User guide
SME VoIP System Guide, Version 1.9
Proprietary and Confidential
Chapter: Functionality Overview
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9 Functionality Overview
So far we have setup our SME VoIP system. Next, in this chapter we list what features and functionalities
are available in the system. The SME VOIP system supports all traditional and advanced features of most
telephony networks. In addition, 3
rd
party components handle features like voice mail, call diversion,
conference calls, etc. A brief description of SME VOIP network functionalities are:
Outgoing/incoming voice call management: The SME VOIP system can provide multiple priority user
classes. Further, up to 3 repeaters can be linked to a Base-station.
Internal handover: User locations are reported to SIP Server in order to provide differentiated services
and tariff management. Within a DECT traffic area, established calls can seamlessly be handover
between Base-stations using connection handover procedures.
Security: The RTX SME VOIP system also supports robust security functionalities for Base-stations.
Most security
2
functionality is intrinsically woven into the SME VOIP network structure so that network
connections can be encrypted and terminal authentication can be performed.
9.1 System Feature List
This section gives a summary of some essential functionality within the wireless IP network.
Components
System Features
Speech Coding
10 channels ADPCM G.726 on air interface
3
10 channels of G729a on IP interface
4, 2
10 channels of G711 on IP interface
2
Support of mixed types of Codecs in one Base Station
In-band Tones
Dial tone
Busy tone
Ring back tone
Call waiting tone
Re-order tone
Radio Access
Mechanism
Bearer Handover and Connection Handover:
Busy indication and support
Connection re-establishment
Emergency Calls
5
: Inside or outside roaming areas
SIP support
REGISTER, INVITE, and TERMINATE sessions
Session Description Protocol (SDP), HTTP authentication
Support 200 DECT instances (depending on SME VOIP configuration)
locating SIP servers
2
With active security 4 channels is supported
3
In a multicell configuration 8 channels is supported
4
G729a requires an additional hardware module. In a multicell configuration 8 channels is supported
5
Emergency call is not possible if the Network connection is not working or in case of power failure.
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