SIP Call Session Between 2 Phones


A SIP call session between two phones is established as follows:

  1. The calling phone sends out an INVITE.
  2. The called phone sends an information response 100 – Trying – back.
  3. When the called phone starts ringing a response 180 – Ringing – is sent back.
  4. When the caller picks up the phone, the called phone sends a response 200 – OK.
  5. The calling phone responds with ACK – acknowledgement.
  6. Now the actual conversation is transmitted as data via RTP.
  7. When the person calling hangs up, a BYE request is sent to the calling phone.
  8. The calling phone responds with a 200 – OK.

It’s as simple as that! The SIP protocol is logical and very easy to understand.

Related Blogs

An Overview Of Microsoft Teams Calling Security

In today's ever-evolving digital environment, the significance of secure communication cannot be overstated, particularly for businesses. The protected exchange of confidential data is paramount, and thanks to its robust security protocols, Microsoft Teams emerges as a standout solution.   In this article, we will explore the vital security features that Microsoft Teams...

30/01/2024 | Read more

The Ultimate Guide To Microsoft Teams Calling

In the ever-evolving landscape of business communication, digital technology has revolutionised how we connect, collaborate, and carry out our daily operations. Among the various innovations, Microsoft Teams phone calling has emerged as a beacon of transformation, offering a seamless and integrated communication experience. This article explores the heart of Microsoft Teams phone...

12/12/2023 | Read more

Proven Communication Strategies for Remote Teams

As a result of the pandemic, more and more businesses have embraced remote working, bringing about a major change in our work culture. This trend is altering how teams interact and collaborate, highlighting the importance of effective communication as a key factor for success.   Common Challenges Of Remote Communication Communication can...

02/11/2023 | Read more