Aastra Telecom 675xi Series - Manual (Page 15)

New Features in Release 2.4
RN-001029-03, Release 2.4, Rev 00 11
SIP IP Phone Models 9143i, 9480i, 9480i CT, and 675xi Series Phones Release Note 2.4
Support for Early-Only Parameter in Replaces Header RFC3891
The phones now support the early-only parameter in the “Replaces” header according to
RFC3891. When the phone receives a Replaces header with the early-only parameter, it replaces
the existing dialog if the call is still in the early state. If the call has been answered, then the
Replaces request is rejected.
P-Preferred Identity Header for BLA Accounts
Release 2.4 now supports the BLA specification, draft-anil-sipping-bla-02, which states that the
P-Preferred-Identity header (RFC3325) gets added to the INVITE message to indicate the
Caller-ID that is used for the call.
Note: This feature is not supported in outgoing requests.
Note: The P-Preferred-Identity for BLA accounts is also sent for hold/
unhold messages.