Basic Communication Procedures
Nur für den internen Gebrauch
A31003-S2000-R102-16-7620 02/2016
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Provisioning Service, Developer’s Guide
c03.fm
Basic Message Flow
3.1.2.2
Provisioning Service Located Behind A Firewall
When the provisioning service is located behind a firewall, or in a DMZ, it may have no possi-
bility to send a contact-me message to the phone. To enable provisioning service driven inter-
actions despite this limitation, the phone can be configured so that it periodically polls the pro-
visioning service, or a special proxy, for new messages. The procedure is as follows:
1. On startup, the phone receives the address and port of the provisioning service from the
DHCP server.
2. During the startup procedure, the phone contacts the provisioning service (see Section
3.5.1, "An Exemplary Startup Interaction").
3. The provisioning service instructs the phone to poll the provisioning service, or a proxy,
along with the target URL for the polling messages, and the polling interval (see Section
6.1, "Provisioning Service Related").
4. From now on, the phone will periodically poll the provisioning service, or proxy, according
to the configured polling interval.
In the following message flow, the phone polls the provisioning service or proxy, and the provi-
sioning service resp. proxy has no new message for the phone:
Phone
Provisioning
Service /
proxy
HTTP Request
Polling the provisioning
service or proxy
HTTP Response
Status=200 OK
