Nortel 1000 Fundamentals page 71

VoIP calls can only be placed to other Office Communicator users (computer
to computer calls). Outgoing VoIP calls to telephone numbers for Microsoft
Office Communicator Mobile are not supported.
Microsoft Virtual Server 2005 Microsoft Virtual Server 2005 is not
supported as part of Nortel Converged Office.
DTMF CS 1000 supports in-band DTMF digits and out-of-band DTMF
digits for SIP calls through RFC2833. RFC2833 is an out-of-band
mechanism for DTMF signaling. DTMF digit handling using RFC2833
enables Nortel CS 1000 products to work with other SIP products that
support out-of-band DTMF signaling.
With RFC2833, a key press on a telephone translates to a signaling packet
(or packets) that flow with the VoIP stream to the far end. These signaling
packets are RFC packets which contain the DTMF key that was pressed.
The same principle applies to TDM devices that are involved in a VoIP call.
The Voice Gateway (VGW) TN that converts the TDM stream to VoIP also
detects a tone on the TDM side and translates it to RFC2833 packets on the
VoIP side. The VGW TN can receive an RFC2833 packet on the VoIP side
and generates a tone on the TDM side.
Configure the correct Loss Values for in-band DTMF. For more information
about configuring the CS 1000 to support in-band DTMF tones, see
"Configuring the Call Server" (page
2050 Soft phones Due to RFC2833 not being supported, 2050 soft
phones are not recommended to be deployed in a network with OCS 2007
components.
ITG-Pentium cards ITG-Pentium cards are not supported (regardless of
load) due to RFC2833 not being supported.
Multimedia Communicator Server MeetMe Conference support
Release 5.0, there are no limitations for Office Communicator calls to the
Multimedia Communicator Server (MCS) MeetMe bridge provided that all
tandem nodes run Release 5.0 software.
Codecs G.711 A/MU law is supported for the Mediation Server. The
G.711 codec must use a 20-ms payload at this time, due to the Microsoft
Office limitation. The Mediation Server does not support G.723 and G.729.
Video support Office Communicator video is supported for Remote Call
Control between two Office Communicator clients and VoIP calls directly
between two OC clients without going through the Mediation Server. Office
Communicator video is not supported if one of the clients goes through
the Mediation Server.
Nortel Converged Office Fundamentals — Microsoft Office Communications Server 2007
Copyright © 2005–2008, Nortel Networks
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Telephony Gateway and Services planning 71
Nortel Communication Server 1000
NN43001-121 01.03 Standard
Release 5.0 30 April 2008
151).
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