I hear often that it is hard to practice/demo voice related configurations with GNS3. This is only partially true.
It is correct that GNS3 cannot substitute Multiservice routers like 28xx etc because the DSP resources cannot be emulated. For using T1/E1 or FXS/FXO connections you need the real hardware interfaces and of course another PBX/router interface to connect your T1 to. If you have a double T1 you could use a T1 x-over to let the router do both ends.
For all other configurations like Dial-peers, translation patterns, SIP-UA configurations, CME, ephone registrations, CUBE etc, GNS3 can do the job. Just an example…
Cisco Systems
GNS3 (dynamips) and Voice-Labs
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Foobar2000 is an advanced audio player for the Windows platform Some of the basic features include ReplayGain support low memory footprint and native support for several popular audio formats nbsp Features of foobar2000 Audio formats supported MKA MP1 MP2 MP3 MP4 MPC AAC Ogg Vorbis FLAC Ogg FLAC WavPack WAV AIFF AU SND CDDA WMA Full unicode support Advanced tagging capabilities Support for transcoding all supported audio formats using the Converter component requires external commandline encoder executables for different output formats ReplayGain support both playback and calculation Customizable keyboard shortcuts Open component architecture allowing third party developers to extend functionality…
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DFX Audio Enhancer 9.101
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