Cisco 7941G Administration Guide - Page 27
Cisco Unified IP Phones use TCP to, the Cisco Unified IP Phone to use - voip phone
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Chapter 1 An Overview of the Cisco Unified IP Phone What Networking Protocols are Used? Table 1-1 Supported Networking Protocols on the Cisco Unified IP Phone (continued) Networking Protocol Session Description Protocol (SDP) Session Initiation Protocol (SIP) Skinny Client Control Protocol (SCCP) Transmission Control Protocol (TCP) Purpose Usage Notes SDP is the portion of the SIP protocol that determines which parameters are available during a connection between two endpoints. Conferences are established by using only the SDP capabilities that are supported by all endpoints in the conference. SDP capabilities, such as codec types, DTMF detection, and comfort noise, are normally configured on a global basis by Cisco Unified Communications Manager or Media Gateway in operation. Some SIP endpoints may allow these parameters to be configured on the endpoint itself. SIP is the Internet Engineering Task Like other VoIP protocols, SIP is Force (IETF) standard for designed to address the functions of multimedia conferencing over IP. SIP signaling and session management is an ASCII-based application-layer within a packet telephony network. control protocol (defined in Signaling allows call information to RFC 3261) that can be used to be carried across network establish, maintain, and terminate boundaries. Session management calls between two or more endpoints. provides the ability to control the attributes of an end-to-end call. You can configure the Cisco Unified IP Phone to use either SIP or Skinny Client Control Protocol (SCCP). SCCP includes a messaging set that allows communications between call control servers and endpoint clients such as IP Phones. SCCP is proprietary to Cisco Systems. Cisco Unified IP Phones use SCCP for call control. You can configure the Cisco Unified IP Phone to use either SCCP or Session Initiation Protocol (SIP). TCP is a connection-oriented transport protocol. Cisco Unified IP Phones use TCP to connect to Cisco Unified Communications Manager and to access XML services. Cisco Unified IP Phone 7961G/7961G-GE and 7941G/7941G-GE for Cisco Unified Communications Manager 6.1 OL-14620-01 1-9