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7  Control plane interworking [R6]
7.1  GeneralUp
7.2  Interworking between CS networks supporting ISUP and the IM CN subsystemPDF-p. 30
7.2.1  Services performed by network entities in the control plane
7.2.2  Signalling interactions between network entities in the control plane
7.2.3  SIP-ISUP protocol interworkingPDF-p. 32
7.2.3.1  Incoming call interworking from SIP to ISUP at I-MGCF
7.2.3.1.1  Sending of IAM
7.2.3.1.2  Coding of the IAMPDF-p. 33
7.2.3.1.2A  Coding of the IAM when Number Portability is supported [R8]
7.2.3.1.2B  Coding of the IAM for Carrier Routeing [R8]
7.2.3.1.3  Sending of COT
7.2.3.1.3A  Sending of SAM [R8]PDF-p. 53
7.2.3.1.4  Sending of 180 ringingPDF-p. 54
7.2.3.1.4A  Sending of 183 Session Progress for early media scenarios [R7]
7.2.3.1.4B  Sending of 181Call is being forwarded [R7]PDF-p. 60
7.2.3.1.4C  Sending of 183 Session Progress for overlap signalling using the in-dialog method [R8]PDF-p. 61
7.2.3.1.4D  Sending of 183 Session Progress to carry ISUP Cause [R9]
7.2.3.1.4E  Sending of 183 Session Progress for ICS call [R12]
7.2.3.1.5  Sending of the 200 OK (INVITE)PDF-p. 62
7.2.3.1.6  Sending of the Release message (REL)PDF-p. 63Up
7.2.3.1.7  Coding of the RELPDF-p. 64
7.2.3.1.8  Receipt of the Release MessagePDF-p. 65
7.2.3.1.9  Receipt of RSC, GRS or CGB (H/W oriented)PDF-p. 69
7.2.3.1.9a  Receipt of REFER [R7]
7.2.3.1.10  Autonomous Release at I-MGCFPDF-p. 70
7.2.3.1.11  Internal through connection of the bearer path

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