| Extensions of the CorNet-IP protocol with the EFC (EFC: Extended Fast Connect) protocol variant make the "IP/IP e2e payload via enterprise proxy" feature available for connections of IP terminals/clients to the ITSP. The "IP/IP e2e payload via enterprise proxy" makes it unnecessary for the DSP of the HG 1500 (DSP: digital signal processor) to process the IP packets. Thus, gateway channels for the HG 1500 are no longer used and the maximum number of calls only depends on the codec in use and the available bandwidth of the DSL connection.
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