Mitel 6800 Series Administrator's Manual page 164

Mitel 6800 Series SIP Phone Release 4.2.0 SP2 Administrator Guide
• If Line 2 is configured for another service but no outbound proxy is wanted/required, ad-
ministrators should not leave the outbound proxy as undefined (i.e. 0.0.0.0) as the phone
will use the outbound proxy located in the Global SIP profile. Instead, administrators should
specify the proxy/registrar's address as the outbound proxy.
• If the parameter is enabled, but the server does not have an outbound proxy configured,
DHCP Option 120 is ignored and the phone will behave as if the parameter is disabled.
• As Option 120 does not support port numbers directly, if a non-standard port (i.e. other than
5060) is required, this must be set using the configuration parameter "sip outbound proxy
port" or by the use of DNS SRV in which case "sip outbound proxy port" must be set to 0.
Enabling/Disabling DHCP Option 120 Using the Configuration Files
Use the following procedure to enable/disable DHCP Option 120 using the configuration files.
CONFIGURATION FILES
For specific parameters you can set in the configuration files, see Appendix A, the section,
"DHCP Option Settings"
USING OPTION 132 (802.1P VLAN ID) AND OPTION 43 TO TRANSFER
VLAN ID ASSIGNMENT USING DHCP
There are now two ways of transporting the VLAN ID parameter in the Dynamic Host
Configuration Protocol (DHCP):
• By DHCP Option 43 (vendor specific information)
• By DHCP Option 132 (802.1P VLAN ID)
When the phone receives the VLAN ID from the DHCP and the value is different from the one
used by the phone to trigger the DHCP request, the phone reboots and then sends a new
DHCP request in the new VLAN. The phone will remember the VLAN ID obtained by DHCP
options so that on a reboot, the phone will send a DHCP request using the correct VLAN.
If using DHCP Option 43 to transfer VLAN ID assignment the following sub-options are utilized.
Additionally, the corresponding rules must be followed:
SUB-OPTION/
CODE
08
4-11
on .
page A-13
DESCRIPTION
ID string to enable the use of the
VLAN identity in sub-option/code 09.
Must be specified to avoid conflict
with other vendors.
RULE
Must be the 16-byte character string
"Aastra{space}Telecom{space}{space}"
(i.e. Aastra Telecom followed by two space
characters).
16-byte hex equivalent:
4161737472612054656c65636f6d2020