Cisco IP 7960G Product Overview - Page 10

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Supported Protocols

The Cisco MGCP IP phone supports the following protocols.

Table 1-2

Protocol

DHCP

DNS

Dynamic DNS and

TFTP

HTTP

ICMP

RTP

SDP

SNTP

Cisco MGCP IP Phone Administrator Guide, Release 6.x and 7.x

1-10

Supported Protocols

Description

Dynamic Host Configuration Protocol. Client or manually configured using

a local setup menu. DHCP is used to allocate and assign IP addresses. DHCP

allows you to move network devices from one subnet to another without

administrative attention. It allows connection of Cisco MGCP IP phones to

the network so that they become operational without having to manually

assign an IP address and additional network parameters.

The Cisco MGCP IP phone supports DHCP as defined in RFC 2131. By

default, the phone is DHCP-enabled.

Domain Name System. Used in the Internet for translating names of network

nodes into addresses. MGCP uses DNS to resolve the host names of

endpoints into IP addresses.

You can configure additional DNS and TFTP servers. Upon bootup, the

phone first goes to the default TFTP server to download the configuration

files. If a new dynamic TFTP server is specified in the files, the phone

requests a new set of files from the specified server. If new DNS addresses

are specified in the files, the phone uses those addresses for lookups.

Hypertext Transfer Protocol. The phone contains limited support for

HTTP 1.1. The phone uses HTTP to retrieve Cisco CallManager XML files.

Internet Control Message Protocol. 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 defined in RFC 792.

Internet Protocol. 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 defined in RFC 791.

Real-Time Transport Protocol. Supports transport of real-time data (such as

voice data) over data networks. RTP also has the ability to obtain

quality-of-service (QoS) information. The phone supports RTP as a media

channel.

Session Description Protocol. An ASCII-based protocol that describes

multimedia sessions and their related scheduling information. Third-party

call control is supported using delayed media negotiation, which is SDP data

that is not completely advertised in the initial call setup. SDP also supports

endpoints specified as fully qualified domain names (FQDNs). The Cisco

MGCP IP phone uses SDP for session description.

Simple Network Time Protocol. Synchronizes computer clocks on an IP

network. Current date and time are supported using SNTP including time

zone and daylight saving time. The Cisco MGCP IP phone uses SNTP for

date and time support.

Chapter 1

Product Overview