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ASCOM TD 92326GB Manual de usuario Pagina 6

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TD 92407GB
2007-12-10/ Ver. D
Function description
Ascom IP-DECT System
4
3 DECT Handset
3.1 Voice Functions
The IP-DECT system uses Voice over Internet Protocol (VoIP) as the technology for
transmission of voice. The voice packets are divided and compressed by the IPBS/IPBL
before they are sent over the network.
The transmission of voice packets between the IPBS/IPBL and the VoIP Gateway/
Gatekeeper/SIP proxy is handled by the LAN.
The gatekeeper manages the so called H.323 zone which is a logical collection of all the
H.323 endpoints within the IP-DECT system. The SIP Proxy manages the so called SIP zone
which is a logical collection of all the SIP endpoints withing the IP-DECT system.
They both provide address translation (routing) between internal and external numbering
plans and also provides admission control, specifying which device can call which number.
Figure 2.
IMS
IP Backbone / LAN
002
DECT handset
IPBS
IPBS
IP-PBX
master
IPBS
Voice
Signal
Figure 2. Voice/signal transmission
External Call to/from the DECT Handset
1 The DECT handset associates with the closest base station (the base station with
the best signal quality and strength).
2 The base station establishes a signalling connection to the master.
3 A call setup request is sent to the IP-PBX.
4 The IP-PBX finds the receiving part and sets up the call.
5 The voice packets are sent directly between the base station and the IP-PBX.
3.1.1 Roaming and Handover
The IP-DECT system supports roaming between all base stations in the system. It also
supports handover if there is overlapping speech coverage between base stations.
Roaming and handover is supported by all Ascom DECT Handsets.
3.2 Messaging Functions
A message to a cordless handset can be generated either from the message tool in the
IMS, contact inputs directly on the IMS, or SMS between the handsets. The message can
be initiated by, for example closing (or opening) a contact.
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