---
title: "Discussion on \"What Is SIP? Sessions, the Handshake and Call Failures\" | Hashnode"
description: "Discussion on \"What Is SIP? Sessions, the Handshake and Call Failures\". Session, dialog, transaction, the handshake, and how to read a failed call by stage"
url: "https://hashnode.com/posts/what-is-sip/6af4124def52b2d7b4b2f501"
---

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Discussion

# [What Is SIP? Sessions, the Handshake and Call Failures](https://piyuzz.hashnode.dev/what-is-sip?utm_source=hashnode&utm_medium=feed)

Session, dialog, transaction, the handshake, and how to read a failed call by stage

2d ago · 22 min read · piyuzz.hashnode.dev  
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-   [#telephony](https://hashnode.com/tag/telephony)
-   [#networking](https://hashnode.com/tag/networking)
-   [#debugging](https://hashnode.com/tag/debugging)
-   [#sip](https://hashnode.com/tag/sip)
-   [#voip](https://hashnode.com/tag/voip)

## Written by

[Piyush Sahoo](https://hashnode.com/@piyuzz)

@piyuzz · Bengaluru, India

  
[View profile](https://hashnode.com/@piyuzz)

Founding Member, Vobiz. Writing about AI voice agents on the real phone network.

I'm a Founding Member at Vobiz, telephony for AI voice agents. I write about where voice agents meet the phone network: SIP, phone numbers, latency, echo, barge-in and everything that breaks on real calls but not in browser demos. More at piyushsahoo.me

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