Early media use

You can use VoIP SIP SDK to make a custom intercom.
Obviously you can make a connection to communicate before you open the door.
However, one of the basic features of this solution is to be able to see the person near door before actually making a connection.
This feature is typically called early media.

How to implement it for Android:

when received incoming call in Android app invoke method:
phone.answerCall(183, true);

This method sends to remote side SIP request “183 Session progress+SDP”,
which allows start sending audio\video in both directions, but call still not answered.
Then you can answer or reject call.
If you have more questions please contact us.

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