IMS LI Configuration

In this section:

Configuring the Call Data Channel

To configure Call Data Channel (CDC):

Configuring SBC Core IPsec

### create and configure IKE and IPsec protection profiles
   
set profiles security ipsecProtectionProfile PRGGSX2_IPSEC_PROT_PROF saLifetimeTime 28800
set profiles security ipsecProtectionProfile PRGGSX2_IPSEC_PROT_PROF espAlgorithms integrity hmacSha1,hmacMd5
set profiles security ipsecProtectionProfile PRGGSX2_IPSEC_PROT_PROF espAlgorithms encryption aesCbc128,_3DesCbc
  
set profiles security ikeProtectionProfile PRGGSX2_IKE_PROT_PROF saLifetimeTime 28800
set profiles security ikeProtectionProfile PRGGSX2_IKE_PROT_PROF algorithms encryption aesCbc128,_3DesCbc
set profiles security ikeProtectionProfile PRGGSX2_IKE_PROT_PROF algorithms integrity hmacSha1,hmacMd5
set profiles security ikeProtectionProfile PRGGSX2_IKE_PROT_PROF dpdInterval noDpd
  
### create IKE peer
  
set addressContext default ipsec peer PRGGSX2 ipAddress 10.220.11.8 preSharedKey 00000000000000000000000000000000 localIdentity type ipV4Addr ipAddress 10.220.41.161
set addressContext default ipsec peer PRGGSX2 remoteIdentity type ipV4Addr ipAddress 10.220.11.22
set addressContext default ipsec peer PRGGSX2 protocol ikev1 protectionProfile PRGGSX2_IKE_PROT_PROF
  
### create an SPD rule for this IKE peer
  
set addressContext default ipsec spd PRGGSX2_SPD state enabled precedence 1001
set addressContext default ipsec spd PRGGSX2_SPD localIpAddr 10.220.41.161 localIpPrefixLen 32 remoteIpAddr 10.220.11.22 remoteIpPrefixLen 32
set addressContext default ipsec spd PRGGSX2_SPD action protect
set addressContext default ipsec spd PRGGSX2_SPD protocol 0
set addressContext default ipsec spd PRGGSX2_SPD protectionProfile PRGGSX2_IPSEC_PROT_PROF
set addressContext default ipsec spd PRGGSX2_SPD mode transport
set addressContext default ipsec spd PRGGSX2_SPD peer PRGGSX2
  
### enable IPsec on the IP interface group
  
set addressContext default ipInterfaceGroup LIG1 enabled

Configuring CDC with IP Interface Group

To create CDC, refer to the section Configuring SBC For Lawful Interception.

% set addressContext default intercept callDataChannel CDC ipInterfaceGroupName LIG1
commit

Mediation server’s ipInterfaceGroup must be different from other signaling ipInterface groups. This ensures that LI doesn't use signaling ipAddress to send intercepted traffic (media/signaling) towards Mediation Server.

Configuring CDC for Intercept Flavor as IMS LI

For other options of configuring the intercept flavor as IMS LI, refer to the section Configuring SBC For Lawful Interception.

% set addressContext default intercept callDataChannel CDC interceptStandard etsi vendorId verint
commit

Configuring CDC for Media Interception Over TCP

% set addressContext default intercept callDataChannel CDC mediationServer MS1 media tcp ipAddress 10.54.78.20 portNumber 65120
commit
% set addressContext default intercept callDataChannel CDC mediationServer MS1 media tcp state enabled mode inService
commit

Configuring CDC for Media Interception Over UDP

% set addressContext default intercept callDataChannel CDC mediationServer MS1 media udp ipAddress 10.54.78.20 portNumber 65200
commit
% set addressContext default intercept callDataChannel CDC mediationServer MS1 media udp state enabled mode inService
commit

Configuring CDC for Signaling Interception

% set addressContext default intercept callDataChannel CDC mediationServer MS1 signaling ipAddress 10.54.78.25 portNumber 65300 protocolType tcp
commit
% set addressContext default intercept callDataChannel CDC mediationServer MS1 signaling state enabled mode inService
commit

The protocolType "udp" is not supported for Signaling interception in this release.

Configuring CDC for RTCP Interception

% set addressContext default intercept callDataChannel CDC rtcpInterception enabled
commit

The rtcpInterception parameter is visible, when interceptStandard and vendorId is configured as IMS LI

Configuring CDC for "Li Pol Dip For Regd Ood Msg"

The parameter liPolDipForRegdOodMsg when enabled is used to indicate SBC to send policy request to PSX for registered Out-Of-Dialog requests(messages) to be intercepted. When this parameter is disabled, policy request is not sent to PSX for registered Out-Of-Dialog requests (messages).

Enable the support for Policy dip, for registered users out-of-dialog messages, to decide on interception, by executing the command

% set addressContext default intercept callDataChannel CDC liPolDipForRegdOodMsg enabled
commit

The liPolDipForRegdOodMsg parameter is visible, when interceptStandard and vendorId is configured as IMS LI.

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Viewing IMS LI Configuration

Enter the show commands to view the configurations.

Viewing the Intercept Details

To view the intercept details, execute the following command:

 > show status addressContext default intercept callDataChannel
callDataChannel CDC {
    mediationServerMediaStatus MS1 {
        tcpChannelstatus outOfService;
        tcpPacketsSent   0;
        tcpPacketsLost   0;
        udpPacketsSent   0;
        udpPacketsLost   0;
    }
    mediationServerSignalingStatus MS1 {
        tcpChannelStatus outOfService;
        DSRSuccess       0;
        DSRFailures      0;
    }
}
[ok]

Viewing the CDC Configuration

To view the CDC configuration, execute the following command:

 % show addressContext default intercept callDataChannel CDC
interceptStandard     threeGpp;
vendorId              utimaco;
ipInterfaceGroupName  LIG1;
liPolDipForRegdOodMsg enabled;
rtcpInterception      enabled;
mediationServer MS1 {
    signaling {
        ipAddress  10.70.54.48;
        portNumber 9632;
        mode       inService;
        state      enabled;
    }
    media {
        tcp {
            ipAddress  10.70.54.48;
            portNumber 8007;
            mode       inService;
            state      enabled;
        }
        udp {
            ipAddress  10.70.54.48;
            portNumber 7241;
            mode       inService;
            state      enabled;
        }
    }
}
[ok]