Specifications

Functions
Interconnect Call Processing
August 08, 2000 68P81095E55-E 5-3
VSELP -- PCM
Conversion
The VSLEP compression at the MS is converted to standardized PCM for use on
other networks by the BSC/XCDR The BSC is also the bridge between the Mobis
protocol link and the PCM SS7 link.
Other Network
Routing
Once the radio link is established, the transmitted connect request (NADP, MSISDN
or GSM phone number) is processed by the MSC databases for other provider
network routing. The MSC uses SS7 routing, messaging and trunking to cross
connect the voice data packets to the appropriate other provider network.
Dual-Tone Multi-Frequency Overdial
Dual-Tone Multi-Frequency (DTMF) overdial is the ability to enter digits on the MS
keypad and to transmit the standardized pulse tone across the network to a remote
device. This ability to send tone is used to control automated calling system menus
and provide enhanced functionality to the MS. Once the interconnect call is
established, keypad input from the MS is converted to DTMF by the MSC. The type
and number of digits that can be sent is determined by the dialing plan of the
implementation of the MSC (International or NADP).
Call Restrictions
Call Restrictions are provisioning attributes that allow the provider to configure an
individual MS. These configuration settings include but are not limited to:
• No Interconnect Service
• Answer-only
• No-long distance
Emergency Call
The iDEN system provides facilities to locally defined Emergency Call processing.
The U.S.A. Domestic 911 and similar connections to the municipal emergency
services is available. The system provides the ability to establish a municipal 911
call by service location area. Local requirements to locate the MS within the
municipal area are provided but are limited to the potential serving cells area.
Call Detail Records
The Interconnect call activity will always be collected for capacity and billing
purposes. The MSC call record data collection conforms with U.S.A. domestic and
international standards. This call record information may be available to the ADC
through a direct network link or may be reduced to tape for loading onto the ADC.
Channel Efficiency
The way the internal iDEN network handles interconnect calls is determined by how
often a digital voice packet is applied (interleaved) on the radio link. The iDEN
system uses two methods
• 6:1 interleaved
• 3:1 interleaved
The method of interleaving used affects the voice quality, throughput and network
optimization and the amount of equipment required. Capacity planning and RF
optimization are affected by the type of interleaving used. Both types of interleaving
may be used on the iDEN system. The type of interleaving is selected by market
area during the capacity planning/system engineering phase of the implementation.
The impact of interleaving is discussed in the iDEN RF Planning Guide.