1、VOWIFI框架
参考3GPP 23402文档， VOWIFI有如下相关架构设置。
1、S2a信任的WIFI热点
2、S2b非信任WIF热点
3、S2c直联核心WIF热点
目前使用比较多的为S2b非信任WIF热点。
2、EPDG建立过程
//Telephony Log IWLAN拨号
08-30 21:36:34.702857 1347 5131 D ConnectivityService: requestNetwork for uid/pid:1001/2293 activeRequest: null callbackRequest: 173 [NetworkRequest [ REQUEST id=173, [ Transports: CELLULAR Capabilities: IMS&TRUSTED&NOT_VPN Specifier: <TelephonyNetworkSpecifier [mSubId = 1]> Uid: 1001 RequestorUid: 1001 RequestorPkg: com.mediatek.ims UnderlyingNetworks: Null] ]] callback flags: 0 order: 2147483647
08-30 21:36:34.943304 1887 2358 D RILJ : [0539]> SETUP_DATA_CALL,accessNetworkType=IWLAN,isRoaming=false,allowRoaming=true,DataProfile=2/2/0/***/***/***/0/0/0/0/true/64/2/1048575/0/0/true/false,addresses=[],dnses=[],pduSessionId=0,sliceInfo={.noinit = {}},trafficDescriptor={.value = {.dnn = {.value = ims}, .osAppId = {.noinit = {}}}},matchAllRuleAllowed=true [PHONE0]
08-30 21:36:34.945436 1291 1312 I AT : [0] AT> AT+EAPNACT=1,"ims","ims",0,,"dnn=ims",,0 (RIL_CMD_READER_4 tid:510501399808)
08-30 21:36:34.994802 1887 1971 D RILJ : [0539]< SETUP_DATA_CALL DataCallResponse: { cause=0 retry=-1 cid=300 linkStatus=2 protocolType=0 ifname=ccmni0 addresses=[100.116.199.78/32] dnses=[/216.230.147.90, /216.230.128.3] gateways=[/100.116.199.78] pcscf=[/10.217.24.65, /10.218.160.65] mtu=1280 mtuV4=1280 mtu
