You can test VoIP network, SIP software or hardware.
It helps you make electronic circuit diagrams and export them as images.
Now you can purchase High speed calling card from Airtelplatinum.
Creates call flows & UML sequence diagrams from textual inputs.
Offer Calls is a service which allows you to place calls from your computer.
DOCOMO Calls is a windows based PC to phone dialer.
Nevron Software LLC
Nevron Diagram Designer is a freeware diagram editor.
TekSIP is a SIP Registrar and SIP Proxy for Windows.
Robust SIP ActiveX Phone is a powerful and robust SIP ActiveX phone client.
TMS Diagram Studio can add diagram and flowchart capabilities to your app.
Diagram Ring is an open source advanced diagram editor.
E-Soft Billing (Pvt.) Ltd.
SIP Mobile Dialer is designed for small and mid size VoIP/SIP providers.
Recharge Card Printing NG
Print recharge vouchers of all networks (MTN, Airtel, Etisalat, Glo, etc.).
EASY-SOFT is a graphic editor for representation of the circuit diagram.
This software enables voice, video and IM sessions based on XMPP, SIP and IAX2.