Nortel Networks NN43001-321

16 Converged Desktop Services

When a call terminates to the CS 1000 telephone, the CDMV or CDMO

Class of Service redirects the call to the CSDN deﬁned on the telephone,

before ringing the CS 1000 telephone. The CSDN is a CDN used for CDS.

This CDN number is also conﬁgured on the Signaling Server so that it can

be acquired by the CDS application when the Signaling Server starts.

When the call terminates to the CDN a message is sent over AML/VASto

the CDS as notiﬁcation of the incoming call. If the call is a vir tual trunk

call, and queued on a CDN, a Digital Signal Processor (DSP) resource is

used to play the ringback to the caller because CDN is a TDM resource. (A

DSP resource is required to handle media between a TDM resource and

an IP resource.) The CDS cannot determine where the call ter minates,

either on the CS 1000 telephone or in the SIP network; the termination

location is based on the user’s Advanced Screening options in the MCS

5100 Client. Therefore, the CDS instructs the Call Server to make a Virtual

Trunkcall to a predeter mined number,as deﬁned on the Signaling Server

(the Service DN used for making a VTRK call from an Agent) and the CS

1000 dialing plan. This call reserves a Virtual Trunk in case it is required to

terminate the call to a SIP device (if so conﬁgured in the user’s Advanced

Screening options). After the Virtual Trunk call is established, CDS sends a

SIP INVITE message to the MCS 5100 using the SIPGateway Application.

The MCS 5100 receives the INVITE message and processes it on the

user’s PC Client. The user’s Advanced Screening options are checked for

any rules that determine the destination. If no rules exist and the user is

in Converged Mode, the MCS 5100 notiﬁes the CDS application to notify

the converged telephone. The CDS bridges the call and the Virtual Trunkis

dropped. An MCS 5100 call notiﬁcation screen-pop appears, and the CS

1000 telephone rings. The call is answered on the CS 1000 telephone and

call logs are generated on the MCS 5100 PC Client. If the caller is another

SIP device or Converged Desktop user,all MCS 5100 features become

available forthe call.

For outbound calls, the user may use their MCS client in a Click-to-Call

scenario or use the keypad of their CS 1000 telephone. When using the

MCS 5100 Client, the user has access to all directories available and can

process a call. When the user selects a directory entry or dials a telephone

number, the MCS 5100 sends an INVITE message to the CS 1000, and

CDS processes the call to the CS 1000 telephone. The telephone must be

answered beforeCDS can process the second leg of the call. When the call

is answered at the CS 1000 telephone, the destinationcalled and the two

calls are bridged together. The PCA application is used for making these

calls. The MCS 5100 Client activates call logs. If the destination is another

SIP device, the MCS 5100 Client allows multimedia features.

Nortel Communication Server 1000

Communication Server 1000 to MCS 5100 ConvergedDesktop Type 2 Conﬁguration Guide

NN43001-321 01.05 Standard

Release 5.0 15 February 2008