Nortel Networks NN43001-121 manual Telephony Gateway and Services planning

Telephony Gateway and Services planning 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 151).

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 In 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 Communication Server 1000

Nortel Converged Office Fundamentals — Microsoft Office Communications Server 2007

NN43001-121 01.03 Standard

Release 5.0 30 April 2008

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