SIP Maip to add an additional header field.

Have a situation that when sending calls out as Anonymous, telco wants

From: "Anonymous" <sip:anonymous@69.189.141.37>;

.

.

P-Asserted-Identity: "Anonymous" <sip:6992041210@10.15.120.73>

Privacy: id. ******. Add this if From is anonymous

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I was thinking:

header-rule

  name          AddPrivateID

  header-name       From

  action         Add

  comparison-type     case-insensitive

  match-value Anonymous

  msg-type        request

  new-value

  methods         INVITE

  element-rule

    name        InsertPrivateID 

    parameter-name Private

    type        uri-user 

    action       add 

    match-val-type   any 

    comparison-type   

    match-value 

    new-value      id