AsteriskNOW is a GUI on top of Asterisk; it does not change the ability of the system to handle call load.
I thought the AsteriskNOW GUI was now a FreePBX clone. If so, every call now uses a perl script to make the call. This is considerably more overhead than a dial-plan written in native asterisk code.
For the 20,000 calls, I would use Opensips for the SIP and Asterisk for audio playback, transcoding, voicemail, fun.
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