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Back to Table of Contents

Back to New Best Practices in VoLTE Release
Back to Configuring SBC for IMS (VoLTE)

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In this section:

Table of Contents
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Overview

The Proxy CSCF (P-CSCF) is the first contact point within the IM CN subsystem for subscribers in an IMS network. A P-CSCF is allocated to the IMS terminal during IMS registration and does not change for the duration of the registration. From a standards perspective, the P-CSCF behaves like a SIP Proxy, i.e. it accepts requests and services them internally or forwards them on. The P-CSCF also behaves as a User Agent in some cases, i.e. in certain conditions it may terminate and/or independently generate SIP transactions. Examples of these cases are when the P-CSCF requests the registrar for a user’s registration state updates, when performing P-CSCF initiated dialog-release etc.

...

Note
Sonus P-CSCF acts as a combined IMS Application Level Gateway (ALG) and  IMS Access Gateway.

Call Flow

Caption
0Figure
1UE Registration Call Flow

...

  1. UE-A originates a call by sending INVITE with SDP offer towards P-CSCF.
  2. Sonus P-CSCF extracts service information from the SDP offer (IP address of the down link IP flow(s), port numbers to be used, and so on) and forwards the service information to the PCRF over Rx interface. It indicates that only an authorization check of the service information is requested.
  3. Sonus P-CSCF also over writes the received Route headers with the stored Route header set (that is formed based on the Service-Route headers received during registration). Based on the stored route set, the INVITE is forwarded to S-CSCF directly.
    1. If a P-Preferred-Identity header is received from UE, Sonus P-CSCF compares the same with the SIP URI(s) present in P-Associated-URI header contents stores at the time of registration. If they match, the PPI header converted to P-Asserted-Identity header. Else, the top most of P-Associated-URI header contents is sent as P-Asserted-Identity header.
  4. After recieving the 183 response with SDP answer, Sonus P-CSCF extracts service information from the SDP answer (IP address of the up link IP flow(s), port numbers to be used, and so on) and forwards the service information to the PCRF over Rx interface.
  5. The 183 response is forwarded to UE.

Configuring SBC Towards UE

The following profiles are configured:

Anchor
ConfiguringTransparencyProfile
ConfiguringTransparencyProfile
Configuring Transparency Profile

Code Block
languagenone
% set profiles services transparencyProfile TRANS_PROF_ACCESS sipHeader To
% set profiles services transparencyProfile TRANS_PROF_ACCESS sipHeader From
% set profiles services transparencyProfile TRANS_PROF_ACCESS sipHeader Path
% set profiles services transparencyProfile TRANS_PROF_ACCESS sipHeader Accept
% set profiles services transparencyProfile TRANS_PROF_ACCESS sipHeader Reason
% set profiles services transparencyProfile TRANS_PROF_ACCESS sipHeader Server
% set profiles services transparencyProfile TRANS_PROF_ACCESS sipHeader Warning
% set profiles services transparencyProfile TRANS_PROF_ACCESS sipHeader Call-Info
% set profiles services transparencyProfile TRANS_PROF_ACCESS sipHeader Alert-Info
% set profiles services transparencyProfile TRANS_PROF_ACCESS sipHeader Error-Info
% set profiles services transparencyProfile TRANS_PROF_ACCESS sipHeader User-Agent
% set profiles services transparencyProfile TRANS_PROF_ACCESS sipHeader Referred-By excludedMethods register,subscribe,info,publish,message,options,update,bye
% set profiles services transparencyProfile TRANS_PROF_ACCESS sipHeader Request-URI
% set profiles services transparencyProfile TRANS_PROF_ACCESS sipHeader Accept-Language
% set profiles services transparencyProfile TRANS_PROF_ACCESS sipHeader Contact
% set profiles services transparencyProfile TRANS_PROF_ACCESS sipHeader P-Called-Party-Id
commit
% set profiles services transparencyProfile TRANS_PROF_ACCESS sipMessageBody application/pidf+xml
% set profiles services transparencyProfile TRANS_PROF_ACCESS sipMessageBody application/rlmi+xml
% set profiles services transparencyProfile TRANS_PROF_ACCESS sipMessageBody message/external-body
% set profiles services transparencyProfile TRANS_PROF_ACCESS sipMessageBody application/pidf+xml
% set profiles services transparencyProfile TRANS_PROF_ACCESS sipMessageBody application/cpim-pidf+xml
% set profiles services transparencyProfile TRANS_PROF_ACCESS sipMessageBody application/pidf-diff+xml
% set profiles services transparencyProfile TRANS_PROF_ACCESS sipMessageBody application/dialog-info+xml
% set profiles services transparencyProfile TRANS_PROF_ACCESS sipMessageBody application/simple-filter+xml
% set profiles services transparencyProfile TRANS_PROF_ACCESS sipMessageBody application/resource-lists+xml
% set profiles services transparencyProfile TRANS_PROF_ACCESS sipMessageBody application/conference-info+xml
% set profiles services transparencyProfile TRANS_PROF_ACCESS sipMessageBody application/simple-message-summary
% set profiles services transparencyProfile TRANS_PROF_ACCESS sipMessageBody application/vnd.3gpp.srvcc-ext ignoreTransparency yes
commit
% set profiles services transparencyProfile TRANS_PROF_ACCESS  state enabled
commit
% set addressContext ADDR_CONTEXT1 zone ZONE1 sipTrunkGroup TG_TOWARDS_UE services transparencyProfile TRANS_PROF_ACCESS
commit

Anchor
Configuring Trunk Group Towards UE
Configuring Trunk Group Towards UE
Configuring Trunk Group Towards UE

Code Block
languagenone
% set addressContext ADDR_CONTEXT1 ipInterfaceGroup LIG1 ipInterface LIF1 ceName SBX portName pkt0 ipAddress 10.4.8.16 prefix 24 altIpAddress fd00:10:6b50:248f::a altPrefix 60
% set addressContext ADDR_CONTEXT1 ipInterfaceGroup LIG1 ipInterface LIF1 mode inService state enabled
% set addressContext ADDR_CONTEXT1 ipInterfaceGroup LIG2 ipInterface LIF2 ceName SBX portName pkt2 ipAddress 10.4.9.16 prefix 24 altIpAddress fd00:10:6b50:249f::a altPrefix 60
% set addressContext ADDR_CONTEXT1 ipInterfaceGroup LIG2 ipInterface LIF2 mode inService state enabled
% set addressContext ADDR_CONTEXT1 ipInterfaceGroup LIG3 ipInterface LIF3 ceName SBX portName pkt0 ipAddress 10.4.8.18 prefix 24 altIpAddress fd00:10:6b50:248f::c altPrefix 60
% set addressContext ADDR_CONTEXT1 ipInterfaceGroup LIG3 ipInterface LIF3 mode inService state enabled
% set addressContext ADDR_CONTEXT1 ipInterfaceGroup LIG4 ipInterface LIF4 ceName SBX portName pkt0 ipAddress 10.4.8.18 prefix 24 altIpAddress fd00:10:6b50:248f::c altPrefix 60
% set addressContext ADDR_CONTEXT1 ipInterfaceGroup LIG4 ipInterface LIF4 mode inService state enabled
% set addressContext ADDR_CONTEXT1 staticRoute 10.0.0.0 8 10.4.8.1 LIG1 LIF1 preference 100

Anchor
Global Configuration
Global Configuration
Global Configuration

Anchor
Create Emergency Profile
Create Emergency Profile
Create Emergency Profile

Code Block
languagenone
% set profiles services emergencyCallProfile IMS-EMG prefix 911
% commit

Anchor
Create SIP Security Profile
Create SIP Security Profile
Create SIP Security Profile

Code Block
languagenone
% set profiles services sipSecurityProfile PCSCF sipSecurityMechanism ipsec-3gpp precedence 1
% commit

Anchor
Configure Ingress IAD TG
Configure Ingress IAD TG
Configure Ingress Trunk Group

Code Block
languagenone
% set addressContext ADDR_CONTEXT1 zone ZONE1 sipTrunkGroup TG_PCSCF_INT_IP policy signaling ipSignalingProfile DFL_PCSCF_UE_TG_PROF
% commit
% set addressContext ADDR_CONTEXT1 zone ZONE1 sipTrunkGroup TG_PCSCF_INT_IP signaling P-HeaderExtensions insertpVisitedNetworkID 'sonusNetworks'
% commit
% set addressContext ADDR_CONTEXT1 zone ZONE1 sipTrunkGroup TG_PCSCF_INT_IP signaling registration requireRegistration required-nonpriority
% commit
% set addressContext ADDR_CONTEXT1 zone ZONE1 sipTrunkGroup TG_PCSCF_INT_IP signaling prefRequireTransparency enabled
% commit
% set addressContext ADDR_CONTEXT1 zone ZONE1 sipTrunkGroup TG_PCSCF_INT_IP signaling condIncMethInAllowHdr enabled
% commit

Anchor
Configure Outbound Direction
Configure Outbound Direction
Configure Outbound Direction

Code Block
languagenone
% set addressContext ADDR_CONTEXT1 zone ZONE1 sipTrunkGroup TG_PCSCF_INT_IP signaling keepSupport enabled outboundSupport enabled
% commit
% set addressContext ADDR_CONTEXT1 zone ZONE1 sipTrunkGroup TG_PCSCF_INT_IP services natTraversal outboundTcpKeepaliveTimer 240 outboundUdpKeepaliveTimer 60
% commit 

Anchor
Configure Rx Interface
Configure Rx Interface
Configure Rx Interface

Code Block
languagenone
% set addressContext ADDR_CONTEXT1 diamNode DIAMNODE originRealm sbc.com primaryOriginHost primary.sbc.com secondaryOriginHost secondary.sbc.com transactionTimeout 6000 ipInterfaceGroupName LIF1 ipV4Address 172.16.13.120
% set addressContext ADDR_CONTEXT1 diamNode DIAMNODE state enabled
% commit
% set addressContext ADDR_CONTEXT1 diamNode DIAMNODE peer RX.SONUS.COM fqdn htpcgw01.ims.mnc094.mcc235.3gppnetwork.org ipAddress 172.16.13.30
% commit
% set addressContext ADDR_CONTEXT1 diamNode DIAMNODE peer RX.SONUS.COM state enabled
% commit
% set addressContext ADDR_CONTEXT1 diamNode DIAMNODE realmRoute RX.SONUS.COM realm ims.mnc094.mcc235.3gppnetwork.org peer RX.SONUS.COM appId rx
% commit
% set addressContext ADDR_CONTEXT1 diamNode DIAMNODE realmRoute RX.SONUS.COM state enabled
% commit
% set addressContext ADDR_CONTEXT1 zone ZONE1 sipTrunkGroup TG_PCSCF_INT_IP media pcrf pcrfRealm ims.mnc094.mcc235.3gppnetwork.org pcrfCommitment supported cushionPacketSize enabled cushionNullSdp enabled 

Anchor
Configure Rf Interface
Configure Rf Interface
Configure Rf Interface

Code Block
languagenone
% set addressContext ADDR_CONTEXT1 diamNode DIAMNODE originRealm sbc.com primaryOriginHost sonus.sbc.com secondaryOriginHost sonus.sbc2.com transactionTimeout 6000 ipInterfaceGroupName LIF1 ipV4Address 172.16.13.120
% set addressContext ADDR_CONTEXT1 diamNode DIAMNODE state enabled
% commit
% set addressContext ADDR_CONTEXT1 diamNode DIAMNODE peer RF.SONUS.COM fqdn htpcgw01.ims.mnc094.mcc235.3gppnetwork.org ipAddress 172.16.13.30
% commit
% set addressContext ADDR_CONTEXT1 diamNode DIAMNODE peer RF.SONUS.COM state enabled
% commit
% set addressContext ADDR_CONTEXT1 diamNode DIAMNODE realmRoute RF.SONUS.COM realm ims.mnc094.mcc235.3gppnetwork.org peer RF.SONUS.COM appId rf
% commit
% set addressContext ADDR_CONTEXT1 diamNode DIAMNODE realmRoute RF.SONUS.COM state enabled
% commit
% set global signaling diamSigControls defaultCCF 172.16.13.30
% commit
% set global signaling diamSigControls enableRfApp enabled
% commit
% set global signaling diamSigControls generateFailedEventAcr enabled
% commit
% set global signaling diamSigControls maxACRretransmission 3 

Anchor
Attach Emergency Profile
Attach Emergency Profile
Attach Emergency Profile

Code Block
languagenone
% set addressContext ADDR_CONTEXT1 zone ZONE1 sipTrunkGroup TG_PCSCF_INT_IP services emergencyCallHandlingMode none emergencyCallProfile IMS-EMG
% commit
% set addressContext ADDR_CONTEXT1 zone ZONE1 sipTrunkGroup TG_PCSCF_INT_IP signaling usePsxRouteForEmergencyCall enable
% commit 

Anchor
Associate SIP Security Profile
Associate SIP Security Profile
Associate SIP Security Profile

Code Block
languagenone
% set addressContext ADDR_CONTEXT1 zone ZONE1 sipTrunkGroup TG_PCSCF_INT_IP services sipSecurityProfile PCSCF
% commit 

Anchor
Zone 1 Configuration (Towards UE)
Zone 1 Configuration (Towards UE)
Zone 1 Configuration (Towards UE)

Code Block
languagenone
% set addressContext ADDR_CONTEXT1 zone ZONE1 id 5 sipSigPort 1 ipInterfaceGroupName LIG1 ipAddressV4 10.4.8.16 ipAddressV6 fd00:10:6b50:248f::a portNumber 5060 transportProtocolsAllowed sip-tcp,sip-udp,sip-tls-tcp,sip-sctp mode inService state enabled
% set addressContext ADDR_CONTEXT1 zone ZONE1 dialogTransparency enabled
% set addressContext ADDR_CONTEXT1 zone ZONE1 disableZoneLevelLoopDetection disabled

 

Anchor
ConfiguringZoneIndexProfile
ConfiguringZoneIndexProfile
Configuring Zone Index Profile

The following flags must be configured:

...

Caption
0Figure
1Configuring Zone Index Profile

Anchor
ConfiguringIPSignalingProfile
ConfiguringIPSignalingProfile
Configuring IP Signaling Profile

The following parameters are configured :

Anchor
ConfiguringCommonIPAttributes
ConfiguringCommonIPAttributes
Configuring Common IP Attributes

The following must be enabled in PSX under "IP SIGNALING PROFILE":

...

Caption
0Figure
1Configuring Common IP Attributes

Anchor
ConfiguringRelayFlags
ConfiguringRelayFlags
Configuring Relay Flags

The following "Relay Flags" must be enabled under "Ip Signaling profile":

...

Caption
0Figure
1Configuring Relay Flags

Anchor
ConfiguringEgressIPAttributes
ConfiguringEgressIPAttributes
Configuring Egress IP Attributes

The following parameters are to enabled :

...

Caption
0Figure
1Configuring Egress IP Attributes

Anchor
Configuring Ingress IP Attributes
Configuring Ingress IP Attributes
Configuring Ingress IP Attributes

The following parameter is to be enabled:

...

Caption
0Figure
1Configuring Ingress IP Attributes

Anchor
ConfiguringSIPTrunkGroup
ConfiguringSIPTrunkGroup
Configuring SIP Trunk Group

Code Block
languagenone
% set addressContext ADDRESS_CONTEXT1 zone ZONE1 sipTrunkGroup TG_TOWARDS_UE
commit 

...

Caption
0Figure
1Configuring SIP Trunk Group

Configuring SBC Towards S-CSCF

The following profiles are configured:

Anchor
ConfiguringTransparencyProfileSCCAS
ConfiguringTransparencyProfileSCCAS
Configuring Transparency Profile

Code Block
languagenone
% 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 ADDR_CONTEXT1 zone ZONE2 sipTrunkGroup TG_TOWARDS_SCSCF services transparencyProfile TRANS_PROF_CORENW
commit

Anchor
ConfiguringZoneIndexProfileSCCAS
ConfiguringZoneIndexProfileSCCAS
Configuring Zone Index Profile

Code Block
languagenone
% set addressContext ADDR_CONTEXT1 zone ZONE2 dialogTransparency enabled
% set addressContext ADDR_CONTEXT1 zone ZONE2 disableZoneLevelLoopDetection disabled

...

Caption
0Figure
1Zone Index Profile for SCCAS

Anchor
ConfiguringIPSignalingProfileSCCAS
ConfiguringIPSignalingProfileSCCAS
Configuring IP Signaling Profile

The following parameters must be configured under "Ip Signaling Profile".

Anchor
ConfiguringCommonIPAttributesSCCAS
ConfiguringCommonIPAttributesSCCAS
Configuring Common IP Attributes

The following must be enabled in PSX under "IP SIGNALING PROFILE":

...

Caption
0Figure
1Common IP Attributes for SCCAS

Anchor
ConfiguringRelayFlagsSCCAS
ConfiguringRelayFlagsSCCAS
Configuring Relay Flags

The following "Relay Flags" must be enabled under "Ip Signaling profile":

...

Caption
0Figure
1Relay Flags for SCCAS

Anchor
ConfiguringEgressIPAttributesSCCAS
ConfiguringEgressIPAttributesSCCAS
Configuring Egress IP Attributes

The following parameters are to enabled :

...

Caption
0Figure
1Egress IP Attributes for SCCAS

Anchor
ConfiguringSIPTrunkGroupSCCAS
ConfiguringSIPTrunkGroupSCCAS
Configuring SIP Trunk Group

The following profiles/fields must be enabled:

...

Caption
0Figure
1SIP Trunk Group for SCCAS

Configuring I-CSCF

Refer Configuring SBC Towards S-CSCF/SCCAS section in Configuring SBC as IBCF.

Configuring IBCF

Configuring External Peer

Code Block
languagenone
% set addressContext ADDR_CONTEXT1 zone ZONE3 id 5 sipSigPort 1 ipInterfaceGroupName LIG3 ipAddressV4 10.4.8.18 ipAddressV6 fd00:10:6b50:248f::c portNumber 5060 transportProtocolsAllowed sip-tcp,sip-udp,sip-tls-tcp,sip-sctp mode inService state enabled
% set addressContext ADDR_CONTEXT1 zone ZONE3 dialogTransparency enabled

...

Code Block
languagenone
% set addressContext ADDR_CONTEXT1 zone ZONE3 sipTrunkGroup IPTG-4 media mediaIpInterfaceGroupName LIG3
% set addressContext ADDR_CONTEXT1 zone ZONE3 sipTrunkGroup IPTG-4 ingressIpPrefix 10.54.80.101 32
% set addressContext ADDR_CONTEXT1 zone ZONE3 sipTrunkGroup IPTG-4 ingressIpPrefix 10.54.80.8 32
% set addressContext ADDR_CONTEXT1 zone ZONE3 sipTrunkGroup IPTG-4 mode inService state enabled
% set addressContext ADDR_CONTEXT1 zone ZONE3 sipTrunkGroup IPTG-4 signaling registration requireRegistration none
% set addressContext ADDR_CONTEXT1 zone ZONE3 sipTrunkGroup IPTG-4 signaling relayNonInviteRequest enabled
% set addressContext ADDR_CONTEXT1 zone ZONE3 sipTrunkGroup IPTG-4 services transparencyProfile IBCF_COMMON_HTP
% set addressContext ADDR_CONTEXT1 zone ZONE3 sipTrunkGroup IPTG-4 callRouting sendRouteUriToPsx enabled
% set addressContext ADDR_CONTEXT1 zone ZONE3 sipTrunkGroup IPTG-4 signaling skipDTGLookupForRouteHdr enabled
% set addressContext ADDR_CONTEXT1 zone ZONE3 sipTrunkGroup IPTG-4 callRouting useRouteSet received
% set addressContext ADDR_CONTEXT1 zone ZONE3 sipTrunkGroup IPTG-4 media omrAllowed enabled
% set addressContext ADDR_CONTEXT1 zone ZONE3 sipTrunkGroup IPTG-4 media primaryRealmName RealmName2
% set addressContext ADDR_CONTEXT1 zone ZONE3 sipTrunkGroup IPTG-4 media directMediaAllowed disabled
% set addressContext ADDR_CONTEXT1 zone ZONE3 sipTrunkGroup IPTG-4 transitIoi "IBCF"
% set addressContext ADDR_CONTEXT1 zone ZONE3 sipTrunkGroup IPTG-4 callRouting sendRouteUriToPsx enabled
% set addressContext ADDR_CONTEXT1 zone ZONE3 sipTrunkGroup IPTG-4 services honorSdpClockRate enabled
% set addressContext ADDR_CONTEXT1 zone ZONE3 sipTrunkGroup IPTG-4 services preconditions transparent

Refer For PSX related configuration, refer to the following : sections of IBCF Configuration (Zone 1 Configuration (Towards P-CSCF in Roaming)):

  • Configuring PSX Route URI Based Routing
  • Configuring IP Signaling Profile
  • Configuring SIP Trunk Group