Lync Client 2013 - Redial External Contacts

Envrionment  :

Lync Standard Edition with 2 Front Enda dn 1 Edge Server present

AudioCode Gateway acts as the SBC for SIP trunk to the enviornment.

User is saving an external contacts in his outlook contact settings.

Now to reach this contact, he is manually selecting the contact card and clicking more to dial the external contacts number.If the call is successfull or unsuccessful a entry is created in the call logs of Lync client.

Now second time the user is going to his call logs and selecting REDIAL. This time, Lync client is NOT seeing the external contacts phone number and instead of that it is dialing to external contacts email address.

How to change this on group wide settings such a way that redial only takes the phone number and not external email address ?

Thanks & regards

regards