Response Due by time

Response Due by time

Is there a way to set the responded time manually for example we call the user instead of email them?  This really messes our SLA's up because we do not email everyone so we cannot capture the response time very reliably?
 
Basically have something that says we called the user and that would set the responsed time for us instead of having to send an email from the ticket.
 
Thanks
 
Kevin Hardy

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