Hi,

RFC3325/9.1
      Header field         where   proxy   ACK  BYE  CAN  INV  OPT  REG
      ------------         -----   -----   ---  ---  ---  ---  ---  ---
      P-Asserted-Identity           adr     -    o    -    o    o    -

RFC3261/20 says,
      An empty entry in the "where" column indicates that the header
      field may be present in all requests and responses.

According to the above, PAI may be present in responses of INVITE.

And PAI in responses indicates callee's ID.

Regards,
Shinji

On 2019/01/18 22:22, r...@yandex.ru wrote:
Hi everyone

Could some point to the doc or maybe clarify if B is correct in the following.

A sends INVITE to B. There is PAI header, lets say P-Asserted-Identity: "Alice" 
<sip:+1...@hostname.com>

B in reply (SIP/183 and SIP/200) sends for example P-Asserted-Identity: "Bob" 
<sip:+4...@abcd.com>, that means PAI header completely differs from that in INVITE.

A acts like it doesn't see SIP/183, SIP/200.

Please advise if changing of PAI in this case is correct.
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