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Chapter 3. Telephony Protocols > Skinny Client Control Protocol

Skinny Client Control Protocol

SCCP is a Cisco proprietary master/slave protocol that CUCM and other call agents can use to communicate with devices and endpoints, such as Cisco IP phones. One advantage of SCCP is that it is flexible and allows features to be easily added.

SCCP uses TCP ports 2000 (SCCP) and 2443 (Secure SCCP [SCCPS]). Skinny gateway (analog) uses TCP port 2001 and skinny gateway (digital) uses TCP port 2002.

Figure 3-1 illustrates an SCCP call between two phones registered to the same CUCM.

Figure 3-1. SCCP Call Flow

Image

In Figure 3-1, phone#1 goes off-hook and signals this event to the CUCM.

CUCM sends messages to phone#1 that trigger a dial tone and causes phone#1 to set its lamp state to on.

The user of phone#1 begins to dial a number, and the first digit is dialed (and sent to the CUCM), which causes the CUCM to indicate to phone#1 that the dial tone should no longer be played.


  

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