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Prepend Caller ID number

Posted by mike82 on Fri, 02/04/2011

How can I prepend a 1 to the caller ID. It is coming as 10 digits. So when use go through the call lists pressing the Dial key results in a failed call since it lacks 1 to properly make the outgoing call. All my routes are _1NXNXXXXXXX and I use a SIP gateway so I don't want to reconfigure it force the 1 on 10 digit calls.