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SME VoIP System Guide, Version 1.5
Proprietary and Confidential
Chapter: Functionality Overview
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14 Functionality Overview
So far we have setup our SME VoIP system. Next, in this chapter we describe 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, about 3 repeaters can be linked to a Base-station depending on customer
requirements and assuming that the DECT RPN values are geographically unique.
Internal/external 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. External handover are
supported for terminals within roaming regions.
Mobility: The network supports seamless mobility where handset subscription information controls
allowed mobility. A user terminal can be assigned 2 mobility options:
- Mobility within in single DECT traffic area.
- Mobility within a group of DECT traffic areas. Registration procedure can be activated in one or
multiple cells.
Security: The RTX SME VOIP system also supports robust security functionalities for Base-stations.
Most security
1
functionality is intrinsically woven into the SME VOIP network structure so that network
connections can be encrypted and terminal authentication can be performed.
14.1 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
2
10 channels of G729a/b on IP interface
3, 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
Error tone
Call waiting tone
Messages waiting tone
Ring Back tone
1
With active security 4 channels is supported
2
In a multicell configuration 8 channels is supported
3
G729a requires an additional hardware module.