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8.5

Cisco Call Manager Express remote working / branch office example

Asked by itsystemsgroup in Telecommunications, Voice Over IP, Network Routers

Tags: Cisco, CME, Call Manager, VOIP, Remote, CIPC, Cisco Communicator, DHCP, IVS, Voice

Hi Guys,

OK, I'm very new to Cisco and Voip. I have setup a 2811 router with Call Manager Express and have 2 x Cisco 7906G telephones and 1 x Cisco IP Communicator working nicely. That bit was simple. So all phones can call each other. I am trying to evaluate a Cisco solution vs, say 3cx.

So here come the questions:

1) Since the Phone images are tranferred each time via TFTP, how does this work for a remote worker? He/she will be in a hotel room with a DHCP address from the hotel, will they have to connect to the office via a VPN then somehow connect to the TFTP server and get the image? How does that work if they need DHCP Option 150 for the phone image, ie my TFTP server is 10.0.0.1 and their laptop has a 'real' ip address.

2) If I want to setup a mini branch office, does the router at the branch have to run a VOIP image or can it connect to the VOIP router in the main office and somehow pass on the TFTP image for the phone in the remote office?

I'd like to setup something really simple, just extend my two phones from being locally connected to being in another subnet to test how this might work, ie. Branch office phone connected to a switch and old 2600 router (not running VOIP image) , that router connected to my 2811 Voip/CME/DHCP router via a DB60 serial crossover-cable (to simulate a VPN/ subnet??) then connect up a Main Office phone and try to make calls.

Does anybody know how to do this or point me to a nice reference guide - I have had a good look around and can't find any config examples or explanation how I might get a TFTP image from one site to another with DHCP and option 150.

All I want to do is call the main office from a remote one.

Any help would be much appreciated.

Mike

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Cisco Call Manager Express remote working / branch office example

Asked by itsystemsgroup in Telecommunications, Voice Over IP, Network Routers

Tags: Cisco, CME, Call Manager, VOIP, Remote, CIPC, Cisco Communicator, DHCP, IVS, Voice

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