Descriptions
According to the GSM official terminology (GSM Recommendations 02.03 and 02.30), an emergency call is a mobile originating call to a nearby emergency call center (e.g. the police). Emergency calling is a teleservice derived from telephony, but it provides a simple and unified procedure to set up an emergency call. The emergency call will be connected at no charge.
GSM prescribes a standard emergency number (i.e. dialing 112) which is accepted throughout the world. In addition, the mobile equipment manufacturer can provide an SOS key which initiates this internationally accepted emergency number when pressed. The PLMN operator can install some abbreviated (emergency) numbers for certain country-dependent or area-dependent emergency service centers. Calls are then routed to a nearby service point, based on the cell-oriented routing feature.
Implementation
1.Go to EMS >Configuration >NSS >VLR.
2.Click the
1.On the System tab, configure the necessary parameters given in the following table.
2.Click the
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button to update parameters to application servers.
For example: Subscriber dials 112, MSC transforms 112 to 623157 and routes it to emergency center.
1.Refer to previous section to Enable Local Call.
2.Go to EMS >Configuration >NSS >MSC.
3.Click the
1.Click on the proper hyperlinked number to open the Location Area configuration window.
2.Choose an idle item from the 0 to 7 Emergency Number list and record its index number.
3.Add the Emergency Number which will be routed to emergency center.
4.Click the
1.Click on the proper hyperlinked number to open the Dialing Prefix Set configuration window.
2.Click the hyperlinked number in the Dialing Prefix Entries to open the Dialing Prefix table.
3.Click New at the bottom of the Prefix table to create Emergency Number (112) prefix.
4.Configure the necessary parameters given in the following table.
5.Click the
6.Repeat step 3 to 5 to add the transformed Emergency Number (623157) prefix.
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For example: Subscriber dials 112, MSC transforms 112 to 623157 and routes it to emergency center.
1.Refer to previous section to Enable Local Call.
2.Go to EMS >Configuration >NSS >MSC.
3.Click the
1.Click on the proper hyperlinked number to open the Location Area configuration window.
2.Click the hyperlinked number in the Cell Entries to open the Cell table.
3.Click on the proper hyperlinked number to open the Cell configuration window.
4.Choose an idle item from the 0 to 7 Emergency Number list and record its index number.
5.Configure the Emergency Number which will be routed to emergency center.
6.Click the
1.Click on the proper hyperlinked number to open the Dialing Prefix Set configuration window.
2.Click the hyperlinked number in the Dialing Prefix Entries to open the Dialing Prefix table.
3.Click New at the bottom of the Prefix table to create Emergency Number (112) prefix.
4.Configure the necessary parameters given in the following table.
5.Click the
6.Repeat step 3 to 5 to add the transformed Emergency Number (623157) prefix.
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