What is the most likely cause when a VoIP phone receives an IP address in the wrong subnet?

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Multiple Choice

What is the most likely cause when a VoIP phone receives an IP address in the wrong subnet?

IP addresses for VoIP phones come from DHCP, and which subnet a phone gets is tied to the VLAN its switch port is in. If the phone is on the correct port but the VLAN is misconfigured or the phone is connected to the wrong VLAN, it will reach a DHCP scope that serves a different subnet. The resulting lease will be from that other subnet, so the phone ends up with an IP address in the wrong subnet. While a misconfigured DHCP server could also cause odd subnets to appear, the most common and direct cause in this scenario is the phone being on the wrong VLAN. An exhausted IP pool would usually prevent obtaining an address, and a non-PoE port doesn’t affect DHCP/IP addressing.

IP addresses for VoIP phones come from DHCP, and which subnet a phone gets is tied to the VLAN its switch port is in. If the phone is on the correct port but the VLAN is misconfigured or the phone is connected to the wrong VLAN, it will reach a DHCP scope that serves a different subnet. The resulting lease will be from that other subnet, so the phone ends up with an IP address in the wrong subnet. While a misconfigured DHCP server could also cause odd subnets to appear, the most common and direct cause in this scenario is the phone being on the wrong VLAN. An exhausted IP pool would usually prevent obtaining an address, and a non-PoE port doesn’t affect DHCP/IP addressing.

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