#Lync Test mobile users’ ability to exchange instant messages in Lync Server 2013

$credential1 = Get-Credential “litwareinc\kenmyer”
$credential2 = Get-Credential “litwareinc\pilar”

Test-CsMcxP2PIM -TargetFqdn “atl-cs-001.litwareinc.com” -Authentication Negotiate -SenderSipAddres “sip:[email protected]” -SenderCredential $credential1 -ReceiverSipAddress “sip:[email protected]” -ReceiverCredential $credential2

https://technet.microsoft.com/en-us/library/dn767950(v=ocs.15).aspx

Lync Server Mobility Troubleshooting Tips