Interoperability Between Machine-to-Machine Communication System and IP Multimedia Subsystem - Interoperability and Open-Source Solutions for the Internet of Things - page 113

DA GSCL I MS

UAA

P-CSCF S-CSCF MTAS/AP HSS I MS UA

(phone )

HTTP

1:UPDATE (PUT)
door bell ring
2: STATUS-OK (204)

3:NOTIFY (POST)
door bell ring
4 : STATUS-OK (204)

SIP

5: INVITE

6: INVITE

7: INVITE
8: INVITE

9: LIR (DIAMETER)
10: LIA (DIAMETER)

11: INVITE
12: INVITE

13: INVITE

14: INVITE

15: 200 OK

16: 200 OK

17: 200 OK
18: 200 OK
19: 200 OK
20: 200 OK

21: 200 OK

22: 200 OK

Multimedia Session Establishment

Fig. 8. Multimedia session establishment

2 GSCL accepts update and respond with STATUS-OK.
3 GSCL notifies IMS User Agent Application (UAA), which is subscribed
to door bell status data, that door bell is ringing.
4 UAA accepts data.
5-6 The UAA on gateway initiates a SIP-INIVITE request with SDP Offer
[ 4 , 6 ] towards S-CSCF (A) via P-CSCF keeping UE-B IP Address in
Request URI to establish the session.
7-8 Based on initial filter criteria (IFC) configured in S-CSCF (A) for the
originating services of UE-A, the S-CSCF (A) sends the INVITE request
towards the application server (MTAS) to invoke telephony services.
MTAS initiates a new INVITE request with a CALL-ID towards
S-CSCF (A).
9-10 Based on the UE-B IP in Request URI within INVITE message, S-CSCF
sends the Location Information Request towards HSS requesting the S-
CSCF details for UE-B. HSS acknowledges the request by providing the
IP address of the S-CSCF serving UE-B.
11-12 Based on IFC's configured in S-CSCF (B) for the terminating services
of UE-B, the S-CSCF (B) sends the INVITE request towards MTAS to
invoke telephony services. MTAS initiates a new INVITE request with
a CALL-ID towards S-CSCF (B).
13-14 S-CSCF sends the INVITE request towards UE-B via P-SCSF to estab-
lish the session.
15-16 UE-B acknowledges the request by sending 200 OK towards S-CSCF (B)
via P-CSCF including the SDP Answer.