Sip Clients; Sip Servers - Cisco ATA 191 Administration Manual

Analog telephone adapter
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Cisco ATA 191 Analog Telephone Adapter Overview
Typically, a SIP endpoint is capable of functioning as both a UAC and a UAS, but functions only as one or
the other per transaction. Whether the endpoint functions as a UAC or a UAS depends on the UA that initiated
the request.
From an architectural standpoint, the physical components of a SIP network can also be grouped into two
categories—Clients and servers. The following figure shows the architecture of a SIP network.
Note
SIP servers can interact with other application services, such as Lightweight Directory Access Protocol
(LDAP) servers, a database application, or an extensible markup language (XML) application. These
application services provide back-end services such as directory, authentication, and billable services.
Figure 2: SIP Architecture

SIP Clients

SIP clients include:
• Gateways—Provide call control. Gateways provide many services, the most common being a translation
function between SIP conferencing endpoints and other terminal types. This function includes translation
between transmission formats and between communications procedures. In addition, the gateway also
translates between audio and video codecs and performs call setup and clearing on both the LAN side
and the switched-circuit network side.
• Phones—Can act as either a UAS or UAC. The ATA 191 can initiate SIP requests and respond to
requests.

SIP Servers

SIP servers include:
Cisco ATA 191 Analog Telephone Adapter Administration Guide for Cisco Unified Communications Manager
Session Initiation Protocol
3

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