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« on: December 20, 2017, 02:36:42 PM »
There is no simple answer to your question - again, will depends of your system config, network, SIP provider...
Eg. - you will using FXO - in order to communicate with IP (SIP) terminals, you will need Voice channels and DSP resource for transcoding. You will using SIP trunks - can you sucessfuly answer and transfer a call? If you have problem with transfer - then you need to route voice traffic thru the system - you need DSP. Can you make sucessful call and transfer between extensions on different nodes? If no - (sometime network config don't allow direct media routing between terminals) - you will need DSP...
In all my installation I have enough DSP's (or EIP) to satisfy all above - hard learned lesson on one of the first install...
But, it's your call...
BR