Signalling procedures for CAMEL

[mansoor2]

<table><tbody><tr><td><blockquote><i>Mobile Originating Calls:</i>
<center><img src="http://www.3g4g.co.uk/Tutorial/ZG/Camel/OrigCall.jpg"></center>
If an active originating CAMEL Subscription
Information (CSI) is found in the VLR during the call set up of a MS,
the Visited Service Switching Function (VSSF)
sends an InitialDetectionPoint message to the gsmSCF and the VMSC
suspends the call processing. The InitialDetectionPoint shall always
contain the service key, called and calling party number, calling
party’s category, location number, bearer capability, event type Basic
Call State Model (BCSM), location information and the International
Mobile Station Identity (IMSI). After the service logic processing
CAMEL specific handling is initiated from the gsmSCF, see figure above.
<i>Mobile Terminating Calls:</i>
<center><img src="http://www.3g4g.co.uk/Tutorial/ZG/Camel/TermCall.jpg"></center>
In the case of mobile terminating call, the Gateway
MSC (GMSC) in the interrogating PLMN identifies the HLR of the called
party with the help of the MSISDN.
Then the GMSC sends a RoutingInformation-Request to the HLR. The HLR
checks the CSI of the
called party and sends the information stored in the subscriber record
back to the GMSC. Now, the GMSC acts according to CSI. If the
terminating CSI is active the trigger criteria of a Detection Point
(DP) is fulfilled and the call processing is suspended. An InitialDP
message, which shall always contain the service key, called party
number, event type BCSM and the IMSI is sent to the CSE and the service
logic execution is started. Thereafter CAMEL specific handling is
initiated, see figure above.
</blockquote>

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