Mitel 6867i Administrator's Manual page 163

Configuring RCS Bypass via Option 43 on a Linux DHCP Server
The following example illustrates how to configure RCS bypass via Option 43 on a Linux DHCP
server.
option space AastraIPPhone;
option AastraIPPhone.cfg-server-name code 02 = text;
option AastraIPPhone.contact-rcs code 03 = boolean;
Subnet 192.168.1.0 netmask 255.255.255.0 {
#The 6867i phones do not contact the RCS but use the defined FTP
server for configuration #files.
class "vendor-class-67i" {
match if option vendor-class-identifier="AastraIPPhone6867i";
vendor-option-space AastraIPPhone;
option AastraIPPhone.cfg-server-name
"ftp://username:password@10.10.10.1";
option AastraIPPhone.contact-rcs false;
}
#The 6869i phones do not contact the RCS.
class "vendor-class-69i" {
match if option vendor-class-identifier="AastraIPPhone6869i";
vendor-option-space AastraIPPhone;
option AastraIPPhone.contact-rcs false;
USING OPTION 120 ON THE IP PHONE
DHCP Option 120 (as referenced in RFC 3361) allows SIP clients to locate a local SIP server
(i.e. outbound proxy server) that can be used for all outbound SIP requests. Using the "use
dhcp option 120" configuration parameter, administrators can enable support for DHCP Option
120 on the IP phones. This is particularly useful when service providers require the IP phones
to use certain outbound proxy servers or Session Border Controllers (SBCs) based on
geographical location and have provisioned the outbound proxy by using DHCP Option 120.
The parameter is disabled by default.
Considerations
The following considerations must be taken into account when enabling support for DHCP
Option 120 on the IP phones:
• If the parameter is enabled and DHCP Option 120 contains a valid value, the IP phones
will use the server IP/name obtained via DHCP Option 120 as the outbound proxy for both
the Global SIP and Line 1 profiles.
• If Line 2 is configured and the outbound proxy is not defined, the phone will use the outbound
proxy located in the Global SIP profile.
• If Line 2 is configured with a valid outbound proxy, the phone will retain the configured Line
2 outbound proxy and ignore the Global SIP profile. This allows for Line 2 to be registered
to another service with another outbound proxy if required.
Network Settings
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