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VoIP CME to CME via GRE tunnel

We have a HQ office and Branch office. Each have thier CME. Calls between the offices are VoIP across the Internet using a GRE tunnel.

When employees from the HQ office visit the branch office and use IP Communicator, they are able to successfully register to thier CME across the GRE tunnel. However, when a Remote office worker visits HQ they are unable to successfully register thier IP Communicators to the Branch office CME across the GRE tunnel.

Any ideas why this is so?

Here is the debug from the Branch office CME when an IP Communicator located at the Main office network is trying to register:

See Attachment

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Re: VoIP CME to CME via GRE tunnel

Hi, I haven't looked at the debug, but generally these issues are caused by the phone not getting the "right" tftp file from the "right" CME, or general connectivity problems, eg, not every subnet is reachable from any other.