NEC UNIVERGE SL2100 Manual page 6

UNIVERGE SL2100 Release 1.8 Overview
3.1.4 Technical Information
Please refer to the SL2100 Features Manual for full details on iOS Push Notification Service operation.
The following details the new items.
Definition of Terms
Operation when there is an incoming call to the ST500 VoIP Application
1. When the SL2100 receives a call request to the ST500 VoIP Application, it sends the PUSH
Notification Request (HTTPs) to the PUSH Proxy before calling the ST500 VoIP Application.
2. The PUSH Proxy sends a PUSH Notification Request to the specified PUSH Notification Service
after the PUSH Proxy receives a PUSH Notification Request from the SL2100. After that, the PUSH
Notification Service sends the PUSH Notification to the ST500 VoIP Application directly.
3. When the VoIP Application receives the PUSH Notification, it refreshes its registration to the
SL2100.
4. At the same time as when the SL2100 receives the registration update, it starts calling the VoIP
Application to terminate the incoming call. With this feature, the SL2100 sends a PUSH
Notification request for terminating an incoming call or sending a MWI (message waiting
indication: RFC3842) notification to the ST500 VoIP Application.
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