can we use 2 interfaces for CME for cisco 2921?

[kenny hon]

Dear All,

I am new on cisco product.

Currently, we have conflict voip subnet mask for our vpn site. In order to solve this problem, we have added 1 for interface in cisco 2921 for CME. It got the problem now is we can call each other but no voice. I want to ask if is it only the sip trunk setting issue? or is it cisco 2921 don't support 2 interface for CME?

Looking forward your answer.

Kenny

[paolo bevilacqua]

Without changing the subnet, we would like to add another interface in our hk site such as 200.200.0.1 for the vpn link between thailand and hk site. We got the problems right now is when we dial a call, the source always is from 192.168.20.10 to 192.168.20.100, but there have no ack from 192.168.20.100. is the 2nd interface work between CME and CM using sip trunk?
Thanks
kenny

No, will not work. You need to renumber one network to eliminate the duplicate subnet.

[kenny hon]

Dear All,

That mean there have 2 solutions for the conflict subnet.

Option1 is to change other site subnet. This should be work without any problem.

Option2 is to use NAT technology in firewall? Could you explain the detail how to to NAT for this. Since all site is in production, there will have a downtime and we need to change all iphone setting. There have 2 many iphone need to change. Please help

Thanks

Kenny

[paolo bevilacqua]

Disregard the NAT 'option'. It's complicated, and not effective.

There is nothing to change in phones if they use DHCP. If they don't use DHCP, have them use it.