What is Early Media in SIP and how is it used in an intercom?

What is Early Media in SIP and how is it used in an intercom?

Early Media is a term that refers to audio or video that is transmitted before a call is fully established. It means that media can be heard or seen before the call is officially answered. 

In an intercom scenario, Early Media can be used to play ringtones or announcements, or even transmit audio or video before the call is accepted by the receiver. These improve the user experience by providing feedback before the call is answered. 

As a SIP-based service, Robin intercoms support standard SIP call flows, including Early Media. The specific configuration depends on the SIP server or VoIP provider in your project, as these settings are typically controlled by the telephony platform rather than the intercom itself. 

Alert
Not all endpoints support Early Media. This will depends on the devices being used as endpoints, which may be SIP phones, indoor displays, desktop clients, or mobile apps.

All three components (the intercom, the SIP platform, and the receiving device) must support Early Media for it to work.

If the endpoint does not support Early Media, the user will usually receive just a standard ringing signal and won't see video or hear audio until after the call is answered. 

    • Related Articles

    • What is the difference between SIP and Secure SIP?

      SIP is used to set up and manage calls between an intercom device and a phone system. Standard SIP communication is not encrypted. Secure SIP (TLS) adds a layer of encryption to protect the signalling between the intercom and the SIP server. It ...

    • Can the intercom be used with a 4G mobile connection?

      Robin intercoms do not have built-in 4G connectivity. However, they can be used in combination with an external 4G router. In this type of setup, the intercom is connected with an Ethernet cable to the 4G router. This allows the router to provide ...

    • Does the Robin Intercom support Secure SIP?

      Yes. All Robin intercoms support SIP over UDP, TCP, and Secure SIP via TLS 1.2. This allows secure communication between the intercom and modern IP-PBX and VoIP platforms. Secure SIP ensures that call setup data, such as credentials and session ...

    • What SIP settings are required for CyberGate?

      CyberGate acts as a bridge between Microsoft Teams and the Robin intercom. Before integrating, you must register your intercom device on the CyberGate platform. Once registered, CyberGate will automatically generate a SIP username and password. These ...

    • What indicates a successful SIP connection?

      The Control menu in the Robin web portal shows both the SIP registration status and any active call information in real time. When the SIP connection is successful, you will see the registration status in the intercom web portal labelled Registered. ...