Vowifi Standards; Ascom Vowifi System Overview - ASCOM VoWiFi System System Description

System Description
Ascom VoWiFi System
SIP itself is not sufficient to set up a call and other IETF protocols such as RSVP, RTP, RTSP,
SAP and SDP are required to support a VoIP call. However, the functionality and operation of
SIP does not depend on any of these protocols.
3.2

VoWiFi Standards

The most basic VoWiFi system supports the following WLAN standards:
• IEEE 802.11b or IEEE 802.11b/g for Wireless LAN
• WMM™ for voice quality (QoS)
• One of or a selection of WPA™ and WPA2™ for security
• H.323 or SIP with or without supplementary services (H.450/RFC's) for telephony
4

Ascom VoWiFi System Overview

To enable an enterprise VoWiFi system where voice traffic as well as messaging and alarm
handling are possible, both Ascom and third-party developed hardware and software are
used. A basic system comprises the following products:
• VoWiFi Handset
• Access Point (AP)
• Portable Device Manager (PDM)
• Controller (optional)
• Integrated Wireless Messaging and Services (IMS3), or Unite Connectivity Manager
(Unite CM) (optional)
• VoIP Gateway/Gatekeeper (optional)
• SIP Proxy Server (in the IP-PBX) (optional)
• RADIUS Server (optional)
In a small VoWiFi system with few VoWiFi Handsets the IMS3/Unite CM is optional. The
system can be managed with the PDM only, but without an IMS3/Unite CM no messaging or
alarm handling is possible and it will be a voice system only.
IP-PBX
Figure 7. A small basic system (IMS3/Unite CM is optional)
7 September 2011 / Ver. G
PDM
IMS3/
Unite CM
VoIP Gateway
PBX
5. Figure
RADIUS
Server
Controller
IP Backbone / LAN
AP
AP
VoWiFi Handset
TD 92313EN
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