| 3 | RFC3311/UPDATE itself doesn't seem to specify anything about updating dialog route set (in early dialog), however this specification may be applicable here, http://tools.ietf.org/html/rfc3261#section-12.2: |
| 4 | {{{ |
| 5 | Requests within a dialog MAY contain Record-Route and Contact header |
| 6 | fields. However, these requests do not cause the dialog's route set |
| 7 | to be modified, although they may modify the remote target URI. |
| 8 | ... |
| 9 | Target refresh requests only update the dialog's remote target URI, |
| 10 | and not the route set formed from the Record-Route. |
| 11 | }}} |
| 12 | |