1、AMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS ATIS-1000050.2012(R0217) NEXT GENERATION NETWORK (NGN) OPERATOR REGULAR INTERCEPT STANDARD As a leading technology and solutions development organization, ATIS brings together the top global ICT companies to advance the industrys most-pressing busine
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11、uired for this service are only available either within a trust domain or between trusted domains. In addition, in the absence of trust, and depending on exactly which information is not trusted, basic call setup may not function as expected. 3 Normative References The following standards contain pr
12、ovisions which, through reference in this text, constitute provisions of this Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this Standard are encouraged to investigate the possibility of applying the
13、 most recent editions of the standards indicated below. ATIS-1000009 ATIS-1000009.2006 (R2011), IP Network-to-Network Interface (NNI) Standard for VoIP.11This document is available from the Alliance for Telecommunications Industry Solutions (ATIS), 1200 G Street N.W., Suite 500, Washington, DC 20005
14、. 2 ATIS-0100050.2012(R2017)ATIS-10000036 ATIS-1000036, Technical Report on NGN Operator Services.1 ATIS-1000018 ATIS-1000018, Technical Report on NGN Architecture.1 ATIS-1000027 ATIS-1000027, Operator Services Technical Report.1 ATIS-1000666 ATIS-1000666.1999 (R2009), Signalling System No. 7 Operat
15、or Services Network Capabilities.1 4 Definitions the mechanism for deriving the appropriate referral address is outside the scope of this document. Once the desired destination address has been derived, the options for follow-on services (e.g., Call Completion) are similar to the Simple Announcement
16、 use cases. 6.2.2 Interaction Provided by NGN Operator Intercept Service AS As with the simple announcement case, there are no signaling requirements specific to NGN Operator Regular Intercept service delivering the initial call/session setup to a number subject to Regular Intercept service. Normal
17、call/session setup procedures set up a call path to the AS associated with the called number. This may be the Called AS (i.e., the AS associated with the number before Regular Intercept service was activated), or may be the Regular Intercept AS (i.e., an AS that provides Regular Intercept processing
18、). In the former case, the service will redirect the call/session setup to an AS that will play any necessary announcements, interact with the calling party to obtain the information needed to derive the referral number, or offer additional services. The Regular Intercept AS may be in the same netwo
19、rk as the Intercepted Number AS (and, therefore, in the same network as the Called AS) or may be in a different network. Annex A contains illustrative examples of the messaging to set up the call using SIP Redirection (section A.2) and using Call Forwarding (section A.3) for the use case where the I
20、ntercepted Number AS and the AS that provides Regular Intercept processing are in different networks. 7 Security Considerations The information and parameters required for this service are only available within a trust domain or between trusted domains as defined by the network operators. In additio
21、n, in the absence of trust, and depending on exactly which information is not trusted, basic call setup may not function as expected. ATIS-0100050.2012(R2017) 8 Annex A (informative) A Detailed Example Service Call Flows A.1. Simple AnnouncementUE P-CSCF Home Intercepted # Intercepted # Intercepted
22、# Intercepted #S-CSCF IBCF S-CSCF AS MS| |(1) INVITE| |-(2) INVITE| |-| | | | | | |(3) INVITE | | | | | |-| | | | | | |(4) INVITE | | | | | |-| | | | | | |(5) INVITE | | | | | | | | | | | |-| | | | | | |-|(5a) MS Signalig | | | | | | | | | | | | | | | | (6) 183 Session Progress | | | | | | P-CSCFINV
23、ITE sip:+1-NPA-NXX-DIALprovider-; user=phone SIP/2.0Via: SIP/2.0/UDP sip:client.provider-:5060;branch=z9hG4bK74bf9Max-Forwards: 70From: ;tag=1234567To: CSeq: 101 INVITECall-ID: f81d4fae-7dec-11d0-a765-00a0c91e6bf6192.168.1.2Contact: P-Preferred-Identity: Content-Type: application/sdpContent-Length:
24、.9 ATIS-0100050.2012(R2017) This INVITE is generated by the UE, and sent to the P-CSCF. It contains: a. Request-URI indicates the user to which this request is being addressed. In thisexample, the Request-URI contains a “SIP” URI indicating the digits “1+NPA-NXX-DIAL”as dialed by the user. The domai
25、n identifies the callers home provider, and the“user=phone” URI parameter is provided to identify that this represents a phone number.b. Via The Via header field indicates the path taken by the request so far and indicates thepath that should be followed in routing responses. The branch ID parameter
26、 in the Viaheader field serves as a transaction identifier, and is used by proxies to detect loops.c. Max-Forwards The Max-Forwards header field serves to limit the number of hops arequest can transit on the way to its destination. It consists of an integer that isdecremented by one at each hop. If
27、the Max-Forwards value reaches 0 before therequest reaches its destination, it will be rejected with a 483 (Too Many Hops) errorresponse. The default initial value is 70 per RFC 3261.d. From The From header field indicates the logical identity of the initiator of the request,possibly the users addre
28、ss-of-record. Like the To header field, it contains a URI andoptionally a display name. The contents of the From header being generated by the UEare not trusted; rather, the network asserted identity in the P-Asserted-Identity header istrusted.e. To The To header field first and foremost specifies t
29、he desired “logical“ recipient of therequest, or the address-of-record of the user or resource that is the target of this request.This may or may not be the ultimate recipient of the request.f. CSeq The CSeq header field serves as a way to identify and order transactions. Itconsists of a sequence nu
30、mber and a method.g. Call-ID The Call-ID header field acts as a unique identifier to group together a series ofmessages.h. Contact The Contact header field provides a SIP or SIPS URI that can be used tocontact that specific instance of the UA for subsequent requests. In this example, the UEsupplies
31、the Address of Record that was used at registration.i. Content-Type The Content-Type header field indicates the media type of the message-body sent to the recipient. The “media-type“ element is defined in RFC 2046,Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types. At a minimum,appli
32、cation/sdp will be indicated.j. Content-Length The Content-Length header field indicates the size of the message-body, in decimal number of octets, sent to the recipient.k. Session Description The INVITE contains a message body including a SessionDescription (SDP) offer per RFC 2327, SDP: Session De
33、scription Protocol.l. Other headers and message bodies may potentially be present, but are not includedhere.2. INVITE P-CSCF- Home S-CSCFINVITE sip:+1-NPA-NXX-DIALprovider-; user=phone SIP/2.0Via: SIP/2.0/UDP p-cscf-1.provider-:5060;branch=z9hG4bK74bg0Via: SIP/2.0/UDP client.provider-:5060;branch=z9
34、hG4bK74bf9Max-Forwards: 69Record-Route: From: ;tag=123456710 ATIS-0100050.2012(R2017) To: CSeq: 101 INVITE Call-ID: f81d4fae-7dec-11d0-a765-00a0c91e6bf6192.168.1.2 Contact: P-Asserted-Identity: “+1NPA-NXX-ORIG“ P-Charging-Vector: icid-value=1234bc9876e;icid-generated-at=192.0.6.8; orig-ioi=provider-
35、 Content-Type: application/sdp Content-Length: . In addition to information received from the user, the P-CSCF adds the P-Asserted-Identity header. It also adds the P-Charging-Vector header which provides correlation information. The P-CSCF also adds to the Via header and adds a Record-Route header,
36、 which are of no special consequence to Operator Services. It also decrements the Max-Forwards value. Therefore, this INVITE has changed: a. Via The P-CSCF adds a Via header identifying itself to the top of the Via header stack.b. Max-Forwards The P-CSCF decrements the value by one.c. Record-Route T
37、he P-CSCF inserts itself into the Record-Route header.d. P-Asserted-Identity The P-Asserted-Identity header field is used among trusted SIP entities(typically intermediaries) to carry the identity of the user sending a SIP message as it wasverified by authentication. The P-CSCF inserts the P-Asserte
38、d-Identity header field, in thisexample, asserting the identity received in the P-Preferred-Identity.e. P-Preferred-Identity The P-CSCF deletes the P-Preferred Identityf. P-Charging-Vector This is defined in RFC 3455, Private Extensions to the Session InitiationProtocol (SIP) for the 3rd-Generation
39、Partnership Project (3GPP). It provides correlationinformation for charging purposes. It contains a globally-unique IMS Charging Identity (icid).The orig-ioi represents the IMS Inter Operator Identifier for the home provider. The P-CSCFinserts the P-Charging-Vector.3. INVITE Home S-CSCF- Intercepted
40、 Number IBCFINVITE sip:+1-NPA-NXX-DIALprovider-; user=phone SIP/2.0Via: SIP/2.0/UDP s-cscf-1.provider-:5060;branch=z9hG4bK74bh1Via: SIP/2.0/UDP p-cscf-1.provider-:5060;branch= z9hG4bK74bg0Via: SIP/2.0/UDP client.provider-:5060;branch=z9hG4bK74bf9Max-Forwards: 68Record-Route: Record-Route: From: ; ta
41、g=1234567To: CSeq: 101 INVITECall-ID: f81d4fae-7dec-11d0-a765-00a0c91e6bf6192.168.1.211 ATIS-0100050.2012(R2017) Contact: P-Asserted-Identity: “+1NPA-NXX-ORIG“ P-Charging-Vector: icid-value=1234bc9876e;icid-generated-at=192.0.6.8; orig-ioi=provider- Content-Type: application/sdp Content-Length: . Th
42、e S-CSCF determines the home provider of the called party, changes the domain in the Request-URI accordingly, and routes the INVITE to the ingress node of this domain. It also adds to the Via header and adds a Record-Route header, which are of no special consequence to Operator Services. It also dec
43、rements the Max-Forwards value. Therefore, this INVITE has changed: 1. Request-URI The S-CSCF replaces the domain with the home domain of called party.2. Via The S-CSCF adds a Via header identifying itself to the top of the Via header stack.3. Max-Forwards The S-CSCF decrements the value by one.4. R
44、ecord-Route The S-CSCF inserts itself into the Record-Route header.There may be separate IBCFs in each (provider-a and provider-b) network. 4. INVITE Intercepted Number IBCF - Intercepted Number S-CSCFINVITE sip:+1-NPA-NXX-DIALprovider-; user=phone SIP/2.0Via: SIP/2.0/UDP ibcf-1.provider-:5060;branc
45、h=z9hG4bK74bi2Via: SIP/2.0/UDP s-cscf-1.provider-:5060;branch=z9hG4bK74bh1Via: SIP/2.0/UDP p-cscf-1.provider-:5060;branch= z9hG4bK74bg0Via: SIP/2.0/UDP client.provider-:5060;branch=z9hG4bK74bf9Max-Forwards: 67Record-Route: Record-Route: Record-Route: From: ;tag=1234567To: CSeq: 101 INVITECall-ID: f8
46、1d4fae-7dec-11d0-a765-00a0c91e6bf6192.168.1.2Contact: P-Asserted-Identity: “+1NPA-NXX-ORIG“ P-Charging-Vector: icid-value=2345bc9876e;icid-generated-at=192.1.6.8; 12 ATIS-0100050.2012(R2017)orig-ioi=provider- Content-Type: application/sdp Content-Length: . The ingress node routes the call to the S-C
47、SCF. It also adds to the Via header and adds a Record-Route header, which are of no special consequence to Operator Services. It also decrements the Max-Forwards value. Therefore, this INVITE has changed: a. Via The IBCF adds a Via header identifying itself to the top of the Via header stack.b. Max-
48、Forwards The IBCF decrements the value.c. Record-Route The Record-Route header field is inserted by proxies in a request to forcefuture requests in the dialog to be routed through the proxy. The IBCF inserts itself into theRecord-Route header.d. P-Charging-Vector A new P-Charging-Vector is generated
49、 for use in this domain.There may be separate IBCFs in each (provider-a and provider-b) network. Each IBCF makes similar changes to the INVITE. 5. INVITE Intercepted Number S-CSCF - Intercepted Number ASINVITE sip:+1-NPA-NXX-DIALprovider-; user=phone SIP/2.0Via: SIP/2.0/UDP s-cscf-2.provider-:5060;branch=z9hG4bK74bj3Via: SIP/2.0/UDP ibcf-1.pro
