8/10/2019 02. NGN Protocol Overview.pdf
http://slidepdf.com/reader/full/02-ngn-protocol-overviewpdf 1/24
ISSUEISSUE
Fixed Network Curriculum
Development Section
Fixed Network Curriculum
Development Section
OAA000003 NGN ProtocolOverview
OAA000003 NGN ProtocolOverview
2.02.0
8/10/2019 02. NGN Protocol Overview.pdf
http://slidepdf.com/reader/full/02-ngn-protocol-overviewpdf 2/24
Security Level: Internal
2
ObjectiveObjective
Concepts of SoftSwitch interfaces
and protocols
Classification of SoftSwitch protocols
Roles of SoftSwitch protocols and
signaling
After this session, you will learn:
8/10/2019 02. NGN Protocol Overview.pdf
http://slidepdf.com/reader/full/02-ngn-protocol-overviewpdf 3/24
Security Level: Internal
3
About this SessionAbout this Session
Interfaces and Protocols
SoftSwitch Signaling System
SoftSwitch Signaling Classification
SoftSwitch Signaling Bearing
8/10/2019 02. NGN Protocol Overview.pdf
http://slidepdf.com/reader/full/02-ngn-protocol-overviewpdf 4/24
Security Level: Internal
4
Interface and ProtocolInterface and Protocol
An interface is the connection point
between two adjacent network entities,
and a protocol specifies the principles
to be followed for information
interchanging over such connection
points (interfaces) Different protocols
are usually used on different interfaces
and maybe on the same interface aswell.
8/10/2019 02. NGN Protocol Overview.pdf
http://slidepdf.com/reader/full/02-ngn-protocol-overviewpdf 5/24
Security Level: Internal
5
SoftSwitch Interfaces and ProtocolsSoftSwitch Interfaces and Protocols
MRS
IADAMG
TMG
SG
SIP
SIGTRAN
H.248
MGCP
MGCP/SIP/H.323
M G C P /
H . 2 4 8
EPhone
SIP域域域域
SIP
H.323
MML/SNMP
NMS
FTP/FTAM
BC 业务层业务层业务层业务层
控制层控制层控制层控制层
接入层接入层接入层接入层其它网络其它网络其它网络其它网络
SoftSwitch SoftSwitch
SS7
H.323域域域域
PSTN
SCP
I N A P
P A R L A Y
APP Server
S I P / I N A P
M G C P / H . 2 4 8
8/10/2019 02. NGN Protocol Overview.pdf
http://slidepdf.com/reader/full/02-ngn-protocol-overviewpdf 6/24
Security Level: Internal
6
Corresponding Relations between SoftSwitch
Interfaces and Protocols
Corresponding Relations between SoftSwitch
Interfaces and Protocols
TCP/IPFTP or FTAMSoftSwitch-BC (Billing Center)
-MML or SNMPSoftSwitch-NMS (Network Management Syst)
UDP/IP、、、、TCP/IPH.323SoftSwitch-H.323
UDP/IPSIPSoftSwitch-SIP (Sesion Initiation Protocol)
MTPSS7SoftSwitch-PSTN/ISDN (Public OldTelephone Network) Integated services data
network)
UDP/IPSIPSoftSwitch-SoftSwitch
UDP/IP、、、、TCP/IPH.323UDP/IPSIP
UDP/IPMGCP
SoftSwitch-Terminal
UDP/IPMGCPSoftSwitch-MRS (Media Resource Server)
UDP/IPMGCP、、、、H.248SoftSwitch-IAD (Integrated access device)
UDP/IPMGCP、、、、H.248SoftSwitch-AMG (Access Media Gateway)
UDP/IP、、、、SCTP/IP、、、、TCP/IPH.248SoftSwitch-TMG (Trunk media Gateway)
M3UA/M2UA/SCTP/IPSIGTRANSoftSwitch-SG (Signalling Gateway)
Signaling Transmission ProtocolsApplication
Protocols
Interface
8/10/2019 02. NGN Protocol Overview.pdf
http://slidepdf.com/reader/full/02-ngn-protocol-overviewpdf 7/24
Security Level: Internal
7
SoftSwitch Protocol SystemSoftSwitch Protocol System
MTP1
IP
TCP
H.248 MGCP SIP
MAC
SS7 H.248 MGCP SIP
MTP3
MTP2
I
SUP
SCTP
IP
MAC
SCTPUDP
IP
MAC
UDP
IP
MAC
UDP
1
2
3
4
5
6
7
OSI
layerlayerlayerlayer
IP
H.323
MAC
H.323
TCPUDPM2UA
M3UA
SCCP
TCAP
INAP
8/10/2019 02. NGN Protocol Overview.pdf
http://slidepdf.com/reader/full/02-ngn-protocol-overviewpdf 8/24
Security Level: Internal
8
About this SessionAbout this Session
Interfaces and Protocols
SoftSwitch Signaling System
SoftSwitch Signaling Classification
SoftSwitch Signaling Bearing
8/10/2019 02. NGN Protocol Overview.pdf
http://slidepdf.com/reader/full/02-ngn-protocol-overviewpdf 9/24
Security Level: Internal
9
SS7 SignalingSS7 Signaling
MACMTP1
MTP2
MTP3
SCCP
TCAP
TUP
ISUP
M3UA
IP
INAP
User part
MTP
M2UA
SCTP
8/10/2019 02. NGN Protocol Overview.pdf
http://slidepdf.com/reader/full/02-ngn-protocol-overviewpdf 10/24
Security Level: Internal
10
SIP ProtocolSIP Protocol
Session Initiation Protocol (SIP) is an
application-layer control protocol that
can establish, modify and terminate
multimedia sessions or calls. It is the
core protocol of IETF multimedia data
and control architecture. It can be easily
expanded, conveniently achieved, and
suitable to implement Internet-based
multimedia conference systems.
The NGN Soft-Switch system
interconnects with other Soft-Switch
systems and SIP domain devices via SIP
signaling, achieving the call control
functions between them.
MAC
IP
UDP
SIP
User Part
MTP
8/10/2019 02. NGN Protocol Overview.pdf
http://slidepdf.com/reader/full/02-ngn-protocol-overviewpdf 11/24
Security Level: Internal
11
H.323 ProtocolH.323 Protocol
MAC
IP
H.323
UP
MTP
TCPUDP
Q.931 RAS/H.245
H.323 is a communication control protocol put
forward by ITU. It provides multimedia
communications services over Packet Based
Networks (PBNs). Call control is one of the
major parts of H.323 and can be used to
establish point-to-point media conference andmultipoint media conference.
H.323 defines entities such as H.323 Gateways,
Gatekeepers, Multipoint Controllers, Multipoint
Processors and Multipoint Control Units. H.323
Gateways are between Switched Circuit
Network (SCN) and packet switched network.Gatekeepers provide access control and
address translation services. Multipoint
Controllers (MCs) provide the multipoint control
function for the multiparty conference.
Multipoint Processors (MPs) enables mixing of
multipoint media streams.
H.323 itself is a protocol set, including such
protocols as RAS, Q.931 and H.245. RAS is
transmitted on UDP, Q.931 is transmitted on
TCP and H.245 is transmitted on UDP.
8/10/2019 02. NGN Protocol Overview.pdf
http://slidepdf.com/reader/full/02-ngn-protocol-overviewpdf 12/24
Security Level: Internal
12
MGCP and H.248MGCP and H.248
Media Gateway Control Protocol is a master/slave equipment control
protocol that provides signaling and call control for Media Gateways and
Voice over IP (VoIP) terminal devices (the Media Gateway Controller
controlling the Media Gateway). The protocol is a combination of simplegateway control protocols and IP equipment control specifications.
H.248/Megaco is a successor to MGCP and will finally replace it, while
their protocol concepts are thoroughly different. With the development of
NGN, the media control protocols between the MGC and the MG will beunified to H.248 gradually.
SoftSwitch Soft-Switch System acts as a MGC in the distributed gateway
model and controls various Media Gateways (such as Access Gateways,
Trunking Gateways, Residential Gateways, Media Resource Servers, etc.)via MGCP/H.248.
8/10/2019 02. NGN Protocol Overview.pdf
http://slidepdf.com/reader/full/02-ngn-protocol-overviewpdf 13/24
Security Level: Internal
13
MGCP and H.248MGCP and H.248
MAC
IP
UDP
MGCP
UP
MTP
SCTP/TCP
H.248
8/10/2019 02. NGN Protocol Overview.pdf
http://slidepdf.com/reader/full/02-ngn-protocol-overviewpdf 14/24
Security Level: Internal
14
About this SessionAbout this Session
Interfaces and Protocols
SoftSwitch Signaling System
SoftSwitch Signaling Classification
SoftSwitch Signaling Bearing
8/10/2019 02. NGN Protocol Overview.pdf
http://slidepdf.com/reader/full/02-ngn-protocol-overviewpdf 15/24
Security Level: Internal
15
SoftSwitch Signaling ClassificationSoftSwitch Signaling Classification
Signaling transport protocol – Signaling transport layer protocol
provides SoftSwitch with signaling transport services. One
application protocol of SoftSwitch can usually use multiple transport
protocols. For example, H.248 can use SCTP/TCP/UDP.
Bearer control protocol is a kind of master/slave protocol used for
Media Gateway Controller (MGC) to control Media Gateways (MGs),
such as Access Gateways, Trunk Gateways and Residential Gateways
from external call elements like a Call Agent (SoftSwitch).
Call control protocol – A protocol used to control call setup,
connection and termination. The call control protocols used in
SoftSwitch are ISUP of SS7, SIP and H.323. In a VoIP domain, SIP and
H.323 serve for call control in multimedia conference. ISUP is the call
control protocol used for the switched circuit network. 。。。。
8/10/2019 02. NGN Protocol Overview.pdf
http://slidepdf.com/reader/full/02-ngn-protocol-overviewpdf 16/24
Security Level: Internal
16
Signaling Transmission ProtocolsSignaling Transmission Protocols
IP, TCP, UDP.
SCTP: Stream control transport protocol
M2UA - - User adaptation layer protocol of SS7 MTP2.
M3UA - - User adaptation layer protocol of SS7 MTP3.
MTP (Message Transport Protocol) - - SS7 network
protocol of TDM.
SCCP - -Providing INAP with signaling transmission
service
8/10/2019 02. NGN Protocol Overview.pdf
http://slidepdf.com/reader/full/02-ngn-protocol-overviewpdf 17/24
Security Level: Internal
17
Bearer Control ProtocolsBearer Control Protocols
Bearer control protocol is used to control media
gateways.
MGCP and H.248 protocols
8/10/2019 02. NGN Protocol Overview.pdf
http://slidepdf.com/reader/full/02-ngn-protocol-overviewpdf 18/24
Security Level: Internal
18
Call Control ProtocolsCall Control Protocols
ISUP and INAP -- Switched circuit network control
protocols.
H.323 and SIP - -Call control protocols in packet
switched network
8/10/2019 02. NGN Protocol Overview.pdf
http://slidepdf.com/reader/full/02-ngn-protocol-overviewpdf 19/24
Security Level: Internal
19
AttentionAttention
Bearer control protocols are non-peer-to-peer protocols,
used between MGC and MG only, while call control
protocols are peer-to-peer protocols, used betweenMGC and MGC, that is, namely, inter-office signaling.
MGCP and H.248 protocols accomplish the bearer
control functions in the communication between TMG
and MGC, and the call control protocol above them is
ISUP. In communication between AG and MGC, ISUP
has the call control functions (for example, identification
of hanging on, hanging off, etc.) in addition to the bearer
control functions.
8/10/2019 02. NGN Protocol Overview.pdf
http://slidepdf.com/reader/full/02-ngn-protocol-overviewpdf 20/24
Security Level: Internal
20
About this SessionAbout this Session
Interfaces and Protocols
SoftSwitch Signaling System
SoftSwitch Signaling Classification
SoftSwitch Signaling Bearing
8/10/2019 02. NGN Protocol Overview.pdf
http://slidepdf.com/reader/full/02-ngn-protocol-overviewpdf 21/24
Security Level: Internal21
Question/issueQuestion/issue
What protocols does SoftSwitch adopt?
In what occasions are these protocols
used?
8/10/2019 02. NGN Protocol Overview.pdf
http://slidepdf.com/reader/full/02-ngn-protocol-overviewpdf 22/24
Security Level: Internal22
AnswerAnswer
-FTP or FTAMSoftSwitch-BC
-MML or SNMPSoftSwitch-NMS
UDP/IPSIPSoftSwitch-SIP entity
MTPSS7SoftSwitch-PSTN/ISDN
UDP/IPSIPSoftSwitch-SoftSwitch
UDP/IPSIPUDP/IPMGCPSoftSwitch-Ephone
UDP/IPMGCPSoftSwitch-MRS
UDP/IPMGCP、H.248SoftSwitch-IAD
UDP/IPMGCP、H.248SoftSwitch-AMG
UDP/IP、SCTP/IP、TCP/IPH.248SoftSwitch-TMG
M2UA/SCTP/IPSIGTRANSoftSwitch-SG
Signaling TransportProtocols
Application ProtocolsInterface
8/10/2019 02. NGN Protocol Overview.pdf
http://slidepdf.com/reader/full/02-ngn-protocol-overviewpdf 23/24
Security Level: Internal23
SummarySummary
SoftSwitch uses the following protocols: SIGTRAN,
MGCP, H.248, H.323, SIP and ISUP.
SIGTRAN protocol group is used when SoftSwitch is
interconnected with PSTN, over which the ISUP protocol
is borne. MGCP and H.248 protocols are used for
interconnection with various MGs. H.323 and SIPprotocols are used for interconnection among
SoftSwitch devices, and meanwhile, H.323 can also be
used for interworking with H.323 media terminal, while
SIP can be used for interworking with SIP terminal.