Specifications

Platforms
4
Cisco IOS Release 12.0(3)T
FIFO—First-in, first-out. In data communication, FIFO refers to a buffering scheme where the first
byte of data entering the buffer is the first byte retrieved by the CPU. In telephony, FIFO refers to a
queueing scheme where the first calls received are the first calls processed.
ISDN—Integrated Services Digital Network. ISDN is a communications protocol, offered by
telephone companies, that permits telephone networks to carry data, voice, and other traffic.
Multilink PPP—Multilink Point-to-Point Protocol. This protocol is a method of splitting,
recombining, and sequencing datagrams across multiple logical data links.
PBX—Private Branch Exchange. Privately owned central switching office.
PLAR—Private Line Auto Ringdown. PLAR is a leased voice circuit that connects two telephones.
When either telephone handset is lifted, the other telephone automatically rings.
POTS—Plain old telephone service. Basic telephone service supplying standard single-line
telephones, telephone lines, and access to the Public Switched Telephone Network.
POTS dial peer—Dial peer connected via a traditional telephony network. POTS peers point to a
particular voice port on a voice network device.
PRI—Primary Rate Interface. PRI is an ISDN interface to primary rate access. Primary rate access
consists of a single 64-kbps D channel plus 23 T1 or 30 E1 B channels for voice or data.
PSTN—Public Switched Telephone Network. PSTN refers to the local telephone company.
PVC—Permanent virtual circuit.
QoS—Quality of service, which refers to the measure of service quality provided to the user.
RSVP—Resource Reservation Protocol. This protocol supports the reservation of resources across
an IP network.
T1—Digital WAN carrier facility. T1 transmits DS1 formatted data at 1.544 Mbps through the
telephone-switching network, using AMI or B8ZS coding. T1 is the North American equivalent of
an E1 line.
Trunk—Service that allows quasi-transparent connections between two PBXs, a PBX and a local
extension, or some ther combination of telephony interfaces to be permanently conferenced together
by the esession application and signalling passed transparently through the IP network.
U-law—A companding technique commonly used in North America. U-law is standardized as a
64-kbps CODEC in ITU-T G.711.
VoIP dial peer—Dial peer connected via a packet network; in the case of Voice over IP, this is an
IP network. VoIP peers point to specific VoIP devices.
Platforms
The Voice over IP feature is supported on the following Cisco device platforms:
• Cisco AS5300 access servers
• Cisco 3600 series routers
The configuration procedure described in this document pertains to the Cisco AS5300. For
information on how to configure Voice over IP on Cisco 3600 series routers, refer to the Cisco IOS
Release 12.0 Voice, Video, and Home Applications Configuration Guide.