Let me explain terms CPE and Media gateway based on your topology
CPE (Customer Premises Equipment) : This is a router which will be placed in customer site by ISP to terminate MPLS connection or lease lines.
Media gateway: It is device which is used to convert digital voice signal from ISDN PRI line to IP packet . see Wikipedia for correct explanation.
Solution for Voice,
In your pic, PRI line is terminating on media gateway. So you should register this media gateway with call manager using either MGCP or H.323 protocol. I would prefer MGCP because of less overhead to configure.
Configuration required in Media gateway.( Assuming media gateway is a cisco router and you have cisco call manager)
You can connect CPE with media gateway using Ethernet cable.
Basic IP configuration which should be reachable from your call manager.
ISDN PRI configuration in E1 port.
MGCP Backhaul configuration.
Register this router in Call Manager as a MGCP gateway.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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