14.2.5.7. Subscriber Parameters 
Starting with V10R1 OpenScape 4000 supports Subscriber Parameters for UFIP clients
based on SIP OPTIONS messages.
If a station does not respond in a certain amount of time to these messages, the
station is de-registered.
WBM Implementation
Subscriber Parameters are displayed in the WBM of the HG board, at
Configuration - Voice Gateway - SIP Options.
Figure 240. Subscriber Parameters
SIP OPTIONS ping interval:
- The timer is started by setting a value not equal to 0, but in the range of 30 - 3600 seconds.
- The value represents the time interval after which an OPTIONS message will be sent to a station.
SIP OPTIONS retry attempts:
- It represents the number of sent messages for which no answer (200 OK) is received, before the station is de-registered.
- The value should be in the range of 1 - 5.