1、VoLTE Log 分析与主要 SIP 消息高通在 IMS 产品介绍会上明确说明将 VoLTE 代码封装在 Modem 里,故VoLTE 的 Log 主要是在 Modem 里;在 Main Log 和 Radio Log 里的信息量较少或压根没有输出;Net Log 里是 SIP 消息相关的,主要是看 SIP 消息的流程、配置有没有问题。一、Log 分析分析问题时,整体方向是:先用 Wireshark 看下有没有 SIP 消息,SIP 消息有没有异常,再看 Modem Log 里的空中接口相关的 Log,最后看详细的 Modem Log。如果定位不到问题,或看 Modem Log 有困难,找网
2、络适应性组的帮忙分析(早期是张平平在跟 VoLTE),他们经验比较丰富,对空口消息比较熟悉,从Modem 侧定位问题比较快速。如果网络适应性组的同事也定位不到问题,或忙不过来,需要提 Case 给高通,请高通的技术支持协助分析。检查点:1. NV 参数NV 01896 ipv6_enabled 1 (1:开启 IPv6 地址类型)NV 67261 IMSParamSrc 2 (2:从卡里读注册参数;0:从 NV 67258 读)NV 67264 - RegPCOEnable/RegPreConfigEnabled1) 注网时通过 PCO 发 P-CSCF 请求获取 P-CSCF 地址RegPC
3、OEnable = 1, RegPreConfigEnabled = 0AT$QCPDPIMSCFGE=1,1,0,0 (Set PCO for profile 1)2) 从 ISIM 卡读取 P-CSCF 域名RegPCOEnable = 0, RegPreConfigEnabled = 1Set regManagerPreConfigServerBase to empty3) 从 NV 里读取 P-CSCF 地址RegPCOEnable = 0, RegPreConfigEnabled = 1Set regManagerPreConfigServerBase = “P-CSCF IP ad
4、dress”:SIP PortNV 71527 - iISIMPriority/iNVPriority/iPCOPriorityP-CSCF 地址获取方式的优先级,0 为禁用,值越小优先级越高(正数值)A.P-CSCF from PCO and IMS parameters from Card: ISIM=2, NV=3, PCO=1B.P-CSCF from NV and all others from Card: ISIM=1, NV=2, PCO=0C.All IMS parameters from NV: ISIM=0, NV=1, PCO=02. SIM 卡USIM/ISIM,只有这
5、两种 SIM 卡可以注册 IMS,USIM 根据 IMSI 构造,ISIM 读卡里的 IMPI 和 IMPU。IMS用户标识:每个用户分配1个私有用户标识(IMPI)和多个公有用户标识(IMPU) (IMPI:IM Private Identity,私有用户标识,IMPU:IM Public Identity,公有用户标识)。IMPI用于注册、授权、管理、计费等目的。IMPU用于用户之间进行通讯,采用SIP URI格式或者TEL URI格式,包含1个E.164的TEL URI和2个SIP URI。其中TEL URI用户可见,用于业务发起与终结业务。SIP URI用户不可见,用于融合通信域内的管
6、理与路由。在融合通信系统中,一个用户的所有IMPU构成一个隐式注册集。所有码号由网络配置,通过终端配置服务下发到终端。不允许用户申请自定义的SIP URI。具体用户标识如下:TEL URI:采用E.164编号,使用用户的手机号码,具体格式如: tel:+8613901011111SIP URI:采用E.164编号+域名方式,具体格式如:sip:+8613901011111.ims.mnc.mcc.3gppnetwork.org。融合通信采用与VoLTE使用相同的IMPI和IMPU。省公司 HSS 签约数据要求如表 8-1 所示。高通文档对 SIM 卡要求的描述如下:The UICC card
7、needs to have an ISIM application along with the proper credentials for IMS registration. The credentials include:From the USIMMobile Subscriber Integrated Services Digital Network Number (MSISDN) Generally the phone number of the deviceFrom the ISIMIMS Private Identity (IMPI)IMS Public Identity (IM
8、PU)Domain Domain of the home networkSecurity Key Subscriber key for security authenticationOP Operator algorithm configuration valueAuthScheme parameters Algorithms for security authentication3. 网络要注册到支持 VoLTE 的 LTE 网络,并且数据网络开关要打开,Default APN 要设置好,Default APN 和 IMS APN 的 IP 地址类型要设置好(如: IPV4V6) 。有些卡虽
9、然支持 IMS,但是可能会被 Modem 端的一些配置文件屏蔽掉(carrier_policy.xml) ,导致只能注册 GSM 网 - 调试时碰到 PLMN 为 46005 的白卡被屏蔽的案例。IMS 的注册和退注册,完全由 Modem 端控制,上层不可见。注册网络时,如果发起连接的 PDN 的 APN 类型里有 IMS(如 APN 类型配为:default,ia,ims) ,基站激活默认承载(手机上网用的那个 PDN) ,会下发 P-CSCF 的地址,手机随后向该地址发起 IMS 注册;如果手机在默认承载里没有 P-CSCF 地址,手机会发起 IMS 的 PDN 请求;如果在 Defaul
10、t PDN 和 IMS PDN 两个承载里都没有发现 P-CSCF 地址,则不会发起 IMS 注册。高通文档描述:When the UE powers up, it will initially attach to the IMS PDN, then the IMS app on the modem side will automatically connect to the IMS PDN for IMS registration. As soon as attach is complete, Android will use the default profile to trigger a
11、n additional PDN connect to the internet PDN.We usually create two Profiles for the VoLTE by QMICM, the first one is for the Internet APN and the second is for the IMS APN. The MTP will attach to the Internet APN and then initiate the PDN Connect request to the IMS APN. After the successfully IMS AP
12、N connection and QCI = 5 bear activation, the MTP will be able to send IMS SIP Register Message to the P-CSCF.4. 通路检查SIM 卡,射频功率,和 Modem 侧检查Contents:Camping IssuesSIB Decode FailureRACH FailuresRadio Link FailuresLow DL Throughput IssuesLow UL Throughput IssuesData Sanity for Throughput IssuesF3 Keyw
13、ords80-NE962-1_A_LTE_AS_Typical_Field_Scenarios_Checklists.pdf二、SIP 消息:会话初始化协议 SIP(Session Initiation Protocol)是一个在 IP 网络上进行多媒体通信的应用层控制协议,它被用来创建,修改, 和终结一个或多个参加者参加的会话进程。SIP Body 里的 SDP(会话描述)部分,请阅读 SDP 协议。SIP 的请求方法:INVITE,ACK, BYE,CANCEL ,OPTIONS ,REGISTER,PRACK,SUBSCRIBE,NOTIFY,PUBLISH,INFO ,REFER,ME
14、SSAGE,UPDATE 。详细内容请阅读 SIP 协议。中移动在 IMS 用的 SIP,有部分扩展,详细内容请阅读 中国移动 CM-IMS(SIP)技术规范 的第 2 部分中国移动 CM-IMS(SIP)技术规范_第 2 部分:SIP的消息 V1.0.0.doc ,该文档描述了 CM-IMS 所用的 SIP 的格式,信息头名称简写也可以查到。详细的 SIP 消息流程,请阅读 中国移动 CM-IMS(SIP)技术规范的第 3 部分中国移动 CM-IMS(SIP)技术规范_ 第 3 部分:SIP 的基本流程.doc 。中移动对 SIP 消息、头域以及信令流程提出的定制化需求,请阅读 中国移动 C
15、M-IMS(SIP)技术规范的第 4 部分中国移动 CM-IMS(SIP)技术规范_第 4部分:CM-IMS 业务对 SIP 的要求 V1.0.0.doc 。这里只列出 IMS 注册、主叫、被叫、eSRVCC、 PS 上收发 SMS,退注册的SIP 消息和空中接口消息,其他的 SIP 消息请阅读 41-融合通信接口规范(终端-平台接口分册)v1.0.0(技术参考版).pdf 、 41- 融合通信接口规范(终端-平台接口分册)v1.0.0(技术参考版)20140716.docx(两个文档内容一样, word 格式易于搜索) ,其他的空中接口消息请阅读 VoLTE 终端测试规范 通信功能和性能分册
16、V1.0.0(报批稿).pdf 。1. IMS 注册SIP 消息:Request: REGISTER sip:ims.mnc001.mcc001.3gppnetwork.org (1 binding)Status: 401 UnauthorizedRequest: REGISTER sip:ims.mnc001.mcc001.3gppnetwork.org (1 binding)Status: 200 OK (1 binding)说明:MS NW 手机向网络(PLMN 为 00101)请求 IMS 注册NW MS 网络回复 401 Unauthorized,消息里携带鉴权需要用到的信息MS N
17、W 手机再次请求 IMS 注册,消息里携带鉴权应答信息NW MS 网络回复 200 OK,消息里携带 VoLTE 能力信息空口消息如下:UL RRC CONNECTION REQUEST /RRC 请求UL RRC CONNECTION SETUP COMPLETE /RRC 请求建立DL EMM: AUTHENTICATION REQUEST /鉴权请求UL EMM: AUTHENTICATION RESPONSE /鉴权应答DL EMM: SECURITY MODE COMMAND /安全模式命令(信令完整性保护)UL EMM: SECURITY MODE COMPLETE /安全模式完成
18、DL SECURITY MODE COMMANDUL SECURITY MODE COMPLETEDL ESM: ESM INFORMATION REQUEST /ESM 信息请求UL ESM: ESM INFORMATION RESPONSE /ESM 信息应答DL EMM: IDENTITY REQUEST /身份请求(IMSI)UL EMM: IDENTITY RESPONSE /身份应答DL UE CAPABILITY ENQUIRY /UE 能力查询UL UE CAPABILITY INFORMATION /UE 能力应答DL RRC CONNECTION RECONFIGURATI
19、ON /RRC 连接重配UL RRC CONNECTION RECONFIGURATION COMPLETE /RRC 连接重配完成UL EMM: ATTACH COMPLETE / ESM: ACTIVATE DEFAULT EPS BEARER CONTEXT ACCEPTDL EMM: EMM INFORMATIONUL ESM: PDN CONNECTIVITY REQUEST /PDN 连接请求DL RRC CONNECTION RECONFIGURATION /RRC 连接重配UL RRC CONNECTION RECONFIGURATION COMPLETE /RRC 连接重配完
20、成UL ESM: ACTIVATE DEFAULT EPS BEARER CONTEXT ACCEPT /默认承载建立具体的 SIP 消息:REGISTER sip:ims.mnc001.mcc001.3gppnetwork.org SIP/2.0f: ;tag=559862614t: CSeq: 559862607 REGISTERi: 559862608_185027992192.168.1.1v: SIP/2.0/UDP 192.168.1.1:5060;branch=z9hG4bK1775912190Max-Forwards: 70m: ;+sip.instance=“;+g.3gpp
21、.icsi-ref=“urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel“;+g.3gpp.smsip;audio;videoRoute: P-Access-Network-Info: 3GPP-E-UTRAN-TDD; utran-cell-id-3gpp=0010100010000000l: 0Authorization: Digest uri=“sip:ims.mnc001.mcc001.3gppnetwork.org“,username=“001010123456789ims.mnc001.mcc001.3gppnetwork.org“,response
22、=“,realm=“ims.mnc001.mcc001.3gppnetwork.org“,nonce=“Expires: 7200k: pathAllow: INVITE,BYE,CANCEL,ACK,NOTIFY,UPDATE,REFER,PRACK,INFO,MESSAGE,OPTIONSSIP/2.0 401 UnauthorizedMax-Forwards: 70Via: SIP/2.0/UDP 192.168.1.1:5060;branch=z9hG4bK1775912190From: ;tag=559862614To: ;tag=987654321Call-ID: 55986260
23、8_185027992192.168.1.1CSeq: 559862607 REGISTERAllow: INVITE, ACK, CANCEL, BYE, PRACK, MESSAGEWWW-Authenticate: digest realm=“ims.mnc001.mcc001.3gppnetwork.org“,nonce=“oM42/i7uOko6JtopNRZQTM1qu1w9soAAoN8UzWq73D0=“,qop=“auth“,opaque=“3c6d55553a25424297fe4c604283c04d“,algorithm=AKAv1-MD5Content-Length:
24、 0REGISTER sip:ims.mnc001.mcc001.3gppnetwork.org SIP/2.0f: ;tag=559862948t: CSeq: 559862608 REGISTERi: 559862608_185027992192.168.1.1v: SIP/2.0/UDP 192.168.1.1:5060;branch=z9hG4bK3758589676Max-Forwards: 70m: ;+g.3gpp.icsi-ref=“urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel“;+g.3gpp.smsip;audio;video;+sip
25、.instance=“Route: P-Access-Network-Info: 3GPP-E-UTRAN-TDD; utran-cell-id-3gpp=0010100010000000l: 0Authorization: Digest username=“001010123456789ims.mnc001.mcc001.3gppnetwork.org“,realm=“ims.mnc001.mcc001.3gppnetwork.org“,uri=“sip:ims.mnc001.mcc001.3gppnetwork.org“,qop=auth,nonce=“oM42/i7uOko6JtopNR
26、ZQTM1qu1w9soAAoN8UzWq73D0=“,nc=00000001,cnonce=“559862599“,algorithm=AKAv1-MD5,response=“e2b7ccc174945b193ea9c8529a2c28f0“,opaque=“3c6d55553a25424297fe4c604283c04d“Expires: 7200k: pathAllow: INVITE,BYE,CANCEL,ACK,NOTIFY,UPDATE,REFER,PRACK,INFO,MESSAGE,OPTIONSSIP/2.0 200 OKMax-Forwards: 70Via: SIP/2.
27、0/UDP 192.168.1.1:5060;branch=z9hG4bK3758589676From: ;tag=559862948To: ;tag=559862948Call-ID: 559862608_185027992192.168.1.1CSeq: 559862608 REGISTERAllow: INVITE, ACK, CANCEL, BYE, PRACK, MESSAGEDate: Sat, 15 Nov 2014 16:24:51 GMTP-Associated-URI: Contact: ;+g.3gpp.icsi-ref=“urn%3Aurn-7%3A3gpp-servi
28、ce.ims.icsi.mmtel“;+g.3gpp.smsip;audio;video;+sip.instance=“;expires=7200Content-Length: 02. 主叫流程融合通信 A P P主叫接入控制模块 ( 接入控制功能 )主叫接入控制模块 ( 会话控制功能 )被叫接入控制模块 ( 会话控制功能 )1 ) 融合通信 A P P 发起呼叫 , I N V I T E 消息中的 R e q u e s t - u r i 被叫T E L 号码新通话模块( 主叫 )新通话模块( 被叫 )2 ) 路由呼叫请求5 ) 查询被叫用户 T E L U R I3 ) 进行主叫侧业务
29、触发4 ) 返回响应6 ) 返回被叫用户 S I P U R I8 ) 进行被叫业务触发9 ) 被叫新通话模块判断被叫用户在线 , 处理相关业务逻辑1 7 ) 路由 1 8 0 消息1 8 ) 路由 1 8 0 消息1 0 ) 呼叫请求落地至被叫 A P P1 1 ) 被叫 A P P 返回 1 8 0 等信息 , 应答后双方接通呼叫融合通信 A P P1 2 ) 信令触发1 3 ) 返回响应1 4 ) 路由 1 8 0 消息回主叫域接入控制模块 ( 码号映射功能 )7 ) 根据被叫 U R I 继续路由呼叫请求1 6 ) 信令路由1 5 ) 业务触发SIP 消息:Request: INVIT
30、E sip:0123456789;phone-context=ims.gd.chinamobile. com;user=phoneStatus: 100 TryingStatus: 180 RingingRequest: PRACK sip:0123456789192.168.1.2:55379;transport=udpStatus: 200 OKStatus: 200 OKRequest: ACK sip:0123456789192.168.1.2:55379;transport=udpRequest: BYE sip:0123456789192.168.1.2:55379;transpo
31、rt=udpStatus: 200 OK说明:MS NW 手机语音呼叫用户 0123456789NW MS 网络回复 100 Trying,开始寻呼NW MS 网络回复 180 Ringing,找到被叫,响铃振铃MS NW 手机用 PRACK 回复 100rel,通知网络已收到振铃消息NW MS 网络回复 200 OK (PRACK)NW MS 网络回复 200 OK (INVITE),被叫应答MS NW 主叫回复 ACK,呼叫建立. . 通话中 . .MS NW 主叫发 BYE 挂机NW MS 网络回复 200 OK,挂断电话空口消息如下:DL RRC CONNECTION RECONFIG
32、URATIONUL RRC CONNECTION RECONFIGURATION COMPLETEUL ESM: ACTIVATE DEDICATED EPS BEARER CONTEXT ACCEPT /专用承载建立DL RRC CONNECTION RECONFIGURATIONUL RRC CONNECTION RECONFIGURATION COMPLETEUL ESM: DEACTIVATE EPS BEARER CONTEXT ACCEPT /恢复默认承载具体的 SIP 消息:INVITE sip:0123456789;phone-context=;user=phone SIP/2
33、.0f: “18406630020“ ;tag=561128308t: CSeq: 561128295 INVITEi: 561128295_185090136192.168.1.1v: SIP/2.0/UDP 192.168.1.1:5060;branch=z9hG4bK3624637363Max-Forwards: 70m: ;+g.3gpp.icsi-ref=“urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel“;audio;videoRoute: P-Access-Network-Info: 3GPP-E-UTRAN-TDD; utran-cell-id
34、-3gpp=0010100010000000P-Preferred-Identity: Allow: INVITE,ACK,CANCEL,BYE,UPDATE,PRACK,MESSAGE,REFER,NOTIFY,INFOc: application/sdpAccept: application/sdp,application/3gpp-ims+xmlP-Preferred-Service: urn:urn-7:3gpp-service.ims.icsi.mmtela: *;+g.3gpp.icsi-ref=“urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel“
35、;audiok: 100rel,replaces,from-changeP-Early-Media: supportedl: 435v=0o=root 5000 1000 IN IP4 192.168.1.1s=QC VOIPc=IN IP4 192.168.1.1t=0 0m=audio 50010 RTP/AVP 104 102 105 100b=AS:41b=RS:0b=RR:0a=rtpmap:104 AMR-WB/16000a=fmtp:104 mode-change-capability=2;max-red=0a=rtpmap:102 AMR/8000a=fmtp:102 mode
36、-change-capability=2;max-red=0a=rtpmap:105 telephone-event/16000a=fmtp:105 0-15a=rtpmap:100 telephone-event/8000a=fmtp:100 0-15a=sendrecva=maxptime:240a=ptime:20SIP/2.0 100 TryingVia: SIP/2.0/UDP 192.168.1.1:5060;branch=z9hG4bK3624637363Max-Forwards: 70From: “18406630020“ ;tag=561128308To: Call-ID:
37、561128295_185090136192.168.1.1CSeq: 561128295 INVITEContent-Length: 0SIP/2.0 180 RingingMax-Forwards: 70Via: SIP/2.0/UDP 192.168.1.1:5060;branch=z9hG4bK3624637363From: “18406630020“ ;tag=561128308To: ;tag=1111111111Call-ID: 561128295_185090136192.168.1.1CSeq: 561128295 INVITEAllow: INVITE, ACK, CANC
38、EL, BYE, PRACK, UPDATERecord-Route: Require: 100relSupported: preconditionSupported: 100relRSeq: 1Privacy: noneUser-Agent: Anritsu-VirtualUA/4596Content-Length: 0Contact: P-Asserted-Identity: PRACK sip:0123456789192.168.1.2:55379;transport=udp SIP/2.0Max-Forwards: 70From: “18406630020“ ;tag=56112830
39、8To: ;tag=1111111111Call-ID: 561128295_185090136192.168.1.1CSeq: 561128296 PRACKUser-Agent: Anritsu-VirtualUA/4596Content-Length: 0v: SIP/2.0/UDP 192.168.1.1:5060;branch=z9hG4bK4129161699P-Access-Network-Info: 3GPP-E-UTRAN-TDD; utran-cell-id-3gpp=0010100010000000RAck: 1 561128295 INVITERoute: SIP/2.
40、0 200 OKMax-Forwards: 70Via: SIP/2.0/UDP 192.168.1.1:5060;branch=z9hG4bK4129161699From: “18406630020“ ;tag=561128308To: ;tag=1111111111Call-ID: 561128295_185090136192.168.1.1CSeq: 561128296 PRACKAllow: INVITE, ACK, CANCEL, BYE, PRACK, UPDATERecord-Route: Supported: 100relUser-Agent: Anritsu-VirtualU
41、A/4596Content-Length: 0Contact: SIP/2.0 200 OKMax-Forwards: 70Via: SIP/2.0/UDP 192.168.1.1:5060;branch=z9hG4bK3624637363From: “18406630020“ ;tag=561128308To: ;tag=1111111111Call-ID: 561128295_185090136192.168.1.1CSeq: 561128295 INVITEAllow: INVITE, ACK, CANCEL, BYE, PRACK, UPDATERecord-Route: User-A
42、gent: Anritsu-VirtualUA/4596Content-Type: application/sdpContent-Length: 465Contact: v=0o=anritsu 853 671855 IN IP4 192.168.1.2s=-i=A VOIP Sessionc=IN IP4 192.168.1.2t=0 0m=audio 60000 RTP/AVP 104 102 105 100b=AS:41b=RS:0b=RR:0a=rtpmap:104 AMR-WB/16000a=fmtp:104 mode-change-capability=2;max-red=0a=r
43、tpmap:102 AMR/8000a=fmtp:102 mode-change-capability=2;max-red=0a=rtpmap:105 telephone-event/16000a=fmtp:105 0-15a=rtpmap:100 telephone-event/8000a=fmtp:100 0-15a=sendrecva=maxptime:240a=ptime:20a=rtcp:60001ACK sip:0123456789192.168.1.2:55379;transport=udp SIP/2.0Max-Forwards: 70Via: SIP/2.0/UDP 192.
44、168.1.1:5060;branch=z9hG4bK901577778From: “18406630020“ ;tag=561128308To: ;tag=1111111111Call-ID: 561128295_185090136192.168.1.1CSeq: 561128295 ACKContent-Length: 0Route: BYE sip:0123456789192.168.1.2:55379;transport=udp SIP/2.0t: ;tag=1111111111f: “18406630020“ ;tag=561128308i: 561128295_1850901361
45、92.168.1.1CSeq: 561128297 BYEv: SIP/2.0/UDP 192.168.1.1:5060;branch=z9hG4bK3262761237Max-Forwards: 70P-Access-Network-Info: 3GPP-E-UTRAN-TDD; utran-cell-id-3gpp=0010100010000000l: 0Route: P-Preferred-Identity: SIP/2.0 200 OKMax-Forwards: 70Via: SIP/2.0/UDP 192.168.1.1:5060;branch=z9hG4bK3262761237Fr
46、om: “18406630020“ ;tag=561128308To: ;tag=1111111111Call-ID: 561128295_185090136192.168.1.1CSeq: 561128297 BYEAllow: INVITE, ACK, CANCEL, BYE, PRACK, UPDATERecord-Route: Privacy: noneUser-Agent: Anritsu-VirtualUA/4596Content-Length: 0Contact: P-Asserted-Identity: 3. 被叫流程SIP 消息:Request:INVITE sip:0010
47、10123456789192.168.1.1:5060Status:100 TryingStatus:SIP/2.0 180 RingingStatus:SIP/2.0 200 OKRequest: BYE sip:001010123456789192.168.1.1:5060Status: SIP/2.0 200 OK说明:NW MS 网络寻呼 sip:001010123456789ims.mnc001.mcc001.3gppnetwork.orgMS NW 手机回复 100 TryingMS NW 手机回复 180 Ringing,振铃MS NW 手机回复 200 OK,应答,被叫建立.
48、. 通话中 . .NW MS 网络发 BYE 挂机MS NW 手机回复 200 OK,挂断电话空口消息如下:DL RRC CONNECTION RECONFIGURATIONUL RRC CONNECTION RECONFIGURATION COMPLETEUL ESM: ACTIVATE DEDICATED EPS BEARER CONTEXT ACCEPT /专用承载建立DL RRC CONNECTION RECONFIGURATIONUL RRC CONNECTION RECONFIGURATION COMPLETEUL ESM: DEACTIVATE EPS BEARER CONTEX
49、T ACCEPT /恢复默认承载具体的 SIP 消息:INVITE sip:001010123456789192.168.1.1:5060 SIP/2.0Via: SIP/2.0/UDP 192.168.1.2:60124;branch=z9hG4bKe9f77cafd88b452dab9752198ad5e94f28;rport;transport=udpVia: SIP/2.0/UDP 192.168.1.2:60115;branch=z9hG4bKf3b6a856a57d467e9437f54d214995ea21dbba51Max-Forwards: 69Call-ID: c64488da3d6644409c0b6324e3cd911cCSeq: 9001 IN