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Back to Table of Contents

Back to Configuring SBC for IMS

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In this section:

Table of Contents
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Overview

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Excerpt

SBC can be deployed on the access edge as well as on the 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.

Deployment Scenario

The following is the deployment scenarios where SBC acts as Access SBC :

Caption
0Figure
1SBC IMS Deployment - SBC as Access SBC

Call Flows

Anchor
Figure 2
Figure 2
Basic Registration Call Flow

Caption
0Figure
1Basic Registration Call Flow


The call flow description for the Figure 2 is as follows:

  1. Sonus SBC acting as an A-SBC, receives REGISTER request from UE.
  2. Sonus 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. Sonus SBC does not insert a Path header as (external) P-CSCF doesn’t expect a Path header from UE.
  3. P-CSCF forwards REGISTER towards I/S-CSCF. P/I/S-CSCF responds to the REGISTER with 200 OK.
  4. Sonus SBC stores 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.

Anchor
Figure 3
Figure 3
Originating Call from UE

Caption
0Figure
1Originating Call from UE

The call flow description for the Figure 3 is as follows:

  1. Sonus SBC, acting as an A-SBC, receives INVITE request from UE.
  2. Sonus 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 Sonus 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:

Include Page
Transparency_Profile_Note
Transparency_Profile_Note

Anchor
Transparency Profile
Transparency Profile
Transparency Profile

Code Block
languagenone
% 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

Anchor
Trunk Group Configuration Towards UE
Trunk Group Configuration Towards UE
Trunk Group Configuration Towards UE

Code Block
languagenone
% 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

Anchor
IPSec Support for SBC with External PCSCF
IPSec Support for SBC with External PCSCF
IPSec Support for SBC with External P-CSCF

Code Block
languagenone
% 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

Anchor
Non-register Routing Configuration
Non-register Routing Configuration
Non-register Routing Configuration

Code Block
languagenone
% set addressContext default zone ZONE_ACCESSNW sipTrunkGroup TG_TOWARDS_UE callRouting useRouteSet rcbNextHopAndStored
commit

Anchor
Zone Index Profile
Zone Index Profile
Zone Index Profile

The following flags must be configured under PSX Zone Index Profile:

  • Zone Index Profile
  • Description
  • Zone Index
Caption
0Figure
1Zone Index Profile

Anchor
IP Signaling Profile
IP Signaling Profile
IP Signaling Profile

The following parameters should be configured under IP Signaling Profile object:

Anchor
Common Ip Attributes
Common Ip Attributes
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
Caption
0Figure
1Ip Signaling Profile Common Ip Attributes

 

Anchor
Relay Flags
Relay Flags
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.
Caption
0Figure
1Ip Signaling Profile Relay Flags

 

Anchor
Transparency Flags
Transparency Flags
Transparency Flags

The following Transparency Flags must be enabled under Ip Signaling profile:

  • Contact Header*
Caption
0Figure
1Ip Signaling Profile Transparecy Flags

 

Anchor
Egress IP Attributes
Egress IP Attributes
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)
Caption
0Figure
1Ip Signaling Profile Egress Ip Attributes

 

Anchor
Ingress IP Attributes
Ingress IP Attributes
Ingress IP Attributes

The following Ingress IP Attributes flag must be enabled:

  • 181 Supported (in Flags option)
Caption
0Figure
1Ip Signaling Profile Ingress Ip Attributes

 

Anchor
Sip Trunk Group
Sip Trunk Group
SIP Trunk Group

Execute the following command:

Code Block
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 % 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
Caption
0Figure
1UE TG

 

Configuring SBC towards IMS Core

The following profiles are configured:

Include Page
Transparency_Profile_Note
Transparency_Profile_Note

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 default zone ZONE_CORENW sipTrunkGroup TG_TOWARDS_IMSCORE services transparencyProfile TRANS_PROF_CORENW
commit

Anchor
Trunk Group Configuration Towards P-CSCF
Trunk Group Configuration Towards P-CSCF
Trunk Group Configuration Towards P-CSCF

Code Block
languagenone
% 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

Anchor
IMS Zone Index Profile
IMS Zone Index Profile
Zone Index Profile

The following flags must be configured:

  • Zone Index Profile
  • Description
  • Zone Index
Caption
0Figure
1Zone Index Profile IMS

Anchor
IMS IP Signaling Profile
IMS IP Signaling Profile
IP Signaling Profile

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

Anchor
Configuring Common IP Attributes
Configuring Common IP Attributes
Configuring Common IP Attributes

The following must be enabled in 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
Caption
0Figure
1Common IP Attributes for IMS

Anchor
Configuring Relay Flags
Configuring Relay Flags
Configuring Relay Flags

The following Relay Flags must be enabled 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.
Caption
0Figure
1Relay Flags for IMS

Anchor
Configuring Egress IP Attributes
Configuring Egress IP Attributes
Configuring Egress IP Attributes

The following parameters are to enabled :

  • 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)
Caption
0Figure
1Egress IP Attributes for IMS

Anchor
IMS SIP Trunk Group
IMS SIP Trunk Group
SIP Trunk Group

The following profiles/fields must be enabled:

  • 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.

Caption
0Figure
1SIP Trunk Group for IMS

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