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MultiVOIP User Guide Overview
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H.323, SIP & SPP. Being H.323 compatible, the MVP-2400/2410 can place
calls to telephone equipment at remote IP network locations that also contain
H.323 compatible voice-over-IP gateways. It will interface with H.323
software and H.323 gatekeeper units. H.323 specifications also bring to voip
telephony many special features common to conventional telephony. H.323
features of this kind that have been implemented into the MultiVOIP include
Call Hold, Call Waiting, Call Name Identification, Call Forwarding (from the
H.450 standard), and Call Transfer (H.450.2 from H.323 Version 2). The
fourth version of the H.323 standard improves system resource usage (esp.
logical port or socket usage) by handling call signaling more compactly and
allowing use of the low-overhead UDP protocol instead of the error-correcting
TCP protocol where possible.
The MultiVOIP is also SIP-compatible. (“SIP” means Session Initiation
Protocol.) However, H.450 Supplementary Services features can be used under
H.323 only and not under SIP.
SPP (Single-Port Protocol) is a non-standard protocol developed by Multi-
Tech. SPP is not compatible with the “Proprietary” protocol used in Multi-
Tech’s earlier generation of voip gateways. SPP offers advantages in certain
situations, especially when firewalls are used and when dynamic IP address
assignment is needed. However, when SPP is used, certain features of SIP and
H.323 will not be available and SPP will not inter-operate with voip systems
using H.323 or SIP.
Data Compression & Quality of Service. The MultiVOIP2400/2410 comes
equipped with a variety of data compression capabilities, including G.723,
G.729, and G.711 and features DiffServ quality-of-service (QoS) capabilities.
VOIP Functions. The MultiVOIP MVP-2400/2410 gateway performs four
basic functions: (a) it converts a dialed number into an IP address, (b) it sends
voice over the data network, (c) it establishes a connection with another VOIP
gateway at a remote site, and (d) it receives voice over the data network. Voice
is handled as IP packets with a variety of compression options. Each T1
connection to the MultiVOIP provides 24 time-slot channels to connect to the
telco or to serve phone or fax stations connected to a PBX.
Ports. The MVP2400 and MVP2410 each have one 10/100 Mbps Ethernet
LAN interface and one Command port for configuration. An MVP2410
upgraded with the MVP24-48 kit will have two Ethernet LAN interfaces and
two Command ports.
PSTN Failover Feature. The MultiVOIP can be programmed to divert calls
to the PSTN temporarily in case the IP network fails.
Gatekeeper. T1 voip systems can have gatekeeper functionality either by
adding, as an endpoint, either a Multi-Tech standalone gatekeeper (special
software residing in separate hardware), or an analog gateway with embedded
gatekeeper functionality (MVP210G, MVP410G, or MVP810G). Gatekeepers
are optional but useful within voip systems. The gatekeeper acts as the