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Overview MultiVOIP User Guide
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H. 323, SIP, & SPP. Being H.323 compatible, the MVP3010 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 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 MultiVOIP3010 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 MVP3010 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 E1
connection to the MultiVOIP provides 30 time-slot channels to connect to the
telco or to serve phone or fax stations connected to a PBX.
Ports. The MVP3010 also has a 10/100 Mbps Ethernet LAN interface, and a
Command port for configuration. An MVP3010 upgraded with the MVP30-60
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.