Extended and Miscellaneous Headers

This section covers a range of SIP headers that provide additional functionalities beyond the core and IMS-specific capabilities. These headers address various aspects of SIP communications, from enhancing user experience with customized alerting signals to supporting network functionality and service logic.

Alert-Info
This header specifies custom ring tones or alert signals for incoming calls, allowing for a personalized call experience.
Format Example: Alert-Info: <http://example.com/sounds/ring2.wav>;purpose=info