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.
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Code |
Station Message ID Message |
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0x0000 |
Keep Alive Message |
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0x0001 |
Station Register Message |
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0x0002 |
Station IP Port Message |
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0x0003 |
Station Key Pad Button Message |
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0x0004 |
Station Enbloc Call Message |
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0x0005 |
Station Stimulus Message |
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0x0006 |
Station Off Hook Message |
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0x0007 |
Station On Hook Message |
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0x0008 |
Station Hook Flash Message |
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0x0009 |
Station Forward Status Request Message |
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0x11 |
Station Media Port List Message |
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0x000A |
Station Speed Dial Status Request Message |
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0x000B |
Station Line Status Request Message |
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0x000C |
Station Configuration Status Request Message |
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0x000D |
Station Time Date Request Message |
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0x000E |
Station Button Template Request Message |
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0x000F |
Station Version Request Message |
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0x0010 |
Station Capabilities Response Message |
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0x0012 |
Station Server Request Message |
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0x0020 |
Station Alarm Message |
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0x0021 |
Station Multicast Media Reception Ack Message |
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0x0024 |
Station Off Hook With Calling Party Number Message |
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0x22 |
Station Open Receive Channel Ack Message |
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0x23 |
Station Connection Statistics Response Message |
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0x25 |
Station Soft Key Template Request Message |
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0x26 |
Station Soft Key Set Request Message |
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0x27 |
Station Soft Key Event Message |
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0x28 |
Station Unregister Message |
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0x0081 |
Station Keep Alive Message |
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0x0082 |
Station Start Tone Message |
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0x0083 |
Station Stop Tone Message |
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0x0085 |
Station Set Ringer Message |
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0x0086 |
Station Set Lamp Message |
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0x0087 |
Station Set Hook Flash Detect Message |
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0x0088 |
Station Set Speaker Mode Message |
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0x0089 |
Station Set Microphone Mode Message |
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0x008A |
Station Start Media Transmission |
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0x008B |
Station Stop Media Transmission |
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0x008F |
Station Call Information Message |
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0x009D |
Station Register Reject Message |
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0x009F |
Station Reset Message |
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0x0090 |
Station Forward Status Message |
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0x0091 |
Station Speed Dial Status Message |
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0x0092 |
Station Line Status Message |
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0x0093 |
Station Configuration Status Message |
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0x0094 |
Station Define Time & Date Message |
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0x0095 |
Station Start Session Transmission Message |
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0x0096 |
Station Stop Session Transmission Message |
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0x0097 |
Station Button Template Message |
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0x0098 |
Station Version Message |
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0x0099 |
Station Display Text Message |
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0x009A |
Station Clear Display Message |
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0x009B |
Station Capabilities Request Message |
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0x009C |
Station Enunciator Command Message |
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0x009E |
Station Server Respond Message |
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0x0101 |
Station Start Multicast Media Reception Message |
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0x0102 |
Station Start Multicast Media Transmission Message |
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0x0103 |
Station Stop Multicast Media Reception Message |
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0x0104 |
Station Stop Multicast Media Transmission Message |
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0x105 |
Station Open Receive Channel Message |
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0x0106 |
Station Close Receive Channel Message |
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0x107 |
Station Connection Statistics Request Message |
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0x0108 |
Station Soft Key Template Respond Message |
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0x109 |
Station Soft Key Set Respond Message |
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0x0110 |
Station Select Soft Keys Message |
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0x0111 |
Station Call State Message |
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0x0112 |
Station Display Prompt Message |
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0x0113 |
Station Clear Prompt Message |
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0x0114 |
Station Display Notify Message |
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0x0115 |
Station Clear Notify Message |
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0x0116 |
Station Activate Call Plane Message |
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0x0117 |
Station Deactivate Call Plane Message |
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0x118 |
Station Unregister Ack Message |
