I think you mean 6248P and not 6548p.  There are no 65xx PowerConnect switch models.  This issue was addressed in firmware updates.  Here is a link to the latest firmware 3.3.3.3 download for the 6248P switch. www.dell.com/.../DriverFileFormats Also we need to check your configuration for anything with the proxy-arp command on it via cli with the show run command.  If you see proxy-arp and you have not configured it then it will need to be removed manually. Please keep us updated,
Seeing duplicate SIP INVITES with Dell 6548P switches. The first SIP INVITE shows up with the phone's Source address.The second SIP INVITE shows up with the Dell Switch's Source address. It's not a retransmitted SIP Invite. It is a duplicate. The only difference is the SOURCE. Any ideas what would cause this ?   First SIP Invite: [IMAGE]  Second SIP Invite: [IMAGE]  
Dell 6548P - duplicate VOIP SIP invites