IP Office - Job Aid VCM & Data Channels Summary This document gives an overview of VCM and Data channels. It covers when these are used and the capacity of different systems. 005 Issue 5 (10th October 2003)
VCM & Data Channels Overview of Channels Overview of Channels The IP Office can be treated as having a telephony switching interface (its TDM bus) and a data networking interface (its Packet bus). 20 Series Phones 4400, 6400 Series Phones Analogue Phones T1/PRI, E1, Analogue ISDN Terminal DT DS POT Line S 0 Tone Generator MOH Conference Chip TDM Bus IP Office Packet Bus LAN WAN IP Soft Phones IP Hard Phones WAN The TDM bus is used by devices attached to the system's DS, DT and POT ports (ie. analogue and digital telephones) and by any Line Modules installed in the Control Unit. It is also used by several internal devices, eg. the Tone Generator, MOH and Conference Chip. The Packet bus Interface is used by devices attached to the system's LAN and WAN ports. Calls between the two buses will use up the IP Office's available data and VCM channel resources as follows: When a voice call takes place between a device on the TDM bus and a device on the packet bus, a VCM channel is used. If no VCM channel is available then busy is indicated to the caller. On IP Office 401, 403, 406 and 412 Control Units, VCM channels are provided by installing a Voice Compression Module. On IP Office Avaya IP Office - Small Office Edition control units, VCM channels are preinstalled. The number of VCM channels supportable will depend on the Avaya IP Office - Small Office Edition control unit variant. When any data call takes place between a device on the TDM bus and a device on the packet bus, a data channel is used. If no data channel is available then the call cannot be initiated. VCM & Data Channels Page 2
VCM Examples VCM Examples In the examples below IP Phone means both IP Hard Phones and IP Soft Phones. Non-IP Phones means both analogue and digital phones. IP Phone to/from Non-IP Phone: 1 channel used for duration of call. IP Phone to/from IP Phone: 1 channel used during call setup. Access to the Tone Generator on the TDM bus is required during call setup. Thus a VCM channel is used. Once the call is connected the VCM channel is no longer used (being IP telephony devices the IP phones perform their own voice compression). Non-IP Phone to/from PSTN: No channel used. IP Phone to/from PSTN Line: 1 channel used for duration of call. Conference Calls: 1 channel per IP phone. Conference calls are managed on the TDM bus. Therefore a VCM channel is required for each device on the Packet bus involved in the conference. Data Channel Examples The following scenarios all use data channels: Multiple LAN Users dialing the Same ISP: 1 channel total. The calls are routed via the same digital trunk (assuming sufficient bandwidth) so only one data channel is used between the Packet bus and the TDM bus. Remote Access Users: 1 channel per user. Each RAS user dialing into the IP Office will use a separate trunk and thus each RAS user requires a data channel. Note: The number of Analogue RAS users is also limited by the Modem capacity of the IP Office Control Unit. Currently this is 2 if a Modem 2 module is fitted (not supported on IP401). Access to Voicemail: 1 channel per user. Each call to an IP Office Voicemail Server uses a data channel. VCM & Data Channels Page 3
VCM Channels Supported VCM Channels Supported IP401/403/406/412 Control Units These control units support VCM channels by the installation of Voice Compression Modules into the control unit. VCM Modules are available in 5, 10, 20 and 30 channel variants. The IP401, IP403 and IP406 Control Units can each support a single VCM as shown below. The IP412 can support two VCM modules. VCM Channels IP401 IP403 IP406 IP412 VCM 5 Yes Yes Yes Yes VCM 10 Yes Yes Yes VCM 20 Yes Yes Yes VCM 30 Yes Maximum VCM Channels 2 20 30 60 Avaya IP Office - Small Office Edition Control Unit Avaya IP Office - Small Office Edition control units are manufactured with VCM channels on the unit's base board. Avaya IP Office - Small Office Edition base board variants exist, with between 0 and 16 VCM channels. The number of VCM channels supportable in any individual unit can is shown on the label on the unit's base (eg. VC16 for 16 channels) or through the Monitor application. Data Channels Supported Each IP Office Control Unit supports the following number of data channels. Note that the number of those data channels that can be used for voicemail is further restricted Data Channels IP401 Avaya IP Office - Small Office Edition IP403 IP406 IP412 Maximum Data Channels 2 18 18 24 100 - Usable for Voicemail Lite 2 4 4 4 4 - Usable for Voicemail Pro (Requires licenses for number of voicemail ports available) 2 10 10 20 30 VCM & Data Channels Page 4
Detecting the VCM Module Fitted Detecting the VCM Module Fitted The presence of a VCM module is not shown in the IP Office Control Unit's configuration when opened in the Manager application. However the Monitor application does provide indication of the number of VCM channels installed in a Control Unit. 1. Start Monitor. If necessary use File Select Unit to indicate the IP Office Control Unit which you want to monitor. 2. Amongst the first lines of monitor output should be two lines similar to the following: LAW=A, PRI=0, BRI=4, ALOG=4, ADSL=0 VCOMP=5, MDM=2, WAN=1, MODU=0 LANM=1 CkSRC=8 VMAIL=1(VER=2) CALLS=0(TOT=8) 3. This line provide information about various aspect of the control unit, as follows: PRI = Number of PRI channels BRI = Number of BRI channels (4=1 card, 8=2 cards). ALOG = Number of Analogue Trunks Channels ADSL = Number of ADSL channels. VCOMP = Number of VCM channels installed. On Avaya IP Office - Small Office Edition system's this is the number of VCM channels built-in but not necessary the number of VCM channels licensed. MDM = Size of Modem Card Fitted WAN = Number of WAN configured. MODU = Number of TDM units attached (i.e. POTS, DT units etc.) LANM = Number of LAN Modules attached (i.e. WAN3s) CkSRC = Current Clock Source (ISDN port number - 0 = NO Clock Source) VMAIL = 1 if connected, 0 if not (VER is the s/w version of the Vmail Server) CALLS = Number of current calls (TOT - total number of calls made to date since last PBX reboot.) VCM & Data Channels Page 5
Voicemail Voicemail Access to voicemail and whether this requires VCM or data channels depends upon the type of voicemail system being used. This section only covers dedicated IP Office Voicemail servers. Embedded Voicemail (IP401 and Avaya IP Office - Small Office Edition) Integrated Voicemail is implemented using VCM channels plus a Smart Media card for prompt and memory storage. Voicemail Lite & Voicemail Pro The Voicemail Server PC is physically attached to the IP Office via a LAN port. However all devices on the system see the Voicemail Server as if it is a device on the TDM bus. This means: For non-ip phones, no VCM channels are used. For each IP phone calling voicemail, a VCM channel is used. Each voicemail user uses a data channel. Centralized Voicemail Pro In this solution the IP Office systems are connected by VoIP trunks. Calls to voicemail from the remote IP Office require a VCM channel on both the remote and central IP Office systems. Calls from remote IP Office IP extensions require a VCM channel on the remote system only during call setup. They require a VCM channel on the central system for the whole call. AUDIX INTUITY Centralized Voicemail This solution can be connected either via a PRI connection or via an H.323 IP connection. If using a PRI connection, the number of available VCM channels limits the number of calls between IP Office IP extensions and the central PBX. If using an H.323 connection, the number of available VCM channels limits the number of simultaneous calls between IP Office non-ip extensions and the central PBX. IP Office IP extensions only require a VCM channel during call setup. VCM & Data Channels Page 6
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Voicemail Performance figures and data quoted in this document are typical, and must be specifically confirmed in writing by Avaya before they become applicable to any particular order or contract. The company reserves the right to make alterations or amendments to the detailed specifications at its discretion. The publication of information in this document does not imply freedom from patent or other protective rights of Avaya or others. Intellectual property related to this product (including trademarks) and registered to Lucent Technologies have been transferred or licensed to Avaya. All trademarks identified by the or are registered trademarks or trademarks, respectively, of Avaya Inc. All other trademarks are the property of their respective owners. This document contains proprietary information of Avaya and is not to be disclosed or used except in accordance with applicable agreements. Any comments or suggestions regarding this document should be sent to "wgctechpubs@avaya.com". 2003 Avaya Inc. All rights reserved. Avaya Sterling Court 15-21 Mundells Welwyn Garden City Hertfordshire AL7 1LZ England Tel: +44 (0) 1707 392200 Fax: +44 (0) 1707 376933 Email: contact@avaya.com Web: http://www.avaya.com VCM & Data Channels Page 8