【VOLTE案例解析】南京移动拨打10086回落到2G，拨打其他电话正常使用VOLTE

来源：互联网发布：安卓拼长图软件哪个好编辑：程序博客网时间：2024/04/30 07:54

2016.1.15日，使用南京移动卡拨打10086发现回落到2G网络，无法正常使用VOLTE网络。而这之前拨打10086都可以使用10086网络。使用手机拨打其他手机/固话，终端可正常拨打10086。

通过抓取网络发现，当终端发起10086电话后，被网络当紧急号码拒绝，指示终端进行回落的方式拨打

2016 Jan 15  07:27:38.420  [66]  0x156E  IMS SIP Message--终端发起呼叫

Version = 1

Direction = UE_TO_NETWORK

SDP Presence = 1

SIP Call ID Length = 60

SIP Message Length = 1933

SIP Message Logged Bytes = 1934

Message ID = IMS_SIP_INVITE

Response Code = INFORMAL_RESPONSE (0)

CM Call ID = 3

SIP Call ID = 3006692261_2325325544@2409:8095:401:1de:b694:c1ee:a9fa:e09d

Sip Message = INVITE tel:10086;phone-context=ims.mnc000.mcc460.3gppnetwork.org SIP/2.0

f: ;tag=3006692270

t:

CSeq: 859208613 INVITE

2016 Jan 15  07:27:38.526  [DB]  0x156E  IMS SIP Message--被网络拒绝

Version = 1

Direction = NETWORK_TO_UE

SDP Presence = 0

SIP Call ID Length = 60

SIP Message Length = 823

SIP Message Logged Bytes = 824

Message ID = IMS_SIP_INVITE

Response Code = ALTERNATIVE_SERVICE (380)--被网络拒绝，CODE=380

CM Call ID = 3

SIP Call ID = 3006692261_2325325544@2409:8095:401:1de:b694:c1ee:a9fa:e09d

Sip Message = SIP/2.0 380 Alternative Service

Via: SIP/2.0/TCP [2409:8095:0401:01DE:B694:C1EE:A9FA:E09D]:8911;branch=z9hG4bK2640280275

Call-ID: 3006692261_2325325544@2409:8095:401:1de:b694:c1ee:a9fa:e09d

From: ;tag=3006692270

To: ;tag=fqldqdbl

CSeq: 859208613 INVITE

Warning: 399 00000.00000.A.005.415.228.0.20.05742.00000000 "Common emergency call rejected"---网络显示终端发起的是普通呼叫，被网络拒绝

P-Asserted-Identity:

Content-Length: 214

Content-Type: application/3gpp-ims+xml

                emergency

          Can't Support Emergency Call,Please retry by other network--指示终端用其他网络进行呼叫

  通过LOG发现终端拨打10086后，被网络拒绝，网络提示"common emergency call rejected"，查看终端信令，终端并没有将10086当做紧急号码进行呼叫，而是普通呼叫。

    找了其他平台的终端，表现一致。初步判定网络设定问题。

终端之后发起ESR，CSFB回落到GSM重新发起呼叫。

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