Hi All,
We have Cisco ISR4351-V/k9 router with SRST licenses at my remote office with 200 Cisco7821 IP Phones. Cisco ISR4351 will have 2 PRI line terminate on it.
We have Call manager in Head office location. Both the locations are connected via MPLS.
We want to configure scenario like - all the 200 cisco7821 IP Phones will get registered on Call-manager. In case of WAN connectivity failure, they will get registered on SRST router.
Can anyone guide how to configure ISR4351 router for such scenario?
Do i need to configure SIP trunk between ISR4351 & Call manager?
I have attached Connectivity diagram for reference.
Thanks.
Regards/Kartik Shah
