John and I made a call to one another today which went very well. The nature of the SIP/SIP connection has Asterisk acting only as a facilitator to get two endpoints talking directly to one another.
SIP/SIP connections mean that call quality is determined by the speed and available bandwidth of the two connecting clients, not on the ability of the Asterisk server to process data quickly. Processor speed and other hardware requirements become an issue with PSTN lines connecting to pretty much everything else, as well as connecting the Asterisk PBX to the cellular network (both scenarios in which additional hardware is required).
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