P-Associated-URI是在用户注册成功时,S-CSCF在200 OK响应中将与当前注册的公有标识属于同一个隐式注册集的用户标识放在P-Associated-URI头域中发送给UE。 P-Preferred-Identity是主叫发起会话时希望被叫与其联系时使用的公有标识,当P-Preferred-Identity经过网络认证通过时就是P-Asserted-Identity
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In registration:
P-Associated-URI: in 200 OK response to REGISTER, it lists all the associated IMPUs of a user. The first URI in P-Associated-URI is the default IMPU and always a valid, registered one.
P-Preferred-Identify: in SUBSCRIBE from UE to P-CSCF.
P-Asserted-Identify: in SUBSCRIBE from P-CSCF to S-CSCF, it replaces the P-Preferred-Identify if it is a valid IMPU of the user
In session:
P-Preferred-Identify: in INVITE from UE1 to P-CSCF1, in 183 (session in process) from UE2 to P-CSCF2.
P-Asserted-Identify: in INVITE request or 183 response from P-CSCF to S-CSCF, replaces P-Preferred-Identify in case of valid IMPU