Showing results for 
Search instead for 
Did you mean: 

HOW to design UC solution across the internet.


Dear Sir or Madam,

         I have UC project that have 1,076 branches that have the internet connectivity. I design to install Call Manager at HQ site.

I would like IP Phone from 1,076 branches register to Call Manager at HQ, I plan to use IME to complete this solution.

I have some question:

1. Do I have to have IME Server at HQ and all branches.

2. Do I have to have ASA appliance at all branches.

If they have to have IME and ASA at all branches, I thinks it over budget so do you have any others recommend solution ?

Would you be so kind to suggest me the acomplish this project.

Best Regards,

Supattra S.

2 Replies 2


What is your design going to look like?  where is all the phone lines?  everything at HQ or phone lines at each site?

Are you going to use SRST/CME for backup purposes?

What VGW's are you using at each site?

How stable is your internet connections?  at each branch?  and at HQ?

I personally have not used IME, but I think it would have a lot to do with the design.  Can everything run from branch to HQ to IME, or are the branches all over the world, and for bandwidth purposes need to be closer to the branches?

Budget dollar wise, maybe depending on size of the branch you could use a 5505 vs a 5510 vs 5525 or to save some cash maybe you would be able to use a higher end IOS feature set to get all your VPN and IOS ZBFW?  if your talking about 1 or 2 phones at a branch maybe you could use the VPN feature in the phone?

I think you have left a lot of unknowns for anyone to really answer these questions in full.




do you want to use IME on every branch? i dont think a centralised deployment with IME is possible. Unless IME works with CUCME, you would require CUCM, IME and ASA at EACH branch.

I would rather go with a site to site VPN tunnell over internet (DMVPN?) if the internet connections are reliable.

Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: