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The format of your number should be in +44 format, eg to call AAISP support you'd use: sip:+email@example.com
You do need to use the hostname ''aa.org.uk'' as we use SRV records to direct the call, so using an IP address
instead is not supported.
The CLI is not trusted for such calls, so are sent to your SIP handset with a ? on the front, and not passed on if the call is diverted.