Walking Class Of Service - Samsung OfficeServ 7200 General Description Manual

Voice Over Internet Protocol (VoIP)
The OfficeServ 7200 system is VoIP enabled and as such supports the following VoIP services:
1) H.323 Trunking to another H.323 Gateway.
2) SIP IP Trunking to another gateway.
3) IP Telephone Sets: OfficeServ SMT-i Series, ITP-5100 Series, and OfficeServ Softphone.
These IP Keysets can be installed in the local office or in a remote office, home office with full feature
operation.
4) IP Networking: Connect up to 99 systems together over a managed IP network.
5) SIP Video Phone (H.264).
The OfficeServ 7200 Media Gateway Interface (MGI-16) cards provides sixteen voice calls per card over an IP
network connection. The MGI-16 cards fit into any universal OfficeServ 7200 card slot.
With VoIP certain compression standards have also been adopted to represent each second of voice with an
amount of bandwidth. The OfficeServ 7200 MGI-16 utilizes G.711, G.729, G.729A or G.723 standards voice
compression codec's. 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 compres-
sion method for each call setup. There is also a certain amount of frame/packet overhead in each compres-
sion 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 manner with minimal delay.
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 LAN—See Section 2.4.6
4.34