Invalid Line URL detected for the user %1 (enabled for Pc-to-Pc Voice). Line URL for Pc-to-Pc voice enabled users must be ...

Lync Server 2013

Invalid Line URL detected for the user %1 (enabled for Pc-to-Pc Voice). Line URL for Pc-to-Pc voice enabled users must be specified as a tel: uri. Otherwise functionality that depends on the Line URL for such users will be affected. Data will not be replicated until this problem is fixed. 
The source of the replication is %2.

Resolution:
Fix invalid Line URL.

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