How to Setup DHCP Option 156 for Phones
DHCP Option 156 was not configured correctly. Please refer to the following steps below:
To set up DHCP option 156 for IP110/210/212k/530/560/560g (MGCP) telephones:
Open DHCP Manager on your Microsoft DHCP server.
Right-click the DHCP server, and select Set pre-defined options
Set Name to IP Phone Boot Server.
Set Data Type to String.
Set Code to 156 and add a description, if desired.
Navigate to the scope options and add option 156.
Set the value of option 156 to: ftpservers=ip_address, country=n, language=n, layer2tagging=N, vlanid=X
NOTE: The minimum amount of data that is required for MGCP phones in OPTION 156 is: ftpservers=IP address of the server)
It is possible to configure two FTP servers for option 156. Each parameter is enclosed in quotes, for example ftpservers="192.168.0.13, 192.168.0.23"
To set up DHCP option 156 for 400 series IP phones
- option 156 is preferred, however option 66 can be used for IP400 series phones
- Set configservers=ip_address, address DNS name etc
- Set vlan details (unless LLDP-MED is used to assign vlan ID and vlan tagging)
DHCP option 156 can include all the above parameters including configservers and ftpservers if a mix of MGCP and 400 series phones are installed
400 series phones will contact the server and download files using HTTP, not FTP
Purpose: enable/disable 802.1Q, default is disabled
where N=0 is disable, N=1 is enable
Purpose: VLAN id when 802.1Q is enabled, default is zero
where X is a VLAN id between 0 and 4094
E.g., the following would enable VLAN tagging using a VLAN id of 10:
For more information please refer to the Mitel Installation Guide
The IP Phones Display shows No Service. Looking at the phone configuration, it is set for DHCP, however the phone is missing IP parameters.
Phones are intermittently rebooted and when they reset they go into a No Service condition.
Created Date 2014-07-01 - Modified Date 2017-04-13