Customer had unity 4.0, request for upgrade quote. Please light me Unity upgrade path.

Could please some one light me how to calculate Backplane Bandwidth/Throughput for 4506 switches, in data sheet I am not able to get it.

It is possible to have 5 E1 lines with 3845 with PVDM -128.Or please some one light me how many PVDM channel is required for one e1 channel.

i am getting the following error , in the cisco 877 ADSL router connecetd to the internet adsl line .Can any one tell me if my configuration is correct ? and why this authentication error occurs ?Thanks in advance..i am also attaching my config !!...

Hi , At one of my client place i have Cisco Call Manager 4.2 (3) and 7941 Ip Phones and 7912 Ip Phones , 7985 video IP Phones and 2800 Voice Gate way. Now the Problem is Im Not able to Dial to any External Phones even to an External Mobile no or a La...