# ExKamailio v0.1.0 - API Reference

## Modules

- [ExKamailio.CallHandler](ExKamailio.CallHandler.md): Behaviour for the module that handles each call's media.
- [ExKamailio.CallHandler.Default](ExKamailio.CallHandler.Default.md): Passthrough used when `:call_handler` config field is not set. It returns each peer's SDP
unchanged, so the peers send media straight to each other and an app that
pulls ex_kamailio in without configuring it, as a transitive
dependency, still routes calls. Set `:call_handler` config field to handle the media
yourself. Take a look at `README.md` for more information.

- [ExKamailio.Session](ExKamailio.Session.md): State of a single call, threaded through `ExKamailio.CallHandler` callbacks:
the SIP identifiers plus every SDP that crossed the wire, in both
directions. A field is nil until the call has reached the step that fills it.