Supported Protocols - Cisco 7960G Administrator's Manual

Chapter 1 Product Overview

Supported Protocols

The Cisco SIP IP phone supports the following protocols.
Table 1-1
Protocol
AVT
DHCP
DNS
Dynamic DNS and
TFTP
HTTP
ICMP
IP
RTP
SDP
Supported Protocols
Description
Audio video transport. Handles payload negotiation.
Dynamic Host Configuration Protocol. Dynamically allocates and assigns IP
addresses. DHCP allows you to move network devices from one subnet to
another without administrative attention. It allows connection of Cisco SIP
IP phones to the network so that they become operational without having to
manually assign an IP address and additional network parameters. DHCP
option 60 allows the Cisco SIP IP phone to identify itself with
vendor-specific information. The Cisco SIP IP phone complies with DHCP
specifications documented in RFC 2131. By default, the phone is
DHCP-enabled.
Domain Name System. Translates names of network nodes into addresses.
SIP 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 Cisco SIP IP 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 SIP
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 SIP IP phone supports IP as defined in RFC 791.
Real-Time Transport Protocol. Supports transport of real-time data (such as
voice) over data networks. RTP also has the ability to obtain
quality-of-service (QoS) information. The Cisco SIP IP 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
SIP IP phone uses SDP for session description.
Cisco SIP IP Phone Administrator Guide, Release 6.x and 7.x
Supported Protocols
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