基于SEQ拆线原因对VOLTE未接通进行分析,包括常见的终端、无线、核心网问题导致的未接通案例分析
处理建议：按照协议规范升级VOBB终端，使之VOBB终端INVITE信息符合规范。1.2三星终端和彩铃平台配合异常
在发给被叫的invite和update消息中，要求被叫终端完成precondition
Media Attribute (a): curr:qos local sendrecv
| | Media Attribute Fieldname: curr
| | Media Attribute Value: qos local sendrecv
| | Media Attribute (a): curr:qos remote none
| | Media Attribute Fieldname: curr
| | Media Attribute Value: qos remote none
| | Media Attribute (a): des:qos mandatory local sendrecv | | Media Attribute Fieldname: des
| | Media Attribute Value: qos mandatory local sendrecv | | Media Attribute (a): des:qos mandatory remote sendrecv | | Media Attribute Fieldname: des
| | Media Attribute Value: qos mandatory remote sendrecv 但在终端返回的183和update 200ok消息中，终端没有完成承载预留
Media Attribute (a): curr:qos local none
| | Media Attribute Fieldname: curr
| | Media Attribute Value: qos local none
| | Media Attribute (a): curr:qos remote sendrecv
| | Media Attribute Fieldname: curr
| | Media Attribute Value: qos remote sendrecv
| | Media Attribute (a): des:qos mandatory local sendrecv | | Media Attribute Fieldname: des
| | Media Attribute Value: qos mandatory local sendrecv | | Media Attribute (a): des:qos mandatory remote sendrecv | | Media Attribute Fieldname: des
| | Media Attribute Value: qos mandatory remote sendrecv