Walking Class Of Service - Samsung OfficeServ 500 General Description Manual

These IP Keysets can be installed in the local office or in a remote office, home office with full feature
operation.
3) IP Networking: Connect up to 15 systems together over a managed IP network.
The OfficeServ 500 Media Gateway Interface (MGI) cards support up to sixteen voice calls per card over an IP
network connection using the industry standards based H.323 or SIP protocol.The MGI cards fit into any uni-
versal OfficeServ 500 card slot. The OfficeServ 500 supports a maximum of five MGI cards per cabinet.
VoIP is transported by the OfficeServ 500 MGI cards by utilizing the ITU standards based or H.323 or SIP pro-
tocol.This standard addresses the means of transferring voice, data, and images through IP (Internet Protocol)
networks.
With VoIP certain compression standards have also been adopted to represent each second of voice with an
amount of bandwidth. The OfficeServ 500 MGI3 utilizes G.711, G.729, G.729A or G.723 standards voice com-
pression codec's while the MGI2 supports G711, and G729A only. This allows for a selectable 64kbps (G711),
8Kbps (G729A) or 6.3Kbps (G723) bandwidth use when preparing voice compression for IP transport.
Compression is used to reduce the digitized voice into a smaller bandwidth that can be carried in smaller
packets. The VoIP gateway determines the compression method for each call setup. There is also a certain
amount of frame/packet overhead in each compression channel. 64K of bandwidth can support 6~7 calls
simultaneously. This can vary depending on efficiency features like Silence Suppression and multiframe
counts. Unlike switched networks, VoIP connections consist of a sequence of numbered data packets. Since
voice conversation is usually considered "real time" these packets need to be delivered in a consistent man-
ner with minimal delay. This can be controlled via a Gatekeeper which tracks and monitors voice packets.
Gatekeepers are part of the H.323 standard but are not required. The OfficeServ 500 MGI cards are
Gatekeeper compliant.
In any Ethernet environment, packet transfers are subject to delays and/or loss. If these delays are greater
than 200ms the voice quality will deteriorate. The Ethernet data traffic and network topology should be a
consideration when using VoIP. Network congestion will affect call quality in any VoIP application.

WALKING CLASS OF SERVICE

This feature allows users to make calls or use features from a station that is restricted. The users may either
use the WCOS feature code or the authorization code feature. Both methods change the class of service to
correspond with the station passcode or authorization code that is dialed. After the call is completed, the sta-
tion returns to its programmed class of service.
WIRELESS HANDSET—See Mobility Solution
4.29