Open Communications Principles and Best Practices 19/03/2012, page 7
b) advertise and receive QoS parameters,
c) advertise the power requirements to the LAN access switch by means of an
"Extended Power via MDI” TLV.
Note: LLDP-MED should only be used with LLDP enabled network access switches. Older
network access switches that don't adhere to the 802.1D-1998 MAC bridging specification
might appear to be propagating the LLDP multicasts through the subnet. In this case, LLDP-
MED should be deactivated on the phone. For further information, please refer to the
OpenStage Asterisk Admin Guide [3].
DHCP Options
The following parameters can be obtained by DHCP:
Basic Configuration
• IP Address
• Subnet Mask (option 1)
Optional Configuration
• Default route (option 3)
• Static IP routing (option 33)
• SNTP server (option 42)
• Timezone offset (option 2)
• Primary/secondary DNS server (option 6)
• DNS domain name (option 15)
• SIP Addresses / SIP Server & Registrar (SIP Server option 120)
• Vendor unique (option 43)
The vendor specific option (code 43), or alternatively, a vendor class, is used to provide the
phone with the location of an optional configuration/ provisioning service. By this means,
full Plug & Play is possible (see the following section). For further information,
including an
example configuration for dhcp, please refer to the OpenStage Asterisk Admin Guide [3].
Plug & Play – One Step Provisioning and Configuration
Provisioning via the WPI (WorkPoint Interface)
The WPI allows for controlling and provisioning the phone by a remote service using XML
messages which are transmitted over HTTPS. Unlike many other VoIP phones, which are
limited to prefabricated configuration files for download at startup time, OpenStage phones
exchange information with the provisioning service continuously. When local changes have
been executed on the phone, it will inform the provisioning service automatically.
Any kind of administration task is supported, for instance, updating the firmware on a
selection of phones, or setting SIP codes for server-based telephony features.
For further information, please refer to the WPI Developer’s Guide [8].
Plug & Play / Autoprovisioning
A fully automated mass rollout of OpenStage phones can be realized by combining a DHCP
server and the provisioning service. On startup, the phone receives the IP address of the
provisioning server from the DHCP server. After that, it contacts the provisioning service. The
provisioning service may then request all settings from the phone in order to decide which
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