When connecting MP card, IP-PAD cards or IP telephones to Ethernet switches that support STP, Spanning Tree Protocol (IEEE 802.1d)and LACP, Link Aggregation Control Protocol (IEEE 802.3ad), there is a strong possibility that communications will be disrupted. Ensure that both of these features are deactivated on Ethernet switches.

The following are examples of conflict with these features:

• IP telephones fail to connect to the PBX.

• Calls between IP telephones cannot be made.

• Calls between IP telephones and legacy telephones or trunk cannot be made.

• With Remote PIM over IP the Remote site does not operate in Normal mode.