Few things to note when you use telephony products like Axon, IVM, etc...

• Each additional concurrent call is going to require more and more CPU power to handle and could cause the system to crash if it gets overloaded
• Your VoIP provider may choose to limit the number of concurrent calls you can receive
• Your Internet connection must be able to support very heavy bandwidth use (up to 180kbps per call)

A standard call using the default G.711 codec needs up to 64kbps Ethernet bandwidth downstream and upstream equally. GSM needs only 8kbps, while G.726 needs 32kbps.

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