Ensure the SIP phone is compatible with your existing VoIP provider and any other systems you may use, such as PBX systems.
Look for features that suit your needs, such as call waiting, caller ID, voicemail, call forwarding, and conferencing capabilities.
Consider the phone’s audio quality, which is influenced by the codec used and the hardware design
Check if the phone supports Power over Ethernet (PoE) for easier installation. This allows the phone to receive power and data through the same Ethernet cable.
The phone's interface should be intuitive and user-friendly. A well-organized menu and easy access to features can enhance your experience.