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We have had mixed results when testing CallerID (CLI) on the Speedtouch 780WL/784.
In some instances, the CLI is passed successfully to the connected telephone, in other cases the CallerID doesn’t work. We haven’t been able to isolate what is causing the issue. If CLI is very important to you then it may be worth keeping a seperate phone connected directly to Manx-Telecom, not via the router.

If calls are routed inbound via VoIP/SIP – CallerID works fine.