在VOLTE和VONR通話中一個關(guān)鍵的網(wǎng)元就是IMS，而SIP消息會話地址之間存在著一定的相關(guān)性；如果這些相關(guān)性沒能正確匹配，可能得到的只有錯誤消息“404 not found”；
IMS/SIP消息中的地址選取，取決于其規(guī)范類型 (RFC、3gpp、承載規(guī)范等) 及在相同規(guī)范的不同版本。本文旨在為您提供一些指南，并幫助您縮小搜索范圍，做為查找這些問題中“尋址“工具；
1.注冊和邀請（Register&Invite）地址結(jié)構(gòu)
1.1 注冊（Register）消息內(nèi)容
根據(jù)TS.34 229-1 V10.2.0 (2013-07) A.1,終端在IMS中注冊包括以下內(nèi)容：
Header/param | Value/remark | Ref |
Request-URI | SIP URI formed from home domain name as stored in EFDOMAIN (when using ISIM) or SIP URI formed from home domain name derived from the IMSI (when no ISIM available on the UICC) | RFC 3261 |
From | any IMPU within the set of IMPUs on ISIM (when using ISIM) or public user identity derived from px_IMSI (when no ISIM available on the UICC) same public user identity as in initial REGISTER public user identity derived from px_IMSI px_EmergencyPublicUserIdentity (if the UE is already registered to IMS or if the UE is using ISIM) or public user identity derived from px_IMSI (when UE is using USIM and UE is not yet registered to IMS) | RFC 3261 |
To | any IMPU within the set of IMPUs on ISIM (when using ISIM) or public user identity derived from px_IMSI (when no ISIM available on the UICC) same public user identity as in initial REGISTER public user identity derived from px_IMSI px_EmergencyPublicUserIdentity (if the UE is already registered to IMS or if the UE is using ISIM) or public user identity derived from px_IMSI (when UE is using USIM and UE is not yet registered to IMS) | RFC 3261 |
Contact Feature Param | SIP URI with IP address or FQDN and indicating either an unprotected port selected by the UE or no port at all. When A7 the SIP URI shall contain the sos URI parameter. SIP URI with IP address or FQDN and protected server port of UE. When A7 the SIP URI shall contain the sos URI parameter. +g.3gpp.icsi-ref="urn%3Aurn-7%3A3gppservice.ims.icsi.mmtel" +g.3gpp.smsip video +sip.instance media feature tag with the instance ID of the UE |
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1.2 邀請（Invite）消息內(nèi)容
根據(jù)TS 34 229-1 V10.2.0 (2013-07) A.2.9,終端在IMS中邀請時包括以下內(nèi)容：
Header/param | Value/remark | Ref |
Request-URI | UE"s registered contact address in SIP URI form, as provided in the Contact header of the REGISTER message UE"s contact address in SIP URI form, as provided in the Contact header within any response or request within the dialog | RFC 3261 |
From | an SIP URI of the SS representing the calling UE SIP URI of SS (i.e. the remote UE) as used in any previous request in the same dialog (In the earlier requests within the same dialog this URI appears in To header within requests sent by the UE and in From header within requests sent by the SS) | RFC 3261 |
To | SIP or TEL URI of the UE SIP URI of the UE as used in any previous request in the same dialog (In the earlier requests within the same dialog this URI appears in From header within requests sent by the UE and in To header within requests sent by the SS) | RFC 3261 |
Contact | SIP URI with IP address or FQDN and protected server port of the calling UE, for example 'sip:caller@3gpp.org:6543'. SIP URI with IP address or FQDN and unprotected server port of the calling UE. |
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2.用戶及通知（SUBSCRIBE / NOTIFY）消息地址結(jié)構(gòu)
3.（被叫）邀請和再見（INVITE / BYE)中地址結(jié)構(gòu)
4.起始到目地（From / To for whole VoLTE Sequence）VOLTE通話地址結(jié)構(gòu)
原文來自：http://www.sharetechnote.com/
整理：kangguoying20200923
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