I`m designing a CME with 2851 ISR Router. It has 96 IP Phones and a E1 interface to the PSTN (30 voice channels). I have a issue calculating a DSP resources. I will like to know a cisco document who talks about the DSP calculator. I`ve used the DSP Calculator tool but the issue is that it ask me about the number of transcoding and coferences... I`m not sure how many I should put there.
My scenario is: CCME 2851 with 96 IP Phones and a E1 interface to the PSTN on the central site and remote site CCME 2811 with 36 IP phones and a E1 interface to the PSTN. I will like to have cominications between these CCME, conference and conference to the PSTN. I`m going use a H323 with codec G729 to doesn`t oversubscribe the link.
Thanks in advance