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Virtual Modem - Use virtual modems instead of hardware to connect legacy software over the Internet.
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MAPS™ SIP Protocol Emulator (Generate and Receive SIP signaling with traffic)
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MAPS™ SIP Protocol Emulator (Generate and Receive SIP signaling with traffic)
SerEmu Serial Port Emulator download | SourceForge.net
SIP Protocol Emulator for Low- and High-Density Applications - Newsletter
How to Disable SIP ALG on Popular Routers
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