Cisco SCCP: Skinny Client Control Protocol
Skinny Client Control Protocol (SCCP) is a Cisco proprietary protocol used between Cisco Call Manager and Cisco VOIP phones. It is also supported by some other vendors.
For VOIP solutions, the end station of a LAN or IP- based PBX must be simple to use, familiar and relatively cheap. SCCP defines a simple and easy to use architecture, while the H.323 recommendations are quite an expensive system. An H.323 proxy can be used to communicate with the Skinny Client using the SCCP. In such a case the telephone is a skinny client over IP, in the context of H.323. A proxy is used for the H.225 and H.245 signalling.
With the SCCP architecture, the vast majority of the H.323 processing power resides in an H.323 proxy known as the Cisco Call Manager. The end stations (telephones) run what is called the Skinny Client, which consumes less processing overhead. The Client communicates with the Call Manager using connection-oriented (TCP/IP-based) communication to establish a call with another H.323-compliant end station. Once the Call Manager has established the call, the two H.323 end stations use connectionless (UDP/IP-based) communication for audio transmissions. Costs and overhead are thus reduced by confining the complexities of H.323 call setup to the Call Manager, and using the Skinny protocol for the actual audio communication into and out of the end stations.
Protocol Structure - SCCP (Skinny): Skinny Client Control ProtocolThe skinny client (i.e. an Ethernet Phone) uses TCP/IP to transmit and receive calls and RTP/UDP/IP to/from a Skinny Client or H.323 terminal for audio. Skinny messages are carried above TCP and use port 2000. The message types are as follows:
Station Message ID Message 0x0000
Keep Alive Message 0x0001
Station Register Message 0x0002
Station IP Port Message 0x0003
Station Key Pad Button Message 0x0004
Station Enbloc Call Message 0x0005
Station Stimulus Message 0x0006
Station Off Hook Message 0x0007
Station On Hook Message 0x0008
Station Hook Flash Message 0x0009
Station Forward Status Request Message 0x11
Station Media Port List Message 0x000A
Station Speed Dial Status Request Message 0x000B
Station Line Status Request Message 0x000C
Station Configuration Status Request Message 0x000D
Station Time Date Request Message 0x000E
Station Button Template Request Message 0x000F
Station Version Request Message 0x0010
Station Capabilities Response Message 0x0012
Station Server Request Message 0x0020
Station Alarm Message 0x0021
Station Multicast Media Reception Ack Message 0x0024
Station Off Hook With Calling Party Number Message 0x22
Station Open Receive Channel Ack Message 0x23
Station Connection Statistics Response Message 0x25
Station Soft Key Template Request Message 0x26
Station Soft Key Set Request Message 0x27
Station Soft Key Event Message 0x28
Station Unregister Message 0x0081
Station Keep Alive Message 0x0082
Station Start Tone Message 0x0083
Station Stop Tone Message 0x0085
Station Set Ringer Message 0x0086
Station Set Lamp Message 0x0087
Station Set Hook Flash Detect Message 0x0088
Station Set Speaker Mode Message 0x0089
Station Set Microphone Mode Message 0x008A
Station Start Media Transmission 0x008B
Station Stop Media Transmission 0x008F
Station Call Information Message 0x009D
Station Register Reject Message 0x009F
Station Reset Message 0x0090
Station Forward Status Message 0x0091
Station Speed Dial Status Message 0x0092
Station Line Status Message 0x0093
Station Configuration Status Message 0x0094
Station Define Time & Date Message 0x0095
Station Start Session Transmission Message 0x0096
Station Stop Session Transmission Message 0x0097
Station Button Template Message 0x0098
Station Version Message 0x0099
Station Display Text Message 0x009A
Station Clear Display Message 0x009B
Station Capabilities Request Message 0x009C
Station Enunciator Command Message 0x009E
Station Server Respond Message 0x0101
Station Start Multicast Media Reception Message 0x0102
Station Start Multicast Media Transmission Message 0x0103
Station Stop Multicast Media Reception Message 0x0104
Station Stop Multicast Media Transmission Message 0x105
Station Open Receive Channel Message 0x0106
Station Close Receive Channel Message 0x107
Station Connection Statistics Request Message 0x0108
Station Soft Key Template Respond Message 0x109
Station Soft Key Set Respond Message 0x0110
Station Select Soft Keys Message 0x0111
Station Call State Message 0x0112
Station Display Prompt Message 0x0113
Station Clear Prompt Message 0x0114
Station Display Notify Message 0x0115
Station Clear Notify Message 0x0116
Station Activate Call Plane Message 0x0117
Station Deactivate Call Plane Message 0x118
Station Unregister Ack Message
Nguồn http://www.javvin.com/protocolSCCP.html
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Skinny Client Control Protocol (SCCP) is a Cisco proprietary protocol used between Cisco Call Manager and Cisco VOIP phones. It is also supported by some other vendors.
For VOIP solutions, the end station of a LAN or IP- based PBX must be simple to use, familiar and relatively cheap. SCCP defines a simple and easy to use architecture, while the H.323 recommendations are quite an expensive system. An H.323 proxy can be used to communicate with the Skinny Client using the SCCP. In such a case the telephone is a skinny client over IP, in the context of H.323. A proxy is used for the H.225 and H.245 signalling.
With the SCCP architecture, the vast majority of the H.323 processing power resides in an H.323 proxy known as the Cisco Call Manager. The end stations (telephones) run what is called the Skinny Client, which consumes less processing overhead. The Client communicates with the Call Manager using connection-oriented (TCP/IP-based) communication to establish a call with another H.323-compliant end station. Once the Call Manager has established the call, the two H.323 end stations use connectionless (UDP/IP-based) communication for audio transmissions. Costs and overhead are thus reduced by confining the complexities of H.323 call setup to the Call Manager, and using the Skinny protocol for the actual audio communication into and out of the end stations.
Protocol Structure - SCCP (Skinny): Skinny Client Control ProtocolThe skinny client (i.e. an Ethernet Phone) uses TCP/IP to transmit and receive calls and RTP/UDP/IP to/from a Skinny Client or H.323 terminal for audio. Skinny messages are carried above TCP and use port 2000. The message types are as follows:
Station Message ID Message 0x0000
Keep Alive Message 0x0001
Station Register Message 0x0002
Station IP Port Message 0x0003
Station Key Pad Button Message 0x0004
Station Enbloc Call Message 0x0005
Station Stimulus Message 0x0006
Station Off Hook Message 0x0007
Station On Hook Message 0x0008
Station Hook Flash Message 0x0009
Station Forward Status Request Message 0x11
Station Media Port List Message 0x000A
Station Speed Dial Status Request Message 0x000B
Station Line Status Request Message 0x000C
Station Configuration Status Request Message 0x000D
Station Time Date Request Message 0x000E
Station Button Template Request Message 0x000F
Station Version Request Message 0x0010
Station Capabilities Response Message 0x0012
Station Server Request Message 0x0020
Station Alarm Message 0x0021
Station Multicast Media Reception Ack Message 0x0024
Station Off Hook With Calling Party Number Message 0x22
Station Open Receive Channel Ack Message 0x23
Station Connection Statistics Response Message 0x25
Station Soft Key Template Request Message 0x26
Station Soft Key Set Request Message 0x27
Station Soft Key Event Message 0x28
Station Unregister Message 0x0081
Station Keep Alive Message 0x0082
Station Start Tone Message 0x0083
Station Stop Tone Message 0x0085
Station Set Ringer Message 0x0086
Station Set Lamp Message 0x0087
Station Set Hook Flash Detect Message 0x0088
Station Set Speaker Mode Message 0x0089
Station Set Microphone Mode Message 0x008A
Station Start Media Transmission 0x008B
Station Stop Media Transmission 0x008F
Station Call Information Message 0x009D
Station Register Reject Message 0x009F
Station Reset Message 0x0090
Station Forward Status Message 0x0091
Station Speed Dial Status Message 0x0092
Station Line Status Message 0x0093
Station Configuration Status Message 0x0094
Station Define Time & Date Message 0x0095
Station Start Session Transmission Message 0x0096
Station Stop Session Transmission Message 0x0097
Station Button Template Message 0x0098
Station Version Message 0x0099
Station Display Text Message 0x009A
Station Clear Display Message 0x009B
Station Capabilities Request Message 0x009C
Station Enunciator Command Message 0x009E
Station Server Respond Message 0x0101
Station Start Multicast Media Reception Message 0x0102
Station Start Multicast Media Transmission Message 0x0103
Station Stop Multicast Media Reception Message 0x0104
Station Stop Multicast Media Transmission Message 0x105
Station Open Receive Channel Message 0x0106
Station Close Receive Channel Message 0x107
Station Connection Statistics Request Message 0x0108
Station Soft Key Template Respond Message 0x109
Station Soft Key Set Respond Message 0x0110
Station Select Soft Keys Message 0x0111
Station Call State Message 0x0112
Station Display Prompt Message 0x0113
Station Clear Prompt Message 0x0114
Station Display Notify Message 0x0115
Station Clear Notify Message 0x0116
Station Activate Call Plane Message 0x0117
Station Deactivate Call Plane Message 0x118
Station Unregister Ack Message
Nguồn http://www.javvin.com/protocolSCCP.html
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