This document explains how to configure calling line identification presentation (CLIP) to calling line identification restriction (CLIR) support when you place a call from the H.323 network to the SS7 network. It applies to the call control PGW 2200 Softswitch version 9.4(1) and higher and to the Cisco HSI solution.
CLIP is a service provided to the called party that allows the display of the calling number (caller ID). The user-provided calling number must be transported from the caller to the called party.
CLIR is a service provided to the calling party that allow the calling party to indicate whether or not the calling number is to be displayed to the called party. It sets a calling number presentation indicator to allowed or restricted. Regulations require that network administrations remove the calling number before it is sent to the called party, if the calling party has so requested.
Readers of this document should have knowledge of the Cisco Media Gateway Controller Software Release 9 Documentation.
The information in this document is based on these software and hardware versions:
Cisco PGW 2200 Software Releases 9.4(1) or higher
Cisco HSI software 4.1 or higher
SS7 H.246 Annex c H.450 Support for PSTN Side CLIP or CLIR with H.450.8 H.225 CLIP Q.731.3 C.6.2.1 Setup/CGN source address SI/PR CLIR Q.731.4 C.6.2.2 Setup/CGN source address SI/PR
The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.
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The local exchange function establishes the SS7 IAM message in the SS7 network, after a number of basic decisions about the supplied caller ID (if any) are made. If no CLI is supplied or a network CLI is required, then the Cisco PGW 2200 must be able to supply a CLI to the outgoing call on a trunk group basis.
Make the changes in the next section while in call control mode.
This feature allows the CLI presentation and screening indicators to be passed from ISDN User Part (ISUP) IAM messages to the Q.931 portion of the H.323 setup messages, and vice versa. Issue these commands to configure this on the Cisco HSI:
gw mml> prov-sta::srcver="active",dstver="presentation" gw mml> prov-add:name=SYS_CONFIG_STATIC,ClipClirSupported=enabled gw mml> prov-add:name=CCPackage,A_CC_AnumDataSI=1 gw mml> prov-add:name=CCPackage,A_CC_Clir=1 gw mml> prov-cpy
Restart the Cisco HSI. You must restart HSI because these are some of the static variables that must be read at start time or switch-over.
Note: To switch the feature on, the element must be present and given any arbitrary (string) value. To switch the feature off, the element must be given no value (""). Alternatively, it can be deleted from the configuration.
If the presentation restriction bit is still set in the SS7 IAM message, also check the information in the routing plan of the Cisco PGW 2200. In the event that you have to add the command to the routing table, check the dw information. If it set to 1, then it will always go out as restricted.
Note: These are the meanings of the dw values:
Also check this configuration settings on the Cisco PGW 2200 trunk group basis: time-division multiplexing (TDM), Extended ISDN User Part (EISUP), and session initiation protocol (SIP).
Egress (these apply to messages that exit the Cisco PGW 2200, both backward and forward):
SendAddressInCgPN—If set to 0, this setting unconditionally removes address digits.
0—Do not include address digits in the Calling Party Number.
1—Include address digits in the Calling Party Number.
SuppressCLIdigit—If set, this setting removes address parameters, if the presentation indicator is set to restricted.
If the variant is International Telecommunication Union (ITU) Q767_Base on the call incoming side, and if the SS7 IAM message is coming with nature of address (NOA) set to 000011 (not used), then this results in a missing A_number. ITU Q767_Base only supports the sections C.3.7 (Called Party Number) and C.3.8 (Calling Party Number):
C.3.7 Called party number: b) Nature of address indicator 0000000 spare 0000001 , not used 0000010 , not used 0000011 national (significant) number 0000100 international number C.3.8 Calling party number b) Nature of address indicator 0000000 spare 0000001 , not used 0000010 , not used 0000011 , not used 0000100 international number
Here you can see that 0000011 is not supported for Calling Party Number.
If you run a Cisco PGW 2200 Message Definition Language (MDL) trace, you will see the error as validation failed for RANGE or MAP:
!--- Information from the MDL trace. !--- Output suppressed. reading element Q767CallingPartyNumber reading field RAW 56 bits read ok reading field DATA reading field oddEven '1'B ok reading field cgpnoa reading field ok '0000 011'B validation failed for RANGE or MAP not found reading field err '0000 011'B ok
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