- Purple, 4500 points or more
What are the components needed for a pure Cisco VoIP system? How do POTS lines get connected to the router? How does the router support multiple DIDs or is this a function of the Call Manager? Are there any good links that lays this out from the ground up?
Hope all is well
Just to add on a link to the good tips from Liam (+5 Liam!)
One of the best "starting" points for deploying IPT is
the SRND. This will describe alot of the Design, Deployment
Gateway, Endpoint etc. etc. etc. questions;
Cisco Unified Communications SRND Based on Cisco Unified Communications Manager 7.x
Please support CSC Helps Haiti
Call processing is done by the Communications Managers (CUCM)
Typically you will have a publisher and a number of subscribers (each a seperate server). The pub contains your database and is the point of admin while the subs do all the call processing work. each sub can handle up to 7500 phones. You can have 4 active subs for 30000 phones, and 4 standby subs. You can also have seperate servers for TFTP and other servies.
Endpoints can be Cisco phones, Analog phones attached to voice Gateways (VG224), SIP end points etc. or "soft phones" that run on laptops or even iPhones.
Connection to the pstn can be by SIP Trunk, T1/E1, or simple FXO. interfacing to the pstn is done through a switch or router with interface cards. you can have a 2811 router with T1 interfaces or FXO interfaces or a 6500 series Catalyst switch with 6 T1 ports per module.
HTH, let me know if I can give anymore info.