手機在lte only 沒有"hd"標志，上網(wǎng)正常，看不到ims注刪信令

log ：

[0xB0ED] | OTA LOG | 2017/03/30 06:22:49.000 | LTE NAS EMM Plain OTA Outgoing Message | 

UE_usage_setting = 0 (0x0) (Voice centric)

voice_domain_pref_for_EUTRAN = 3 (0x3) (IMS PS Voice preferred, CS Voice as secondary)

[0xB0EC] | OTA LOG | 2017/03/30 06:22:49.239 | LTE NAS EMM Plain OTA Incoming Message | Attach accept Msg |  | 

 IMSVoPS = 0 (0x0) (IMS Vo PS Session in S1 Mode not supported)

手機在global模式下，有"hd"標志，上網(wǎng)正常，volte正常，能看到ims注刪信令

[0xB0ED] | OTA LOG | 2017/03/30 06:27:03.603 | LTE NAS EMM Plain OTA Outgoing Message | Attach request Msg |  | 

UE_usage_setting = 0 (0x0) (Voice centric)

voice_domain_pref_for_EUTRAN = 3 (0x3) (IMS PS Voice preferred, CS Voice as secondary)

[0xB0EC] | OTA LOG | 2017/03/30 06:27:04.040 | LTE NAS EMM Plain OTA Incoming Message | Attach accept Msg |  | 

IMSVoPS = 1 (0x1) (IMS Vo PS Session in S1 Mode supported)

這是網(wǎng)絡限制，還是終端的bug

上海同個版本手機正常。兩種模式下。

支持VOLTE通話時，終端需開啟“數(shù)據(jù)+語音”模式；各品牌的操作方式可能不同，你可看一下說明。。