Multitech VoIP User's Guide download pdf (Page 12)

MultiVOIP also utilizes Bad Frame Interpolation to increase voice quality by making the voice

transmission more robust in bursty error environments. It interpolates lost/corrupted packets by using

the previously received voice frames. Interpolation of one or two voice packets will not cause a noticeable

degradation in voice quality. Typically, Bad Frame Interpolation is invoked if Forward Error Correction

cannot recover the lost/corrupted packets. By utilizing both Forward Error Correction and Bad Frame

Interpolation, MultiVOIP is continually optimizing voice quality regardless of the conditions.

Security

“Will adding Voice over IP affect the security of my existing data network?”

On a private network, security is not an issue because the network is private to outside intruders. If

the VOIP connection is over the Internet, or through a VPN connection, the network security will not

change. MultiVOIP does not interfere or change the way the current data security is set up.

Standards

“Will the MultiVOIP gateway talk to other VOIP solutions?”

At the application level, standards for Voice over IP interoperability are still evolving. The H.323

standard is the one most widely deployed and is the only approved protocol adopted by the International

Telecommunications Union (ITU). It is an umbrella standard that speci es the components, protocols

and procedures providing multimedia communication over packet-based networks.

Another emerging standard, developed by the Internet Engineering Task Force (IETF), is the Session

Initiation Protocol (SIP). This protocol, designed speci cally for VOIP applications, is gaining popularity

in the area of IP phones and soft phones (MS Messenger) because of its simplicity.

MultiVOIP utilizes both the H.323 and SIP protocols to provide complete interoperability with other

Internet telephony solutions. The inbound IP call protocol is automatically detected and the voice

channel is dynamically con gured to match. The outbound IP call protocol is con gured with the phone

number allowing you the  exibility to call H.323 or SIP devices from the same port.

Reliability

“Can you assure me MultiVOIP is going to work all of the time?”

Telecommunications managers have been accustomed to delivering a 99.999% reliable service. Because

the MultiVOIP gateway works with the existing phone system, there is little risk in deployment. If

the data network should go down, or if all the VOIP channels were busy, the user can always revert

automatically or manually to the standard PSTN to make the call.

“What happens if my LAN/WAN goes down?”

MultiVOIP utilizes a feature called PSTN fail-over that allows it to automatically route calls over the

PSTN network when the IP network is congested or completely down. This feature heightens reliability

and augments QoS when conditions threaten to undermine voice quality. Utilizing user de nable

controls, MultiVOIP continually checks if the LAN/WAN is threatened by packet loss, jitter or latency,

or to see if the network is completely down. If it detects a problem, MultiVOIP switches to “survivability

mode” transparently routing all calls over PSTN lines connected to the MultiVOIP gateway. MultiVOIP

continues to monitor the connection and automatically switches back to the LAN/WAN once the

conditions improve.

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Multitech VoIP User's Guide Page 12