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IMS/SIP中的訂閱(SUSCRIBE)和通知(NOTIFY)
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發(fā)表于 2020-10-23 07:54:32  只看樓主 

        IMS/SIP中流程中我們經(jīng)常看到訂閱(SUSCRIBE)通知(NOTIFY)消息,它們的定義、用途及示例分別如下:


1.消息定義

       訂閱(SUSCRIBE)在無線協(xié)議中類似“測量控制”或“信息請求”,要求對方對特定事件或狀態(tài)進(jìn)行報(bào)告;

       通知(NOTIFY)在無線協(xié)議中類似“測量報(bào)告”或“信息反饋”,其是對訂閱(SUSCRIBE)事件的信息反饋(具體見RFC3265中SIP事件定義節(jié));

2.訂閱(SUSCRIBE)支持的事件

        訂閱是經(jīng)常見的事件就是注冊“reg”(注冊狀態(tài)檢查),另有很多其他的事件;詳見下表:

Event

Description

Reference

     reg

          Request   for IMS/SIP Registration Status

  RFC   3680

  presence

Request   for presence information (commonly used in RCS)

   RFC   3856

     winfo

Request   for Watcher information (commonly used in RCS)

   RFC   3857

  xcap-diff

Request   for Xcap-Diff information (commonly used in RCS)

   RFC   3875

3.通知(NOTIFY)支持的事件

       通知(通常是CSCF)有錯誤出現(xiàn)(如481,400,500);除在消息正文之外提供的詳細(xì)(除已訂閱)信息,還會發(fā)送帶有特定訂閱狀態(tài)信息的通知消息(具體參閱RFC3265 3.2.4);

Subscription-State

Description

active(激活)

It   means the subscription is accepted (in most case, authorized as well)

   pending      (暫緩)

It means the subscription   has been received by the notifier, but there is insufficient policy   information to grant or deny the subscription yet

terminated (結(jié)束)

It   means the subscription is terminated and this can specify as a reason code as   follows


deactivated (去激活)

This mean that the   subscription ended (terminated) but the subscriber (UE) SHOULD retry   with a new subscription immediately.


probation (稍后再試)

This   mean that the subscription ended (terminated) but the client   SHOULD retry at some time later.


rejected   (拒絕)

This   mean that the subscription ended (terminated) due to change in authorization   policy. The client SHOULD NOT retry.


timeout   (超時(shí))

This   mean that the subscription ended (terminated) because it is not refreshed   before it expired. The client MAY retry immediately.


giveup

(放棄)

This mean that the   subscription ended (terminated) because the notifier could not obtain   authorization in time


noresource  (無資源)

This mean that the   subscription ended (terminated) because the resource being monitored is no   longer available.


4.訂閱和通知流程

          訂閱(SUSCRIBE)一般由終端(UA)發(fā)起,服務(wù)器應(yīng)答 通知(NOTIFY),其流程簡化如下:

    

image.png

5.訂閱和通知消息內(nèi)容

       以注冊“reg”(注冊狀態(tài)檢查)為例的“訂閱” SUBSCRIBE“通知”NOTIFY )消息內(nèi)容如下:

Step 1 : SUBSCRIBE -----------------------------------

SUBSCRIBE sip:+11234567890@test.3gpp.com SIP/2.0

Via: SIP/2.0/UDP 10.133.202.46:50997;branch=z9hG4bK2968d27245f17c7bcae38c31991bfdaa

Max-Forwards: 70

Contact: <sip:+11234567890@10.133.202.46:50997>;+sip.instance="<urn:gsma:imei:00440113-904785-0>"

To: <sip:+11234567890@test.3gpp.com>

From: <sip:+11234567890@test.3gpp.com>;tag=210a54

Call-ID: d57a0b04-785ba328-13a4d876@10.133.202.46

CSeq: 14534 SUBSCRIBE

Expires: 600000

User-Agent: IM-client/OMA1.0 DUT-IMS

Event: reg

Accept: application/reginfo+xml

P-Access-Network-Info: 3GPP-E-UTRAN-FDD;utran-cell-id-3gpp="0010100010000000"

P-Preferred-Identity: <sip:+11234567890@test.3gpp.com>

Content-Length: 0

 

Step 2 : 200 OK -----------------------------------

SIP/2.0 200 OK

Via: SIP/2.0/UDP 10.133.202.46:50997;branch=z9hG4bK2968d27245f17c7bcae38c31991bfdaa

From: <sip:+11234567890@test.3gpp.com>;tag=210a54

To: <sip:+11234567890@test.3gpp.com>;tag=987654321

Call-ID: d57a0b04-785ba328-13a4d876@10.133.202.46

CSeq: 14534 SUBSCRIBE

Expires: 600000

Contact: <sip:10.133.202.47:5060>

Record-Route: <sip:10.133.202.47;lr>

Content-Length: 0

 

Step 3 : NOTIFY -----------------------------------

NOTIFY sip:+11234567890@test.3gpp.com SIP/2.0

Via: SIP/2.0/UDP 10.133.202.47:5060;branch=z9hG4bK-d1e4c4961ca9d523ae76b67e088589cd

Call-ID: d57a0b04-785ba328-13a4d876@10.133.202.46

From: <sip:+11234567890@test.3gpp.com>;tag=987654321

To: <sip:+11234567890@test.3gpp.com>;tag=210a54

Subscription-State: active;expires=600000

Event: reg

CSeq: 14534 NOTIFY

Contact: <sip:10.133.202.47:5060>

Max-Forwards: 70

Content-Type: application/reginfo+xml

Content-Length: 340

 

<?xml version="1.0" encoding="UTF-8"?>

<reginfo xmlns="urn:ietf:params:xml:ns:reginfo" version="0" state="full">

<registration aor="sip:+11234567890@test.3gpp.com" id="12345" state="active">

<contact id="100" state="active" event="registered" expires="600000">

<uri>sip:+11234567890@10.133.202.46:50997</uri>

</contact>

</registration>

</reginfo>

 

Step 4 : 200 OK -----------------------------------

SIP/2.0 200 OK

Via: SIP/2.0/UDP 10.133.202.47:5060;branch=z9hG4bK-d1e4c4961ca9d523ae76b67e088589cd

Max-Forwards: 70

Contact: <sip:+11234567890@10.133.202.46:50997>;+sip.instance="<urn:gsma:imei:00440113-904785-0>"

To: <sip:+11234567890@test.3gpp.com>;tag=210a54

From: <sip:+11234567890@test.3gpp.com>;tag=987654321

Call-ID: d57a0b04-785ba328-13a4d876@10.133.202.46

CSeq: 14534 NOTIFY

Allow: NOTIFY,SUBSCRIBE

Content-Length: 0


原文來自:http://www.sharetechnote.com

整理:kangguoying20201023

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