AASTRA IP Phones: Firmware Unlocks New features
New Release 2.1 for Aastra 5i Series
Aastra Telecom is pleased to announce the availability of a significant new software update for the 5i series of SIP telephones - 53i, 55i, 57i, and 57i CT
Release 2.1 delivers many new features and functionalities, offering increased security and flexibility while enhancing user interfaces and simplifying deployment.
This release includes:
- Transport Layer Security (TLS) and Secure Real Time Transport Protocol (SRTP) support
- Full interoperability with Sylantro’s SIP-B feature set
- Further interoperability enhancements for Broadfsoft’s Broadworks ® platforms
- Additional downloading protocols supported via DHCP option 66: HTTP, HTTPS, FTP and TFTP
- Enhanced usability allowing quick speed-dial setup via Phone User Interface
- Additional XML enhancements including new options and functionalities for XML objects and softkey management
Extended support for 5i Expansion Modules:
- Expansion Keypad Aastra 536M is now supported by the 53i, in addition to the 55i, 57i and 57i CT.
- Expansion Keypad Aastra 560M is now supported by the 55i, in addition to the 57i and 57i CT
The new firmware update and documentation are freely available from the Aastra website. Please visit aastratelecom.com, click on Support and then select Download Area.
Contact ABP Technology for any questions on new features, technical support questions for upgraing your phones of for contact details of a local technology partner to assist you with your IP Phone network.

