Introduction

this page explains the Basic about how Ringback and Early media is working. Who will play the Ringing tone.

There are different options:

1. SIP phone is generating the ringtone locally (Platform sends 180 Ringing without SDP)
2. SIP phone plays the ringtone coming from the platform (Platform sends 180 Ringing with SDP)

SIP phone generates the ringtone locally.

SIP phone plays the ringtone coming from the platform.

SIP phone receives Local Ringback, followed by Remote Ringback.

It can be that you dial a user that provides local ringback and this user is forwarded when no answer to another user that provides remote ringback.