Dialing And Messaging Features; Supported Protocols - Cisco MGCP IP Phone Administrator's Manual

Chapter 1 Product Overview

Dialing and Messaging Features

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Supported Protocols

The Cisco MGCP IP phone supports the following standard protocols:
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Message Waiting Indication—Lights to indicate that a new voice message is in a subscriber's
mailbox. If the subscriber listens to the message but does not save or delete the message, the light
remains on. If a subscriber listens to the new message or messages, and saves or deletes them, the
light goes off. The message waiting indicator (MWI) is controlled by the voicemail server. The
indication will be saved over a phone upgrade or reboot.
Notified entity: A CA can direct an endpoint to send notify messages to an alternate destination.
Call waiting, call transfer, call forward (unconditional, busy, no answer), announcement, music on
hold, and volume control. (Must be supported by the CA.)
Three-way calling using an external multipoint control unit (MCU). (Must be supported by the CA.)
Domain Name System (DNS)—Used in the Internet for translating names of network nodes into
addresses. The MGCP IP Phone uses DNS to resolve the host names of endpoints to IP addresses.
Dynamic Host Control Protocol (DHCP)—Used to dynamically allocate and assign IP addresses.
DHCP allows you to move network devices from one subnet to another without administrative
attention. If using DHCP, you can connect Cisco MGCP IP phones to the network and become
operational without having to manually assign an IP address and additional network parameters.
The Cisco MGCP IP phone complies with the DHCP specifications documented in RFC 2131. By
default, Cisco MGCP IP phones are DHCP-enabled.
Internet Control Message Protocol (ICMP)—A network layer Internet protocol that enables hosts to
send error or control messages to other hosts. ICMP also provides other information relevant to IP
packet processing.
The Cisco MGCP IP phone supports ICMP as it is documented in RFC 792.
Internet Protocol (IP)—A network layer protocol that sends datagram packets between nodes on the
Internet. IP also provides features for addressing, type-of-service (ToS) specification, fragmentation
and reassembly, and security.
The Cisco MGCP IP phone supports IP as it is defined in RFC 791.
Real-Time Transport Protocol (RTP)—Transports real-time data (such as voice data) over data
networks. RTP also has the ability to obtain Quality of Service (QoS) information.
The Cisco MGCP IP phone supports RTP as a media channel.
Session Description Protocol (SDP)—An ASCII-based protocol that describes multimedia sessions
and their related scheduling information.
The Cisco MGCP IP phone uses SDP for session description.
Simple Network Time Protocol (SNTP)—Synchronizes computer clocks on an IP network. The
Cisco MGCP IP phones use SNTP for their date and time support.
Transmission Control Protocol (TCP)—Provides a reliable byte-stream transfer service between two
endpoints on an Internet. The Cisco IP Phone 7960 supports TCP for Telnet and HTTP sessions.
Trivial File Transfer Protocol (TFTP)—Allows files to be transferred from one computer to another
over a network. The Cisco MGCP IP phone uses TFTP to download configuration files and software
updates.
Cisco MGCP IP Phone Administrator Guide, Release 5.0 and Release 5.1
Supported Features
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