I have the following situation.
I have a site with two HP switches with a voice vlan and data vlan there are IP helper statements on the voice vlan pointing to the PBX . The PC's get there DHCP info from a branch server while the phones get there's from the PBX. Not sure when it started but noticed under leases on the branch server there was 3-4 phones getting an IP address from the sever vs the PBX. Two of these phones reside off one switch and two off the other and on both switches the port they live off of are tagged properly to the voice vlan and untagged in the data vlan. I cannot explain how these phones are getting to the branch server for their IP info. I don't hardcode phones so I know that's not it.
The following our my DHCP options on the PBX
ID=3 Name=Router value=10.x.x.x
ID=6 name =DNS Sever vlaue=10.x.x.x,10.x.x.x. note the first value for the DNS server is our branch server
ID=15 name=domain name
ID=44 Name=NetBIOS name server
ID=125 Name =MITEL value= id:ipphone.mitel.com;sw_tftp=10.x.x.x;call_srv=10.x.x.x;dscp=46
ID=128 name TFTP server
ID=129 name Call Server
ID=130 name IP phone identifier
ID=134 name DSCP value=46
Is there any documentation out there explaining how DHCP works within the phones? Ex. when a phone first boots up does it send some kind of identifier withing the packet identifying itself as a phone?
Thanks,