Yes it will create a loop. Not a fun time trying to track these things down. 
I've had some non-Cisco IP phones completely down a LAN.

Matthew G. Loraditch - CCNP-Voice, CCNA-R&S, CCDA
Network Engineer
Direct Voice: 443.541.1518

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From: cisco-voip [mailto:[email protected]] On Behalf Of Ahmed 
Elnagar
Sent: Thursday, November 10, 2016 8:28 AM
To: '[email protected]' <[email protected]>
Subject: [cisco-voip] IP Phone Ports

Dear all;

I want to know what will happen if a user connect "by mistake" both the PC port 
and Switch port to the network switch? Will this create a loop? Anyone tried it 
before?


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