About this DocumentRN-001029-02, Release 2.3.1, Rev 01 1SIP IP Phone Models 9143i, 9480i, 9480i CT and 5i Series Phones Release Note 2.3.1SIP IP PhoneModels 9143i, 9480i, 9480i CTand 5i Series PhonesRelease Note 2.3.1About this DocumentThis Release Note 2.3.1 provides issues resolved for the 5i Series IP Phones (51i, 53i, 55i, 57i, and57i CT), and the 9143i, 9480i, and 9480i CT IP Phones.For more detailed information about features associated with each phone, and for information onhow to use the phones, see your model-specific SIP IP Phone Installation Guide and the SIP IPPhone User Guide. For detailed information about more advanced features, see the SIP IP PhoneAdministrator Guide.Topics in this release note include:• General Information(release content, hardware supported, bootloader requirements)• New Features in Release 2.3.1• Issues Resolved in Release 2.3.1• Contacting Aastra Telecom Support