Command-Line SIP Client and Testing Tool

Sipcmd is a versatile command-line interface (CLI) tool designed for initiating SIP (Session Initiation Protocol) calls and sending SIP messages. It serves as an essential utility for developers, network administrators, and testers who need to interact with SIP-based communication systems directly from their terminal. This tool simplifies the process of testing SIP server functionalities, debugging call flows, and automating communication tasks.

Key Features and Usage Examples

Sipcmd offers a range of functionalities to manage SIP interactions. Below are common examples demonstrating its capabilities:

Initiating SIP Calls

To make a SIP call to a specific number, you can use the following command structure. This example shows how to connect to a SIP server with provided credentials and initiate a call, with a call timeout and a request to play a sound upon connection.

# Making a SIP call to a specific number
sipcmd -P sip -u username -c password -w sip.server.address -a callerID -x "c123456;w5000;r"

Sending SIP Messages

Sending instant messages via SIP is straightforward. This command demonstrates how to send a text message to a specified recipient through your SIP server.

# Sending a SIP message
sipcmd -P sip -u username -c password -w sip.server.address -a callerID -x "m123456 'Hello, this is a message'"

Receiving and Responding to Calls

Sipcmd can also handle incoming calls. This example shows how to acknowledge an incoming call and respond by playing a predefined audio file.

# Receiving a SIP call and responding with a wave file
sipcmd -P sip -u username -c password -w sip.server.address -a callerID -x "ack;w response.wav"

Managing Ongoing Calls

During an active SIP call, you can control media playback. This command illustrates how to play a specific audio file during an ongoing call after a short delay.

# Playing a wave file in an ongoing SIP call
sipcmd -P sip -u username -c password -w sip.server.address -a callerID -x "c123456;w500;r;w message.wav"

Call Termination and Duration Control

For automated testing, you can specify call durations. This command initiates a call and automatically hangs up after a set period.

# Sending a SIP call and hanging up after a set duration
sipcmd -P sip -u username -c password -w sip.server.address -a callerID -x "c123456;w5000;h"

SIP Registration and Unregistration

Managing your connection to a SIP server is crucial. Sipcmd allows you to register and unregister your client easily.

# Registering to a SIP server
sipcmd -P sip -u username -c password -w sip.server.address -a callerID -r

# Unregistering from a SIP server
sipcmd -P sip -u username -c password -w sip.server.address -a callerID -u

Further Resources

For a deeper understanding of SIP and its protocols, consult the following resources:

• RFC 3261: SIP: Session Initiation Protocol
• MDN Web Docs: WebRTC API (Related to real-time communication)
• Wikipedia: Session Initiation Protocol