Answer Posted / srinivas padamata

Call from Mobile Station to land line:

1. MS after dialing a number and press send key uses RACH to
ask for a signaling channel.
2. The BSC allocates a signaling channel, using AGCH.
3. The MS sends a call setup request through SDCCH, to the
MSC/VLR. Over SDCCH, all signaling takes place. This includes:
Marking the MS status as active in the VLR (if the MS status
is not updated earlier).
The Authentication Procedure
Ciphering
Equipment Identification
Sending the called Subscriber number to the network
Checking if the subscriber has service barring of outgoing
calls activated.
4. The MSC/VLR instructs the BSC to allocate an idle TCH.
The BTS and MS are told to tune to the TCH.
5. The MSC/VLR forwards the called number to an exchange in
the PSTN, which establishes a connection to the subscriber.
6. If the called subscriber answers, the connection is
established.

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