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SIP Message Builder

Build a raw SIP request or response from a start line, editable headers, and optional body, with automatic Content-Length calculation.

1. Message Type

2. Headers

3. Message Body

4. Generated SIP Message

1INVITE sip:[email protected] SIP/2.0
2Via: SIP/2.0/UDP client.example.com:5060;branch=z9hG4bK776asdhds
3Max-Forwards: 70
4From: "Alice" <sip:[email protected]>;tag=1928301774
5To: <sip:[email protected]>
6Call-ID: [email protected]
7CSeq: 1 INVITE
8Contact: <sip:[email protected]:5060>
9Content-Type: application/sdp
10Content-Length: 219
11
12v=0
13o=alice 2890844526 2890844526 IN IP4 client.example.com
14s=-
15c=IN IP4 client.example.com
16t=0 0
17m=audio 49170 RTP/AVP 0 8 101
18a=rtpmap:0 PCMU/8000
19a=rtpmap:8 PCMA/8000
20a=rtpmap:101 telephone-event/8000
21a=fmtp:101 0-15
22a=sendrecv

5. Message Summary

Message TypeRequest
MethodINVITE
Request URIsip:[email protected]
SIP VersionSIP/2.0
Total Headers9
Content-Length240
TransportUDP
Has BodyYes

Quick Actions

Common Headers

Tips

  • Use a unique Call-ID for each dialog.
  • CSeq number must increment with each new request within a dialog.
  • Via branch parameter must be unique across space and time.

What is SIP Message Builder?

Build a raw SIP request or response from a start line, editable headers, and optional body, with automatic Content-Length calculation. Request or response mode, SIP method/URI/version or status line, editable headers, and optional message body such as SDP. A formatted raw SIP message that can be copied or downloaded as text.

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What the tool does

  • Input: Request or response mode, SIP method/URI/version or status line, editable headers, and optional message body such as SDP.
  • Controls and processing: Request/response selector, start-line fields, add/remove/reorder headers, body editor, and automatic Content-Length.
  • Output: A formatted raw SIP message that can be copied or downloaded as text.

How to use it

  1. Provide the input. Request or response mode, SIP method/URI/version or status line, editable headers, and optional message body such as SDP.
  2. Review the settings. Request/response selector, start-line fields, add/remove/reorder headers, body editor, and automatic Content-Length.
  3. Generate, inspect, and export. A formatted raw SIP message that can be copied or downloaded as text.

Key features

  • Input: Request or response mode, SIP method/URI/version or status line, editable headers, and optional message body such as SDP.
  • Controls and processing: Request/response selector, start-line fields, add/remove/reorder headers, body editor, and automatic Content-Length.
  • Output: A formatted raw SIP message that can be copied or downloaded as text.

Useful workflows

  • Build a raw SIP request or response from a start line, editable headers, and optional body, with automatic Content-Length calculation.
  • Use it when you need this deliverable or diagnostic result: A formatted raw SIP message that can be copied or downloaded as text.
  • Place it before the next verified workflow step: parsing and validating the message, then using it only in an authorized SIP lab.

Limits and safety notes

  • This tool builds text; it does not send SIP traffic or prove RFC compliance. Content-Length must reflect the exact encoded body bytes, and mandatory headers vary by method, dialog state, transport, and deployment.

Troubleshooting

  • Paste only the raw value or message expected by the tool; preserve quotes, delimiters, escaping, and line endings, then test a minimal valid sample.
  • If parsing succeeds but the meaning is wrong, compare the output with the target standard or runtime; successful parsing is not proof of operational validity.
  • This tool builds text; it does not send SIP traffic or prove RFC compliance. Content-Length must reflect the exact encoded body bytes, and mandatory headers vary by method, dialog state, transport, and deployment.

Frequently asked questions

What is SIP Message Builder?

Build a raw SIP request or response from a start line, editable headers, and optional body, with automatic Content-Length calculation.

How do I use SIP Message Builder?

Provide the expected input, review the page settings, then verify the result before copying or downloading it. Expected output: A formatted raw SIP message that can be copied or downloaded as text.

What input does it accept?

Request or response mode, SIP method/URI/version or status line, editable headers, and optional message body such as SDP.

What output does it produce?

A formatted raw SIP message that can be copied or downloaded as text.

What are the limits?

This tool builds text; it does not send SIP traffic or prove RFC compliance. Content-Length must reflect the exact encoded body bytes, and mandatory headers vary by method, dialog state, transport, and deployment.

Related AppKiro tools

SIP Message ParserUse it for the adjacent next task: Parse a raw SIP request or response into start line, headers, and body, with optional SDP parsing and normalized line endings.SIP Header CheckerUse it for the adjacent next task: Run rule-based checks on a SIP start line, common headers, Content-Length, and optional SDP to identify frequent formatting and consistency problems.SIP Digest Authorization TesterUse it for the adjacent next task: Calculate and compare SIP Digest authentication responses from challenge parameters, including supported MD5-family and SHA-256 options, without sending a SIP request.

Start with a verified input

Test with a small, non-sensitive sample, verify the key settings and output, then apply the result to the real workflow.

Open the tool