NEC Univerge SV9100 Manual page 325

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Voice over IP (NECi SIP, SIP stations, SIP trunks) requires DSP resources to be able

to convert from TDM

TDM signal and convert to Realtime Transport Protocol (RTP) for transmission as

VoIP, and vice versa. Each IP to TDM conversion requires a DSP resource.

DSP resources are provided by the GPZ-IPLE It can be difficult to work out how

many DSP resources are required in an UNIVERGE SV9100 system, because:

GPZ-IPLE IP Addressing

The GPZ-IPLE requires two IP Addresses, one for Signaling (PRG 10-12-09), and

one for the DSP Resources (PRG 84-26-01).

The following chart shows the minimum and maximum number of IP addresses used

with different GPZ-IPLE card configurations.

TDM = Time Division Multiplexing - traditional circuit-based telephony

SV9100 Networking Manual

to IP technologies. DSPs (Digital Signal Processors) take a

not all IP Extensions/trunks are used at the same time

peer-to-peer calls do not use a DSP resource

When assigning the IP addresses to the GPZ-IPLE card, they must be in the same network

(subnet). If the CPU will be connected to the network it requires a separate IP address in a

different network (subnet). When an GPZ-IPLE card is attached to the CPU, using the CPU

NIC is no longer required. All connections that previously terminated to the CPU NIC card

can now be terminated to the GPZ-IPLE NIC. For example, PC PRO, Web Pro, and ACD all

terminate to the GPZ-IPLE NIC card when installed. Both the GPZ-IPLE and CPU NIC

share the same gateway assignment. The default gateway command in Program 10-12-03 is

used by both NICs, allowing only one device, GPZ-IPLE or CPU, to route outside of its own

The number of DSP channels

depends on the VOIP license

loaded to GCD-CP10 up to 256.