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GSM (Voice Call - 4) - 20

Voice Call continued [Under GSM >> Signaling]

Step 4: Assume now that the number to which call is being made is also a mobile subscriber (same network or different). MSC2 would be GMSC if call is made to another network (PSTN, CDMA etc.)

MSC1 HLR VLR2
MAP - Send Routing Info
MAP - Provide Roaming Number
MAP - PRN response
MAP - SRI response


MSC1 MSC2
ISUP - IAM


MS1 BTS1 BSC1 MSC1 VLR1
DTAP (Call Progress)
RLM (Call Progress)
FACCH, CC - Call Progress/Proceed


MS2 BTS2 BSC2 MSC2 VLR2
MAP - Incoming Call
MAP - Page
BSSMAP - Paging
DCM - Paging Command
PGCH, RR - Paging1

1: Paging Message is sent on common Paging Channel (PCH) on all BTSs (cells) in a Location Area in which mobile was registered.

We will continue "Voice Call" in next article.

References: GSM Networks book by Heine, GSM book by Mouly and Pautet, Signaling diagrams from 24.007/24.008 (R99).

© Copyright Samir Amberkar 2010

Voice Call - 3 « GSM Index » Voice Call - 5