set addressContext default zone ZONE_CORENW ipPeer PEER_PCSCF policy sip fqdn pcscf.open-ims.test fqdnPort 4060 commit set addressContext default staticRoute 10.54.93.181 32 10.8.1.1 LIG2 LIF2 preference 100 commit set addressContext default zone ZONE_CORENW sipTrunkGroup TG_TOWARDS_IMSCORE services preconditions transparent commit
Zone Index Profile
The following flags must be configured:
- Zone Index Profile
- Description
- Zone Index
Zone Index Profile IMS
IP Signaling Profile
The following parameters must be configured under "Ip Signaling Profile".
Configuring Common IP Attributes
Enable the following fields on the PSX under IP SIGNALING PROFILE:
- Add P-Charging Function Addr
- Create P-Charging-Vector
- Create P-Visited-Network Id
- Customized Session Timer Behavior
- Disable Host Translation
- End To End BYE
- End To End RE-INVITE
- End To End UPDATE
- End To End PRACK
- Enable Default PUI Procedures
- Enable Dial String Handling
- No Port Number 5060
- P-Called-Party0Id-Support
- Restrict History Info Header
- Store P-Charging Vector
- Store Service-Route Header
- Validate Access Nw Info Header
Common IP Attributes for IMS
Configuring Relay Flags
Enable the following Relay Flags under Ip Signaling profile:
- Dialog Event Package
- Info
- Options
- Reg Event Package
- Select Reject the REFER request if no match is found from Refer to Header Relay option.
Relay Flags for IMS
Configuring Egress IP Attributes
Enable the following parameters :
- Select SIP Only from IP Protocol Type
- Select Transit PAI From Unregistered Peer from Flags
- Select Use IP Signaling Peer Domain In R-URI (in Domain Name)
- Select Include npdi from NPDI Options (in Number Portability Attributes option).
Select P-Preferred-ID from Privacy Information options (in Privacy option).
- Select Include Privacy (in Privacy)
- Select Merge Received Contacts with Existing Contacts from Contact Handling(under Redirect)
- Select Include None from Include Charge Information (in SIP Headers and Parameters option).
- Select Not Send from Session-Expires Refresher (in SIP Headers and Parameters option).
Select None from SIP TO Header Mapping (under SIP Headers And Parameters option).
- Select Transparency For Destination Trunk Group Parameter(under Flags option)
- Select End to End Ack (under Flags option)
- Select Diversion from Redirect Information (under Call Forwarding)
Egress IP Attributes for IMS
SIP Trunk Group
Enable the following profiles/fields:
- Feature Control Profile
- IP Signaling Profile
- Signaling Profile
- SIP Domain
- Zone Index Profile
- 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.
SIP Trunk Group for IMS
Overview
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