lte语音业务-CSFB
一 相关概念
我们知道，2g网络存在ps域 与cs域分别为 GPRS GSM网络，3g没有区分ps cs，4g的域变成了IMS 和 EPC
lte网络语音解决方案有如下几种
| 方案 | 特点 |
|---|---|
| 双通双待 | 两套收发器，分别驻留lte网络和2g/3g网络 |
| CSFB | 回落到2g或者3g网络 |
| volte | ims域，4g高清语音 |
| ott | 类似微信的语音通信方式 |
关于cs ps ims域介绍
cs 电路交换域，用于语音通信
ps 分组交换域 用于数据通信
ims 多媒体子系统，支持语音业务
本文主要介绍下CSFB相关内容,至于volte后面再说
现在终端如果使用4g网络，并且不支持volte，如何进行语音业务呢，那就采用回落到2g/3g网络的cs域进行语音业务。
但是终端要支持CSFB必须有一下条件：
1.终端所在区域重叠覆盖4g网络和2g/3g网络
2.终端要同时支持4g网络和2g/3g网络
注：lte的MME通过SGs接口与2G/3G的MSC-S通信
二 lte注册log分析
本文使用高通的qxdmlog分析
分析qxdm log之前先说几个概念
1.联合附着类型
lte网络附着前面我已经说过了，这里解释下lte附着方式(EPS attach type)，相关内容在attach request中
分为下面几种方式：
| 类型（取值） | 含义 |
|---|---|
| EPS Attach（001） | 普通附着 |
| combined EPS/IMSI attach（010） | 联合附着 |
| EPS Emergency attach（110） | 紧急附着 |
| 保留位（111） | 保留 |
2.UE’s Usage Setting
次参数关系到联合附着失败后，采用何种方式来支持语音业务。
| 类型（取值） | 说明 |
|---|---|
| voice centric（0） | 语音业务为主，联合附着失败，转到2G/3G网络重新发起附着 |
| data centric（1） | 数据业务为主，联合附着失败，只能支持volte语音 |
3.voice domain preference
用于配置优先选择哪个语音域
| 类型（取值） | 说明 |
|---|---|
| CS voice Only（00） | 仅支持CSFB |
| IMS PS Voice only（01） | 仅支持volte |
| CS Voice Preferred,IMS PS Voice as Secondary（10） | 优先支持CSFB，其次volte |
| IMS PS Voice preferred, CS Voice as secondary（11） | 优先支持volte，其次CSFB |
下面重点说下上述内容在qxdm log中的说明
attach request
07:42:25.220 [0xB0ED] LTE NAS EMM Plain OTA Outgoing Message
pkt_version = 1 (0x1)
rel_number = 9 (0x9)
rel_version_major = 5 (0x5)
rel_version_minor = 0 (0x0)
security_header_or_skip_ind = 0 (0x0)
prot_disc = 7 (0x7) (EPS mobility management messages)
msg_type = 65 (0x41) (Attach request)
lte_emm_msgemm_attach_requesttsc = 0 (0x0) (cached sec context)nas_key_set_id = 3 (0x3)att_type = 2 (0x2) (combined EPS/IMSI attach) //联合附着方式 eps_mob_id //终端用户标识id_type = 6 (0x6) (GUTI)odd_even_ind = 0 (0x0)Guti_1111 = 15 (0xf)mcc_1 = 4 (0x4)mcc_2 = 6 (0x6)mcc_3 = 0 (0x0)mnc_3 = 15 (0xf)mnc_1 = 0 (0x0)mnc_2 = 0 (0x0)MME_group_id = 610 (0x262)MME_code = 242 (0xf2)m_tmsi = 3733388296 (0xde86fc08)ue_netwk_cap //终端安全能力EEA0 = 1 (0x1)EEA1_128 = 1 (0x1)EEA2_128 = 1 (0x1)EEA3_128 = 1 (0x1)EEA4 = 0 (0x0)EEA5 = 0 (0x0)EEA6 = 0 (0x0)EEA7 = 0 (0x0)EIA0 = 0 (0x0)EIA1_128 = 1 (0x1)EIA2_128 = 1 (0x1)EIA3_128 = 1 (0x1)EIA4 = 0 (0x0)EIA5 = 0 (0x0)EIA6 = 0 (0x0)EIA7 = 0 (0x0)oct5_incl = 1 (0x1)UEA0 = 0 (0x0)UEA1 = 0 (0x0)UEA2 = 0 (0x0)UEA3 = 0 (0x0)UEA4 = 0 (0x0)UEA5 = 0 (0x0)UEA6 = 0 (0x0)UEA7 = 0 (0x0)oct6_incl = 1 (0x1)UCS2 = 0 (0x0)UIA1 = 0 (0x0)UIA2 = 0 (0x0)UIA3 = 0 (0x0)UIA4 = 0 (0x0)UIA5 = 0 (0x0)UIA6 = 0 (0x0)UIA7 = 0 (0x0)oct7_incl = 1 (0x1)ProSedd = 0 (0x0)ProSe = 0 (0x0)H_245_ASH = 0 (0x0)ACC_CSFB = 1 (0x1)LPP = 0 (0x0)LCS = 0 (0x0)vcc_1xsr = 0 (0x0)NF = 1 (0x1)oct8_incl = 0 (0x0)oct9_incl = 0 (0x0)oct10_incl = 0 (0x0)oct11_incl = 0 (0x0)oct12_incl = 0 (0x0)oct13_incl = 0 (0x0)oct14_incl = 0 (0x0)oct15_incl = 0 (0x0)esm_msg_containereps_bearer_id_or_skip_id = 0 (0x0)prot_disc = 2 (0x2) (EPS session management messages)trans_id = 5 (0x5)msg_type = 208 (0xd0) (PDN connectivity request) //pdn connectivity requestlte_esm_msg //lte网络pdn_connectivity_req //PDN 连接请求消息pdn_type = 3 (0x3) (Ipv4v6)req_type = 1 (0x1) (initial request)info_trans_flag_incl = 0 (0x0)access_pt_name_incl = 0 (0x0)prot_config_incl = 1 (0x1)prot_configext = 1 (0x1)conf_prot = 0 (0x0)num_recs = 5 (0x5)sm_prot[0]protocol_id = 32801 (0x8021) (IPCP)prot_len = 16 (0x10)ipcp_protipcp_prot_id = 1 (0x1) (CONF_REQ)identifier = 0 (0x0)rfc1332_conf_reqnum_options = 2 (0x2)conf_options[0]type = 129 (0x81)rfc1877_primary_dns_server_addlength = 6 (0x6)ip_addr = 0 (0x0) (0.0.0.0)conf_options[1]type = 131 (0x83)rfc1877_sec_dns_server_addlength = 6 (0x6)ip_addr = 0 (0x0) (0.0.0.0)sm_prot[1]protocol_id = 13 (0xd) (DNS Server IPv4 Address Requestt)prot_len = 0 (0x0)sm_prot[2]protocol_id = 3 (0x3) (DNS Server IPv6 Addr Req)prot_len = 0 (0x0)sm_prot[3]protocol_id = 10 (0xa) (IP address allocation via NAS signalling)prot_len = 0 (0x0)sm_prot[4]protocol_id = 5 (0x5) (NWK Req Bearer Control indicator)prot_len = 0 (0x0)num_recs2 = 1 (0x1)sm_container[0]container_id = 16 (0x10) (Ipv4 Link MTU Request)container_len = 0 (0x0)dev_properties_incl = 0 (0x0)nbifom_incl = 0 (0x0)header_compression_config_inclu = 0 (0x0)ext_prot_config_incl = 0 (0x0)p_tmsi_sig_incl = 0 (0x0)add_guti_incl = 0 (0x0)reg_tai_incl = 1 (0x1)tracking_area_id //TAI mcc_mncmcc_1 = 4 (0x4)mcc_2 = 6 (0x6)mcc_3 = 0 (0x0)mnc_3 = 15 (0xf)mnc_1 = 0 (0x0)mnc_2 = 0 (0x0)tracking_area_id = 6150 (0x1806)drx_params_incl = 1 (0x1)drx_paramssplit_pg_cycle_code = 10 (0xa)cycle_len_coeff = 0 (0x0)split_on_ccch = 0 (0x0)non_drx_timer = 0 (0x0)ms_netwk_cap_incl = 1 (0x1)ms_netwk_cap //GSM 终端能力length = 3 (0x3)r99 = 1 (0x1)GEA1 bitsGEA/1 = 1 (0x1)SM capabilities via dedicated channels = 1 (0x1)SM capabilities via GPRS channels = 1 (0x1)UCS2 support = 0 (0x0)SS Screening Indicator = 1 (0x1)SoLSA Capability = 0 (0x0)Revision level indicator = 1 (0x1)PFC feature mode = 1 (0x1)Extended GEA bitsGEA/2 = 1 (0x1)GEA/3 = 1 (0x1)GEA/4 = 0 (0x0)GEA/5 = 0 (0x0)GEA/6 = 0 (0x0)GEA/7 = 0 (0x0)LCS VA capability = 0 (0x0)PS inter-RAT HO from GERAN to UTRAN Iu mode capability = 0 (0x0)PS inter-RAT HO from GERAN to E-UTRAN S1 mode capability = 0 (0x0)EMM Combined procedures Capability = 1 (0x1)ISR support = 1 (0x1)SRVCC to GERAN/UTRAN capability = 1 (0x1)EPC capability = 1 (0x1)NF capability = 1 (0x1)spare_bits0_count = 0 (0x0)old_loc_area_id_incl = 1 (0x1)old_loc_area_idmcc_1 = 4 (0x4)mcc_2 = 6 (0x6)mcc_3 = 0 (0x0)mnc_3 = 15 (0xf)mnc_1 = 0 (0x0)mnc_2 = 0 (0x0)loc_area_code = 6150 (0x1806)tmsi_stat_incl = 0 (0x0)ms_class_mark2_incl = 1 (0x1)ms_class_mark2rev_level = 2 (0x2)es_ind = 1 (0x1)a5_1_alg_sup = 0 (0x0)rf_power_cap = 7 (0x7)pseudo_sync_cap = 1 (0x1)ss_screen_ind = 1 (0x1)sm_cap = 1 (0x1)vbs = 0 (0x0)vgcs = 0 (0x0)freq_cap = 0 (0x0)class_3_avail = 1 (0x1)lcsva_cap = 1 (0x1)ucs2 = 0 (0x0)solsa = 0 (0x0)cmsp = 1 (0x1)a5_3_alg_sup = 1 (0x1)a5_2_alg_sup = 0 (0x0)ms_class_mark3_incl = 1 (0x1)ms_class_mark3spare_bit0 = 0 (0x0)const_110 = 6 (0x6)A5 bits structA5/7 = 0 (0x0)A5/6 = 0 (0x0)A5/5 = 0 (0x0)A5/4 = 0 (0x0)Associated Radio Capability 2 = 1 (0x1)Associated Radio Capability 1 = 4 (0x4)r_support_present = 0 (0x0)hscsd_multi_slot_capability_present = 0 (0x0)UCS2 treatment = 0 (0x0)Extended Measurement Capability = 0 (0x0)ms_measurement_capability_present = 0 (0x0)ms_positioning_method_capability_present = 1 (0x1)MS Positioning Method CapabilityMS Positioning Method = 1 (0x1)ecsd_multi_slot_capability_present = 0 (0x0)gsm_8_psk_struct_present = 0 (0x0)gsm_400_bands_supported_present = 0 (0x0)gsm_850_associated_radio_capability_present = 1 (0x1)GSM 850 Associated Radio Capability = 4 (0x4)gsm_1900_associated_radio_capability_present = 1 (0x1)GSM 1900 Associated Radio Capability = 1 (0x1)UMTS FDD Radio Access Technology Capability = 0 (0x0)UMTS 3.84 Mcps TDD Radio Access Technology Capability = 0 (0x0)CDMA 2000 Radio Access Technology Capability = 0 (0x0)dtm_gprs_multi_slot_class_present = 0 (0x0)single_band_support_present = 0 (0x0)gsm_750_associated_radio_capability_present = 0 (0x0)UMTS 1.28 Mcps TDD Radio Access Technology Capability = 0 (0x0)GERAN Feature Package 1 = 1 (0x1)extended_dtm_gprs_multi_slot_class_present = 0 (0x0)high_multislot_capability_present = 0 (0x0)geran_iu_mode_capabilities_present = 0 (0x0)GERAN Feature Package 2 = 0 (0x0)GMSK Multislot Power Profile = 0 (0x0)gsm 8-PSK Multislot Power Profile = 3 (0x3)t_gsm_400_bands_supported_present = 0 (0x0)t_gsm_900_associated_radio_capability_present = 0 (0x0)Downlink Advanced Receiver Performance = 1 (0x1)DTM Enhancements Capability = 0 (0x0)dtm_gprs_high_multi_slot_class_present = 0 (0x0)Repeated ACCH Capability = 1 (0x1)gsm_710_associated_radio_capability_present = 0 (0x0)t_gsm_810_associated_radio_capability_present = 0 (0x0)Ciphering Mode Setting Capability = 0 (0x0)Additional Positioning Capabilities = 0 (0x0)E-UTRA FDD support = 1 (0x1)E-UTRA TDD support = 1 (0x1)E-UTRA Measurement and Reporting support = 1 (0x1)Priority-based reselection support = 1 (0x1)UTRA CSG Cells Reporting = 0 (0x0)VAMOS Level = 1 (0x1)spare_bits0_count = 1 (0x1)spare_bits0 = 0 (0x0)supp_codecs_incl = 1 (0x1)supp_codecsnum_codecs = 2 (0x2)codecs[0]sysid = 4 (0x4)length = 2 (0x2)bitmap[0] = 96 (0x60)bitmap[1] = 4 (0x4)codecs[1]sysid = 0 (0x0)length = 2 (0x2)bitmap[0] = 31 (0x1f)bitmap[1] = 2 (0x2)add_update_type_incl = 0 (0x0)voice_domain_pref_incl = 1 (0x1)voice_domain_pref //语音域的特性length = 1 (0x1)UE_usage_setting = 1 (0x1) (Data centric) //数据优先voice_domain_pref_for_EUTRAN = 3 (0x3) (IMS PS Voice preferred, CS Voice as secondary) //语音优先volte，CSFB次之dev_properties_incl = 0 (0x0)old_guti_incl = 1 (0x1)old_gutiguti_type = 0 (0x0) (Native GUTI) //guti 类型ms_network_feature_incl = 1 (0x1)ms_network_feature_supportext_periodic_timers = 1 (0x1)network_resource_id_container_incl = 0 (0x0)t3324_incl = 0 (0x0)t3412_ext_incl = 0 (0x0)ext_drx_par_incl = 0 (0x0)ue_add_security_cap_incl = 0 (0x0)ue_status_incl = 0 (0x0)
我们从上面attach request中可以得到有关语音相关信息如下
注册lte 网络plmn为 460 00，采用联合附着方式，优先数据业务，关于语音特性，优先volte语音，CSFB次之。
Attach Accept 消息
07:42:25.490 [0xB0EC] LTE NAS EMM Plain OTA Incoming Message
pkt_version = 1 (0x1)
rel_number = 9 (0x9)
rel_version_major = 5 (0x5)
rel_version_minor = 0 (0x0)
security_header_or_skip_ind = 0 (0x0)
prot_disc = 7 (0x7) (EPS mobility management messages)
msg_type = 66 (0x42) (Attach accept)
lte_emm_msgemm_attach_acceptattach_result = 2 (0x2) (comb EPS/IMSI attach) //附着结果t3412 //GPRS timer，控制周期性位置更新定时器unit = 2 (0x2)timer_value = 9 (0x9)tai_list //TAI listnum_tai_list = 1 (0x1)tai_list[0]list_type = 0 (0x0)num_element = 0 (0x0)mcc_mncmcc_1 = 4 (0x4)mcc_2 = 6 (0x6)mcc_3 = 0 (0x0)mnc_3 = 15 (0xf)mnc_1 = 0 (0x0)mnc_2 = 0 (0x0)tac[0] = 6150 (0x1806)esm_msg_containereps_bearer_id_or_skip_id = 5 (0x5)prot_disc = 2 (0x2) (EPS session management messages)trans_id = 5 (0x5)msg_type = 193 (0xc1) (Activate default EPS bearer context request) //atcivate default eps bearer context 请求lte_esm_msgact_def_eps_bearer_context_reqeps_qosqci = 9 (0x9) (QC9)oct4_incl = 0 (0x0)oct5_incl = 0 (0x0)oct6_incl = 0 (0x0)oct7_incl = 0 (0x0)oct8_incl = 0 (0x0)oct9_incl = 0 (0x0)oct10_incl = 0 (0x0)oct11_incl = 0 (0x0)oct12_incl = 0 (0x0)oct13_incl = 0 (0x0)oct14_incl = 0 (0x0)oct15_incl = 0 (0x0)access_point // APN信息 CMNET num_acc_pt_val = 25 (0x19)acc_pt_name_val[0] = 5 (0x5) (length)acc_pt_name_val[1] = 99 (0x63) (c)acc_pt_name_val[2] = 109 (0x6d) (m)acc_pt_name_val[3] = 110 (0x6e) (n)acc_pt_name_val[4] = 101 (0x65) (e)acc_pt_name_val[5] = 116 (0x74) (t)acc_pt_name_val[6] = 6 (0x6) (length)acc_pt_name_val[7] = 109 (0x6d) (m)acc_pt_name_val[8] = 110 (0x6e) (n)acc_pt_name_val[9] = 99 (0x63) (c)acc_pt_name_val[10] = 48 (0x30) (0)acc_pt_name_val[11] = 48 (0x30) (0)acc_pt_name_val[12] = 50 (0x32) (2)acc_pt_name_val[13] = 6 (0x6) (length)acc_pt_name_val[14] = 109 (0x6d) (m)acc_pt_name_val[15] = 99 (0x63) (c)acc_pt_name_val[16] = 99 (0x63) (c)acc_pt_name_val[17] = 52 (0x34) (4)acc_pt_name_val[18] = 54 (0x36) (6)acc_pt_name_val[19] = 48 (0x30) (0)acc_pt_name_val[20] = 4 (0x4) (length)acc_pt_name_val[21] = 103 (0x67) (g)acc_pt_name_val[22] = 112 (0x70) (p)acc_pt_name_val[23] = 114 (0x72) (r)acc_pt_name_val[24] = 115 (0x73) (s)pdn_addr //分配的pdn地址pdn_addr_len = 13 (0xd)pdn_type = 3 (0x3) (IPv4v6)ipv6_interface_id = 0x83d26b12ad5af20d (83d2:6b12:ad5a:f20d)ipv4_addr = 180244164 (0xabe4ec4) (10.190.78.196)trans_id_incl = 1 (0x1)trans_idlength = 1 (0x1)ti_flag = 0 (0x0)ti_value = 0 (0x0)qos_incl = 1 (0x1)qosdelay_class = 4 (0x4) (Delay class 4 (best effort))reliability_class = 3 (0x3) (Unacknowledged GTP and LLC; Acknowledged RLC, Protected data)peak_throughput = 9 (0x9) (Up to 256 000 octet/s)precedence_class = 3 (0x3) (Low priority)mean_throughput = 31 (0x1f) (Best effort)traffic_class = 4 (0x4) (Background class)delivery_order = 2 (0x2) (Without delivery order ('no'))delivery_err_sdu = 3 (0x3) (Erroneous SDUs are not delivered ('no'))max_sdu_size = 150 (0x96) (1500 octets)max_bitrate_uplink = 254 (0xfe) (8640 kbps)max_bitrate_downlink = 254 (0xfe) (8640 kbps)residual_ber = 7 (0x7) (1*10^(-5))sdu_error_ratio = 4 (0x4) (1*10^(-4))transfer_delay = 18 (0x12) (300 ms)traffic_hand_pri = 3 (0x3) (Priority level 3)guar_bitrate_uplink = 255 (0xff) (0kbps)guar_bitrate_downlink = 255 (0xff) (0kbps)signalling_ind = 0 (0x0) (Not optimised for signalling traffic)source_stat_desc = 0 (0x0) (spare)downlink_ext_incl = 1 (0x1)max_bitrate_downlink_ext = 250 (0xfa) (256 Mbps)guar_bitrate_downlink_ext = 0 (0x0) (Use value in oct 13)uplink_ext_incl = 1 (0x1)max_bitrate_uplink_ext = 133 (0x85) (75 Mbps)guar_bitrate_uplink_ext = 0 (0x0) (Use value in oct 12)llc_sapi_incl = 1 (0x1)llc_sapillc_sapi_value = 11 (0xb)radio_priority_incl = 1 (0x1)radio_priorityradio_pri_val = 4 (0x4)pkt_flow_id_incl = 1 (0x1)pkt_flow_idlength = 1 (0x1)packet_flow_id = 8 (0x8)apn_ambr_incl = 1 (0x1)apn_ambrapn_ambr_dl = 254 (0xfe) (8640 kbps)apn_ambr_ul = 254 (0xfe) (8640 kbps)oct5_incl = 1 (0x1)apn_ambr_dl_ext = 102 (0x66) (44 Mbps)oct6_incl = 1 (0x1)apn_ambr_ul_ext = 133 (0x85) (75 Mbps)oct7_incl = 1 (0x1)apn_ambr_dl_ext2 = 1 (0x1) (308.640000 Mbps)oct8_incl = 1 (0x1)apn_ambr_ul_ext2 = 0 (0x0) (Use value in oct 4 and oct 6)esm_cause_incl = 0 (0x0)prot_config_incl = 1 (0x1)prot_configext = 1 (0x1)conf_prot = 0 (0x0)num_recs = 1 (0x1)sm_prot[0]protocol_id = 32801 (0x8021) (IPCP)prot_len = 16 (0x10)ipcp_protipcp_prot_id = 3 (0x3) (CONF_NAK)identifier = 0 (0x0)rfc1332_conf_naknum_options = 2 (0x2)conf_options[0]type = 129 (0x81)rfc1877_primary_dns_server_addlength = 6 (0x6)ip_addr = 3548934194 (0xd3887032) (211.136.112.50)conf_options[1]type = 131 (0x83)rfc1877_sec_dns_server_addlength = 6 (0x6)ip_addr = 3548943938 (0xd3889642) (211.136.150.66)num_recs2 = 6 (0x6)sm_container[0]container_id = 3 (0x3) (DNS Server IPv6 Address)container_len = 16 (0x10)address = 0x2409801e200000000000000000000001 (2409:801e:2000:0:0:0:0:1)sm_container[1]container_id = 3 (0x3) (DNS Server IPv6 Address)container_len = 16 (0x10)address = 0x2409801e200000000000000000000002 (2409:801e:2000:0:0:0:0:2)sm_container[2]container_id = 13 (0xd) (DNS Server IPv4 Address)container_len = 4 (0x4)container_contents[0] = 211 (0xd3)container_contents[1] = 136 (0x88)container_contents[2] = 112 (0x70)container_contents[3] = 50 (0x32)sm_container[3]container_id = 13 (0xd) (DNS Server IPv4 Address)container_len = 4 (0x4)container_contents[0] = 211 (0xd3)container_contents[1] = 136 (0x88)container_contents[2] = 150 (0x96)container_contents[3] = 66 (0x42)sm_container[4]container_id = 5 (0x5) (Selected Bearer Control Mode)container_len = 1 (0x1)container_contents[0] = 2 (0x2)sm_container[5]container_id = 16 (0x10) (Ipv4 Link MTU Request)container_len = 2 (0x2)container_contents[0] = 5 (0x5)container_contents[1] = 220 (0xdc)connectivity_type_incl = 0 (0x0)wlan_offload_acceptability_incl = 0 (0x0)nbifom_incl = 0 (0x0)header_compression_config_inclu = 0 (0x0)ctrl_plane_only_ind_incl = 0 (0x0)ext_prot_config_incl = 0 (0x0)serv_plmn_rate_ctrl_incl = 0 (0x0)ext_apn_ambr_incl = 0 (0x0)ext_eps_qos_incl = 0 (0x0)guti_incl = 1 (0x1)guti //mme 分配的gutiid_type = 6 (0x6) (GUTI)odd_even_ind = 0 (0x0)Guti_1111 = 15 (0xf)mcc_1 = 4 (0x4)mcc_2 = 6 (0x6)mcc_3 = 0 (0x0)mnc_3 = 15 (0xf)mnc_1 = 0 (0x0)mnc_2 = 0 (0x0)MME_group_id = 610 (0x262)MME_code = 242 (0xf2)m_tmsi = 3733388324 (0xde86fc24) //MSC-S为终端分配的TMSIloc_id_incl = 1 (0x1)loc_area_id //位置区标识LAI=mcc+mnc+lacmcc_1 = 4 (0x4)mcc_2 = 6 (0x6)mcc_3 = 0 (0x0)mnc_3 = 15 (0xf)mnc_1 = 0 (0x0)mnc_2 = 0 (0x0)loc_area_code = 6150 (0x1806)ms_id_incl = 0 (0x0)emm_cause_incl = 0 (0x0)T3402_incl = 0 (0x0)T3423_incl = 0 (0x0)equ_plmns_incl = 0 (0x0)emergnecy_num_list_incl = 0 (0x0)eps_netwk_feature_support_incl = 1 (0x1)eps_netwk_feature_support //网络特性length = 1 (0x1)CPCIoT = 0 (0x0)ERwoPDN = 0 (0x0)ESRPS = 0 (0x0)CS_LCS = 0 (0x0) (No info about support of loc service via cs is available)EPC_LCS = 0 (0x0) (Location Services via EPC not supported)EMC_BS = 0 (0x0) (Emergency bearer services in S1 Mode not supported)IMSVoPS = 1 (0x1) (IMS Vo PS Session in S1 Mode supported)add_update_result_incl = 0 (0x0)t3412_ext_incl = 0 (0x0)t3324_incl = 0 (0x0)ext_drx_par_incl = 0 (0x0)dcn_id_incl = 0 (0x0)sms_srvc_status_incl = 0 (0x0)non_3gpp_access_emerg_num_policy_incl = 0 (0x0)t3448_incl = 0 (0x0)nwk_policy_incl = 0 (0x0)t3447_ext_incl = 0 (0x0)ext_emergency_number_incl = 0 (0x0)cipher_ket_data_incl = 0 (0x0)
从本文中只有了解，如何从log中分析出，我们的终端会使用那种语音业务即可。