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RED with IP Telephony

Hello

I have two VLAN Data & Voice on the Head office

Data VLAN is 192.168.0.0\21

Voice VLAN is 192.168.2.0\24

IP Phones are getting the IP from call manager in the range 192.168.2.0

i enabled the RED device in one Branch with Standard unified
(there is nothing only one switch without any configuration)
after that i deleted the RED interface and enabled the bridge for the RED interafce with internal interface. then the IP phones are working fine. the ip phones getting the ip from the call manager since there is bridge between RED interface and Internal interface.

but with this scenario every thing is going via head office.

i used the other type of RED which is Transparent Split

and i made static route to the head office on the branch router and plugged the RED into the Router via WAN interface only.

from the PC i can browse internet via branch router ... i can reach head office network.

from the phone it is not working even i put the IP manually

please advice

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