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Daniel D'ArcyFlag for United Kingdom of Great Britain and Northern Ireland

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Avaya VoIP ethernet pass-through Cisco switch

I am trying to setup our client side pc's to use the pass-through Ethernet port on our Avaya 1608-i phones. I am having an issue that I can only connect one device to the port on the Cisco switch at a time. If I plug the phone in to the switch it works and if I plug the PC in to the switch that will work fine. If I use the pass-though port on the phone then only either the phone or the pc will pick up an IP.

We are not using a separate Vlan for VoIP.

is there a setting on the switch that I am missing?
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masnrock
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It was the 'Switchport Port-Security' setting. It was set to allow only one MAC address at a time.
Exactly.