Telecom Tutorials by Samir Amberkar

Voice Call continued [Under GSM >> Signaling]

Step 7: MS₂ answers the call, Call connected.

MS2

BTS2

BSC2

MSC2

VLR2

FACCH, CC - Connect RLM (Connect) DTAP (Connect)

---

MSC1

MSC2

ISUP - ANM

---

MS1

BTS1

BSC1

MSC1

VLR1

DTAP (Connect) RLM (Connect) FACCH, CC - Connect FACCH, CC - Connect Ack RLM (Connect Ack) DTAP (Connect Ack)

---

MS2

BTS2

BSC2

MSC2

VLR2

DTAP (Connect Ack) RLM (Connect Ack) FACCH, CC - Connect Ack

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 - 6 «

GSM Index

» Voice Call - 8