【多选题】
A 主叫P-CSCF收到IMS主叫用户的SIP请求消息以后，根据用户注册时保存的S-CSCF的主机名，进行路由分析获取静态配置的主叫S-CSCF的IP地址。
After receives the SIP request from the IMS Caller, the caller P-CSCF an_alyzes the route according to the host name of the S-CSCF saved in registration to obtain the IP address of the caller S-CSCF.
B 主叫P-CSCF收到IMS主叫用户的SIP请求消息以后，根据用户注册时保存的I-CSCF的主机名，进行路由分析获取静态配置的主叫I-CSCF的IP地址。
After receives the SIP request from the IMS Caller, the caller P-CSCF an_alyzes the route according to the host name of the I-CSCF saved in registration to obtain the IP address of the caller I-CSCF.
C 主叫S-CSCF在业务触发完成以后，根据Request-URI进行路由分析获取被叫侧的I-CSCF的IP地址。
When the service is triggered, the caller S-CSCF an_alyzes the route according to Request-URI to obtain the IP address of the called part I-CSCF.
D 主叫S-CSCF在业务触发完成以后，根据Request-URI进行路由分析获取被叫侧的S-CSCF的IP地址。
When the service is triggered, the caller S-CSCF an_alyzes the route according to Request-URI to obtain the IP address of the called part S-CSCF.
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