I need to sizing a voice gateway for an IP telefony provider. He has an Ip PBX asterisk in G729 codec and want to comunicatte with PSTN with 4 E1 in G711 codec. The gateway would have to make trascoding of 120 channels.
I think in an Cisco2800 solution but I found the DSP problem with this solution.
I need aid to make the gateway sizing since never I had one of this size.
Thank you very much